: материалы временных коллективов / Y. Matsuura, A. P. Abaimov // Proceedings of the eighth symposium on the joint Siberian permafrost studies between Japan and Russia in 1999. - Onogawa : National Institute for Environmental Studies, 2000. - С. 129-134. - Библиогр. в конце ст.
Аннотация: Our results of net N mineralization rates in TEF, continuous permafrost region, were much lower than those in boreal forest and arctic tundra.
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Abaimov, Anatoly Platonovich ; Абаимов Анатолий Платонович; Матсуура У.
Труды сотрудников ИЛ им. В.Н. Сукачева СО РАН
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Найдено документов в текущей БД: 101
Nitrogen miniralization in larch forest soils of continuous permafrost region, Central Siberia - an implication for nitrogen economy of larch forest stand
Evidence of evergreen conifers invasion into larch dominated forests during recent decades
: материалы временных коллективов / V. I. Kharuk, K. J. Ranson, M. L. Dvinskaya // Environmental change in Siberia: earth observation, field studies and modelling. - Dordrecht et. al. : Springer, 2010. - С. 53-65. - Библиогр. в конце ст.
Аннотация: The results obtained indicate a DNC and birch invasion into a traditional larch domination zone, and the connection of this phenomenon with climatic trends during last decades. On the western and southern margions DNC regeneration formed a second layer in the forest canopies, which could eventually replace the larch in the overstory. Larch as a species also responds to climatic trends: its radial increment significantly increased during last 3 decades, and this increase correlates with summer temperatures and precipitation. The other larch response is the migration into the trundra zone and a crown closure increase, as was found on the key-sites "Polar Ural"and "Ary-Mas". The resulting effect of this process may be that larch could reach the Arctic shore, a phenomenon that has happened in a former epoch, whereas the traditional area of larch dominance will turn to mixed taiga forest.
Полный текст
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок, 50/28
Доп.точки доступа:
Ranson, K.J.; Рэнсон К.Дж.; Dvinskaya, Mariya Leonidovna; Двинская, Мария Леонидовна; Харук, Вячеслав Иванович
Аннотация: The results obtained indicate a DNC and birch invasion into a traditional larch domination zone, and the connection of this phenomenon with climatic trends during last decades. On the western and southern margions DNC regeneration formed a second layer in the forest canopies, which could eventually replace the larch in the overstory. Larch as a species also responds to climatic trends: its radial increment significantly increased during last 3 decades, and this increase correlates with summer temperatures and precipitation. The other larch response is the migration into the trundra zone and a crown closure increase, as was found on the key-sites "Polar Ural"and "Ary-Mas". The resulting effect of this process may be that larch could reach the Arctic shore, a phenomenon that has happened in a former epoch, whereas the traditional area of larch dominance will turn to mixed taiga forest.
Полный текст
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок, 50/28
Доп.точки доступа:
Ranson, K.J.; Рэнсон К.Дж.; Dvinskaya, Mariya Leonidovna; Двинская, Мария Леонидовна; Харук, Вячеслав Иванович
The potential impact of CO2 and air temperature increases on krummholz transformation into arborescent form in the southern Siberian Mountains
: материалы временных коллективов / V. I. Kharuk, M. Dvinskaya, S.T. Im, K. Ranson // Arctic, Antarctic and Alpine Research. - 2011. - Vol. 43, № 4. - С. 593-600. - Библиогр. в конце ст.
Аннотация: Trees in the southern Siberian Mountains forest-tundra ecotone have considerably increased their radial and apical growth increments during the last few decades. This leads to the widespread vertical transformation of mat and prostrate krummholz forms of larch (Larix sibirica Ledeb) and Siberian pine (Pinus sibirica Du Tour). An analysis of the radial growth increments showed that these transformations began in the mid-1980s. Larch showed a greater resistance to the harsh alpine environment and attained a vertical growth form in areas where Siberian pine is still krummholz and etc.
Scopus,
WOS
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Ranson, K.J.; Рэнсон К.Дж.; Dvinskaya, Mariya Leonidovna; Двинская, Мария Леонидовна; Im, Sergey Tkhekdyeyevich; Им, Сергей Тхекдеевич; Харук, Вячеслав Иванович
Имеются экземпляры в отделах:
ЧЗ (05.03.2008г. (1 экз.) - Б.ц.) - свободны 1
Аннотация: Trees in the southern Siberian Mountains forest-tundra ecotone have considerably increased their radial and apical growth increments during the last few decades. This leads to the widespread vertical transformation of mat and prostrate krummholz forms of larch (Larix sibirica Ledeb) and Siberian pine (Pinus sibirica Du Tour). An analysis of the radial growth increments showed that these transformations began in the mid-1980s. Larch showed a greater resistance to the harsh alpine environment and attained a vertical growth form in areas where Siberian pine is still krummholz and etc.
Scopus,
WOS
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Ranson, K.J.; Рэнсон К.Дж.; Dvinskaya, Mariya Leonidovna; Двинская, Мария Леонидовна; Im, Sergey Tkhekdyeyevich; Им, Сергей Тхекдеевич; Харук, Вячеслав Иванович
Имеются экземпляры в отделах:
ЧЗ (05.03.2008г. (1 экз.) - Б.ц.) - свободны 1
Tracing the origin of Arctic driftwood
/ L. . Hellmann [et al.] // J. Geophys. Res.-Biogeosci. - 2013. - Vol. 118, Is. 1. - P68-76, DOI 10.1002/jgrg.20022. - Cited References: 76. - B. Sittler, B. Frauenberger, C. Lachenmeier, I. Pike, A. Verstege, D. Nievergelt, H. Linderson, and B. Held contributed to field and laboratory work. A. Bast and C. Ginzler provided insight on various mapping techniques. G. King and two anonymous reviewers commented on earlier manuscript versions. This work is supported by the Eva Mayr-Stihl Foundation.
. - 9. - ISSN 0148-0227
РУБ Environmental Sciences + Geosciences, Multidisciplinary
Аннотация: Arctic environments, where surface temperatures increase and sea ice cover and permafrost depth decrease, are very sensitive to even slight climatic variations. Placing recent environmental change of the high-northern latitudes in a long-term context is, however, complicated by too short meteorological observations and too few proxy records. Driftwood may represent a unique cross-disciplinary archive at the interface of marine and terrestrial processes. Here, we introduce 1445 driftwood remains from coastal East Greenland and Svalbard. Macroscopy and microscopy were applied for wood anatomical classification; a multi-species subset was used for detecting fungi; and information on boreal vegetation patterns, circumpolar river systems, and ocean current dynamics was reviewed and evaluated. Four conifer (Pinus, Larix, Picea, and Abies) and three deciduous (Populus, Salix, and Betula) genera were differentiated. Species-specific identification also separated Pinus sylvestris and Pinus sibirica, which account for similar to 40% of all driftwood and predominantly originate from western and central Siberia. Larch and spruce from Siberia or North America represents similar to 26% and similar to 18% of all materials, respectively. Fungal colonization caused different levels of driftwood staining and/or decay. Our results demonstrate the importance of combining wood anatomical knowledge with insight on boreal forest composition for successfully tracing the origin of Arctic driftwood. To ultimately reconstruct spatiotemporal variations in ocean currents, and to better quantify postglacial uplift rates, we recommend consideration of dendrochronologically dated material from many more circumpolar sites. Citation: Hellmann, L., W. Tegel, O. Eggertsson, F. H. Schweingruber, R. Blanchette, A. Kirdyanov, H. Gartner, and U. Buntgen (2013), Tracing the origin of Arctic driftwood, J. Geophys. Res. Biogeosci., 118, 68-76, doi:10.1002/jgrg.20022.
WOS,
Scopus,
Полный текст
Держатели документа:
[Hellmann, Lena
Schweingruber, Fritz Hans
Gaertner, Holger
Buentgen, Ulf] Swiss Fed Res Inst, WSL, CH-8903 Birmensdorf, Switzerland
[Hellmann, Lena
Buentgen, Ulf] Oeschger Ctr Climate Change Res, Bern, Switzerland
[Tegel, Willy] Univ Freiburg, Inst Forest Growth IWW, D-79106 Freiburg, Germany
[Eggertsson, Olafur] Iceland Forest Serv, Reykjavik, Iceland
[Blanchette, Robert] Univ Minnesota, Dept Plant Pathol, St Paul, MN USA
[Kirdyanov, Alexander] VN Sukachev Inst Forest SB RAS, Krasnoyarsk, Russia
Доп.точки доступа:
Hellmann, L...; Tegel, W...; Eggertsson, O...; Schweingruber, F.H.; Blanchette, R...; Kirdyanov, A...; Gartner, H...; Buntgen, U...
Рубрики:
SUMMER TEMPERATURE-VARIATIONS
MACKENZIE RIVER DRIFTWOOD
SEA-ICE
FUNGAL DIVERSITY
CLIMATE-CHANGE
BARENTS SEA
SVALBARD
ISLAND
WOOD
DETERIORATION
SUMMER TEMPERATURE-VARIATIONS
MACKENZIE RIVER DRIFTWOOD
SEA-ICE
FUNGAL DIVERSITY
CLIMATE-CHANGE
BARENTS SEA
SVALBARD
ISLAND
WOOD
DETERIORATION
Аннотация: Arctic environments, where surface temperatures increase and sea ice cover and permafrost depth decrease, are very sensitive to even slight climatic variations. Placing recent environmental change of the high-northern latitudes in a long-term context is, however, complicated by too short meteorological observations and too few proxy records. Driftwood may represent a unique cross-disciplinary archive at the interface of marine and terrestrial processes. Here, we introduce 1445 driftwood remains from coastal East Greenland and Svalbard. Macroscopy and microscopy were applied for wood anatomical classification; a multi-species subset was used for detecting fungi; and information on boreal vegetation patterns, circumpolar river systems, and ocean current dynamics was reviewed and evaluated. Four conifer (Pinus, Larix, Picea, and Abies) and three deciduous (Populus, Salix, and Betula) genera were differentiated. Species-specific identification also separated Pinus sylvestris and Pinus sibirica, which account for similar to 40% of all driftwood and predominantly originate from western and central Siberia. Larch and spruce from Siberia or North America represents similar to 26% and similar to 18% of all materials, respectively. Fungal colonization caused different levels of driftwood staining and/or decay. Our results demonstrate the importance of combining wood anatomical knowledge with insight on boreal forest composition for successfully tracing the origin of Arctic driftwood. To ultimately reconstruct spatiotemporal variations in ocean currents, and to better quantify postglacial uplift rates, we recommend consideration of dendrochronologically dated material from many more circumpolar sites. Citation: Hellmann, L., W. Tegel, O. Eggertsson, F. H. Schweingruber, R. Blanchette, A. Kirdyanov, H. Gartner, and U. Buntgen (2013), Tracing the origin of Arctic driftwood, J. Geophys. Res. Biogeosci., 118, 68-76, doi:10.1002/jgrg.20022.
WOS,
Scopus,
Полный текст
Держатели документа:
[Hellmann, Lena
Schweingruber, Fritz Hans
Gaertner, Holger
Buentgen, Ulf] Swiss Fed Res Inst, WSL, CH-8903 Birmensdorf, Switzerland
[Hellmann, Lena
Buentgen, Ulf] Oeschger Ctr Climate Change Res, Bern, Switzerland
[Tegel, Willy] Univ Freiburg, Inst Forest Growth IWW, D-79106 Freiburg, Germany
[Eggertsson, Olafur] Iceland Forest Serv, Reykjavik, Iceland
[Blanchette, Robert] Univ Minnesota, Dept Plant Pathol, St Paul, MN USA
[Kirdyanov, Alexander] VN Sukachev Inst Forest SB RAS, Krasnoyarsk, Russia
Доп.точки доступа:
Hellmann, L...; Tegel, W...; Eggertsson, O...; Schweingruber, F.H.; Blanchette, R...; Kirdyanov, A...; Gartner, H...; Buntgen, U...
Fire return intervals within the northern boundary of the larch forest in Central Siberia
/ V. I. Kharuk, M. L. Dvinskaya, K. J. Ranson // Int. J. Wildland Fire. - 2013. - Vol. 22, Is. 2. - P207-211, DOI 10.1071/WF11181. - Cited References: 28. - This research was supported by the SB RAS Program Number 27.33, and NASA Science Mission Directorate, Terrestrial Ecology Program. The authors thank Dr Joanne Howl for editing the manuscript.
. - 5. - ISSN 1049-8001
РУБ Forestry
Аннотация: A fire history of northern larch forests was studied. These larch forests are found near the northern limit of their range at similar to 71 degrees N, where fires are predominantly caused by lightning strikes rather than human activity. Fire-return intervals (FRIs) were calculated based on fire scars and dates of tree natality. Tree natality was used as an approximation of the date of the last fire. The average FRI was found to be 295 +/- 57 years, which is the longest reported for larch-dominated stands. Prior studies reported 80-90-year FRIs at 64 degrees N and similar to 200 years near the latitude of the Arctic Circle. Comparing data from fires that occurred in 1700-1849 (end of the Little Ice Age, LIA) and 1850-1999 (post-LIA warming) indicates approximately twice as many fires occurred during the latter period. This agrees with the hypothesis that observed climatic warming will result in an increase in fire frequency. Our results also indicate that fires that did not leave visible fire scars on the tree stem may be identified based on the date of growth release revealed from dendrochronology.
WOS,
Scopus
Держатели документа:
[Kharuk, Vyacheslav I.
Dvinskaya, Mariya L.] Siberian Fed Univ, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
[Ranson, K. Jon] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
Доп.точки доступа:
Kharuk, V.I.; Dvinskaya, M.L.; Ranson, K.J.
Рубрики:
BOREAL FOREST
EVERGREEN CONIFERS
CLIMATE-CHANGE
TREE-RINGS
FREQUENCY
EMISSIONS
WILDFIRE
REGIMES
Кл.слова (ненормированные):
Larix gmelinii -- wildfires
BOREAL FOREST
EVERGREEN CONIFERS
CLIMATE-CHANGE
TREE-RINGS
FREQUENCY
EMISSIONS
WILDFIRE
REGIMES
Кл.слова (ненормированные):
Larix gmelinii -- wildfires
Аннотация: A fire history of northern larch forests was studied. These larch forests are found near the northern limit of their range at similar to 71 degrees N, where fires are predominantly caused by lightning strikes rather than human activity. Fire-return intervals (FRIs) were calculated based on fire scars and dates of tree natality. Tree natality was used as an approximation of the date of the last fire. The average FRI was found to be 295 +/- 57 years, which is the longest reported for larch-dominated stands. Prior studies reported 80-90-year FRIs at 64 degrees N and similar to 200 years near the latitude of the Arctic Circle. Comparing data from fires that occurred in 1700-1849 (end of the Little Ice Age, LIA) and 1850-1999 (post-LIA warming) indicates approximately twice as many fires occurred during the latter period. This agrees with the hypothesis that observed climatic warming will result in an increase in fire frequency. Our results also indicate that fires that did not leave visible fire scars on the tree stem may be identified based on the date of growth release revealed from dendrochronology.
WOS,
Scopus
Держатели документа:
[Kharuk, Vyacheslav I.
Dvinskaya, Mariya L.] Siberian Fed Univ, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
[Ranson, K. Jon] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
Доп.точки доступа:
Kharuk, V.I.; Dvinskaya, M.L.; Ranson, K.J.
Biogeochemistry of carbon, major and trace elements in watersheds of northern Eurasia drained to the Arctic Ocean: The change of fluxes, sources and mechanisms under the climate warming prospective
/ O. S. Pokrovsky [et al.] // C. R. Geosci. - 2012. - Vol. 344, Is. 11.12.2013. - P663-677, DOI 10.1016/j.crte.2012.08.003. - Cited References: 81. - This work was supported by ANR "Arctic Metals", LIA "LEAGE", PICS No. 6063, GDRI "CAR WET SIB", grants RFBR-CNRS Nos 12-05-91055, 08-05-00312_a, 07-05-92212-CNRS_a, 08-04-92495-CNRS_a, CRDF RUG1-2980-KR10, Federal Program RF "Kadry" (contract N 14.740.11.0935), and Programs of Presidium RAS and UrORAS.
. - 15. - ISSN 1631-0713
РУБ Geosciences, Multidisciplinary
Аннотация: Warming of the permafrost accompanied by the release of ancient soil organic carbon is one of the most significant environmental threats within the global climate change scenario. While the main sites of permafrost carbon processing and its release to the atmosphere are thermokarst (thaw) lakes and ponds, the main carriers of carbon and related major and trace elements from the land to the Arctic ocean are Russian subarctic rivers. The source of carbon in these rivers is atmospheric C consumed by chemical weathering of rocks and amplified by plant uptake and litter decomposition. This multidisciplinary study describes results of more than a decade of observations and measurements of elements fluxes, stocks and mechanisms in the Russian boreal and subarctic zone, from Karelia region to the Kamchatka peninsula, along the gradient of permafrost-free terrain to continuous permafrost settings, developed on various lithology and vegetation types. We offer a comprehensive, geochemically-based view on the functioning of aquatic boreal systems which quantifies the role of the following factors on riverine element fluxes: (1) the specificity of lithological substrate; (2) the importance of organic and organo-mineral colloidal forms, notably during the snowmelt season; (3) the phenomenon of lakes seasonal overturn; (4) the role of permafrost within the small and large watersheds; and (5) the governing role of terrestrial vegetation in element mobilization from rock substrate to the river. Care of such a multiple approach, a first order prediction of the evolution of element stocks and fluxes under scenario of progressive warming in high latitudes becomes possible. It follows the increase of frozen peat thawing in western Siberia will increase the stocks of elements in surface waters by a factor of 3 to 10 whereas the increase of the thickness of active layer, the biomass and the primary productivity all over permafrost-affected zone will bring about a short-term increase of elements stocks in labile reservoir (plant litter) and riverine fluxes by a factor of 2. The change of the plant productivity and community composition under climate warming in central Siberia will be the most important factor of major and trace element fluxes increase (probably a factor of 2) from the soil to the river and, finally, to the Arctic Ocean. (c) 2012 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
Полный текст,
WOS,
Scopus
Держатели документа:
[Pokrovsky, Oleg S.
Viers, Jerome
Dupre, Bernard
Audry, Stephane] Univ Toulouse, CNRS IRD OMP, Geosci Environm Toulouse, F-31400 Toulouse, France
[Chabaux, Francois] CNRS, EOST, UMR 7517, CGS, F-67084 Strasbourg, France
[Gaillardet, Jerome] Inst Phys Globe Strasbourg Paris, Equipe Geochim Cosmochim, F-75005 Paris, France
[Prokushkin, Anatoly S.] VN Sukachev Inst Forest SB RAS, Krasnoyarsk, Russia
[Shirokova, Liudmila S.] Russian Acad Sci, Inst Ecol Problems N, Arkhangelsk, Russia
[Kirpotin, Sergey N.] Tomsk State Univ, Tomsk 634050, Russia
[Lapitsky, Sergey A.] Moscow MV Lomonosov State Univ, Geol Fac, Moscow, Russia
[Shevchenko, Vladimir P.] RAS, PP Shirshov Oceanol Inst, Moscow 117901, Russia
Доп.точки доступа:
Pokrovsky, O.S.; Viers, J...; Dupre, B...; Chabaux, F...; Gaillardet, J...; Audry, S...; Prokushkin, A.S.; Shirokova, L.S.; Kirpotin, S.N.; Lapitsky, S.A.; Shevchenko, V.P.
Рубрики:
WOLLASTONITE DISSOLUTION KINETICS
SEVERNAYA DVINA RIVER
ORGANIC-LIGANDS
WESTERN SIBERIA
HETEROTROPHIC BACTERIA
FLUVIAL GEOCHEMISTRY
COLLOIDAL PARTICLES
SOUTHWEST ICELAND
SIZE DISTRIBUTION
WEATHERING RATES
Кл.слова (ненормированные):
Arctic -- Geochemistry -- Permafrost -- Carbon -- Weathering -- Fluxes
WOLLASTONITE DISSOLUTION KINETICS
SEVERNAYA DVINA RIVER
ORGANIC-LIGANDS
WESTERN SIBERIA
HETEROTROPHIC BACTERIA
FLUVIAL GEOCHEMISTRY
COLLOIDAL PARTICLES
SOUTHWEST ICELAND
SIZE DISTRIBUTION
WEATHERING RATES
Кл.слова (ненормированные):
Arctic -- Geochemistry -- Permafrost -- Carbon -- Weathering -- Fluxes
Аннотация: Warming of the permafrost accompanied by the release of ancient soil organic carbon is one of the most significant environmental threats within the global climate change scenario. While the main sites of permafrost carbon processing and its release to the atmosphere are thermokarst (thaw) lakes and ponds, the main carriers of carbon and related major and trace elements from the land to the Arctic ocean are Russian subarctic rivers. The source of carbon in these rivers is atmospheric C consumed by chemical weathering of rocks and amplified by plant uptake and litter decomposition. This multidisciplinary study describes results of more than a decade of observations and measurements of elements fluxes, stocks and mechanisms in the Russian boreal and subarctic zone, from Karelia region to the Kamchatka peninsula, along the gradient of permafrost-free terrain to continuous permafrost settings, developed on various lithology and vegetation types. We offer a comprehensive, geochemically-based view on the functioning of aquatic boreal systems which quantifies the role of the following factors on riverine element fluxes: (1) the specificity of lithological substrate; (2) the importance of organic and organo-mineral colloidal forms, notably during the snowmelt season; (3) the phenomenon of lakes seasonal overturn; (4) the role of permafrost within the small and large watersheds; and (5) the governing role of terrestrial vegetation in element mobilization from rock substrate to the river. Care of such a multiple approach, a first order prediction of the evolution of element stocks and fluxes under scenario of progressive warming in high latitudes becomes possible. It follows the increase of frozen peat thawing in western Siberia will increase the stocks of elements in surface waters by a factor of 3 to 10 whereas the increase of the thickness of active layer, the biomass and the primary productivity all over permafrost-affected zone will bring about a short-term increase of elements stocks in labile reservoir (plant litter) and riverine fluxes by a factor of 2. The change of the plant productivity and community composition under climate warming in central Siberia will be the most important factor of major and trace element fluxes increase (probably a factor of 2) from the soil to the river and, finally, to the Arctic Ocean. (c) 2012 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
Полный текст,
WOS,
Scopus
Держатели документа:
[Pokrovsky, Oleg S.
Viers, Jerome
Dupre, Bernard
Audry, Stephane] Univ Toulouse, CNRS IRD OMP, Geosci Environm Toulouse, F-31400 Toulouse, France
[Chabaux, Francois] CNRS, EOST, UMR 7517, CGS, F-67084 Strasbourg, France
[Gaillardet, Jerome] Inst Phys Globe Strasbourg Paris, Equipe Geochim Cosmochim, F-75005 Paris, France
[Prokushkin, Anatoly S.] VN Sukachev Inst Forest SB RAS, Krasnoyarsk, Russia
[Shirokova, Liudmila S.] Russian Acad Sci, Inst Ecol Problems N, Arkhangelsk, Russia
[Kirpotin, Sergey N.] Tomsk State Univ, Tomsk 634050, Russia
[Lapitsky, Sergey A.] Moscow MV Lomonosov State Univ, Geol Fac, Moscow, Russia
[Shevchenko, Vladimir P.] RAS, PP Shirshov Oceanol Inst, Moscow 117901, Russia
Доп.точки доступа:
Pokrovsky, O.S.; Viers, J...; Dupre, B...; Chabaux, F...; Gaillardet, J...; Audry, S...; Prokushkin, A.S.; Shirokova, L.S.; Kirpotin, S.N.; Lapitsky, S.A.; Shevchenko, V.P.
Comparison and assessment of coarse resolution land cover maps for Northern Eurasia
[Text] / D. . Pflugmacher [et al.] // Remote Sens. Environ. - 2011. - Vol. 115, Is. 12. - P3539-3553, DOI 10.1016/j.rse.2011.08.016. - Cited References: 65. - The research was supported by the Land Cover/Land-Use Change Program of the National Aeronautics and Space Administration (grant numbers NNGO6GF54G and NNX09AK88G) and in part by the Asia-Pacific Network for Global Change Research and the Alexander von Humboldt Foundation. We like to thank Dr. Curtis Woodcock for his advice in the early planning of this study, and Gretchen Bracher for preparing graphs. We are also thankful for the comments of two anonymous reviewers that helped to improve this manuscript.
. - 15. - ISSN 0034-4257
РУБ Environmental Sciences + Remote Sensing + Imaging Science & Photographic Technology
Аннотация: Information on land cover at global and continental scales is critical for addressing a range of ecological, socioeconomic and policy questions. Global land cover maps have evolved rapidly in the last decade, but efforts to evaluate map uncertainties have been limited, especially in remote areas like Northern Eurasia. Northern Eurasia comprises a particularly diverse region covering a wide range of climate zones and ecosystems: from arctic deserts, tundra, boreal forest, and wetlands, to semi-arid steppes and the deserts of Central Asia. In this study, we assessed four of the most recent global land cover datasets: GLC-2000, GLOBCOVER, and the MODIS Collection 4 and Collection 5 Land Cover Product using cross-comparison analyses and Landsat-based reference maps distributed throughout the region. A consistent comparison of these maps was challenging because of disparities in class definitions, thematic detail, and spatial resolution. We found that the choice of sampling unit significantly influenced accuracy estimates, which indicates that comparisons of reported global map accuracies might be misleading. To minimize classification ambiguities, we devised a generalized legend based on dominant life form types (LFT) (tree, shrub, and herbaceous vegetation, barren land and water). LFT served as a necessary common denominator in the analyzed map legends, but significantly decreased the thematic detail. We found significant differences in the spatial representation of LFT's between global maps with high spatial agreement (above 0.8) concentrated in the forest belt of Northern Eurasia and low agreement (below 0.5) concentrated in the northern taiga-tundra zone, and the southern dry lands. Total pixel-level agreement between global maps and six test sites was moderate to fair (overall agreement: 0.67-0.74, Kappa: 0.41-0.52) and increased by 0.09-0.45 when only homogenous land cover types were analyzed. Low map accuracies at our tundra test site confirmed regional disagreements and difficulties of current global maps in accurately mapping shrub and herbaceous vegetation types at the biome borders of Northern Eurasia. In comparison, tree dominated vegetation classes in the forest belt of the region were accurately mapped, but were slightly overestimated (10%-20%), in all maps. Low agreement of global maps in the northern and southern vegetation transition zones of Northern Eurasia is likely to have important implications for global change research, as those areas are vulnerable to both climate and socio-economic changes. (C) 2011 Elsevier Inc. All rights reserved.
ELSEVIER - полный текст,
WOS,
Scopus
Держатели документа:
[Pflugmacher, Dirk
Krankina, Olga N.
Kennedy, Robert E.
Nelson, Peder] Oregon State Univ, Dept Forest Ecosyst & Soc, Corvallis, OR 97331 USA
[Cohen, Warren B.] US Forest Serv, USDA, Pacific NW Res Stn, Forestry Sci Lab, Corvallis, OR 97331 USA
[Friedl, Mark A.
Sulla-Menashe, Damien] Boston Univ, Dept Geog & Environm, Boston, MA 02215 USA
[Loboda, Tatiana V.] Univ Maryland, Dept Geog, College Pk, MD 20742 USA
[Kuemmerle, Tobias] Potsdam Inst Climate Impact Res PIK, D-14412 Potsdam, Germany
[Dyukarev, Egor] Inst Monitoring Climat & Ecol Syst, Tomsk 634021, Russia
[Elsakov, Vladimir] Russian Acad Sci, Komi Sci Ctr, Inst Biol, Syktyvkar 167610, Russia
[Kharuk, Viacheslav I.] VN Sukachev Inst Forest, Krasnoyarsk, Russia
Доп.точки доступа:
Pflugmacher, D...; Krankina, O.N.; Cohen, W.B.; Friedl, M.A.; Sulla-Menashe, D...; Kennedy, R.E.; Nelson, P...; Loboda, T.V.; Kuemmerle, T...; Dyukarev, E...; Elsakov, V...; Kharuk, V.I.
Рубрики:
ACCURACY ASSESSMENT
SATELLITE DATA
MODIS DATA
PRODUCTS
DATASETS
CARBON
CLASSIFICATION
VALIDATION
SURFACE
EARTH
Кл.слова (ненормированные):
Eurasia -- Land cover -- Global -- Validation -- GLC-2000 -- GLOBCOVER -- MODIS -- LCCS
ACCURACY ASSESSMENT
SATELLITE DATA
MODIS DATA
PRODUCTS
DATASETS
CARBON
CLASSIFICATION
VALIDATION
SURFACE
EARTH
Кл.слова (ненормированные):
Eurasia -- Land cover -- Global -- Validation -- GLC-2000 -- GLOBCOVER -- MODIS -- LCCS
Аннотация: Information on land cover at global and continental scales is critical for addressing a range of ecological, socioeconomic and policy questions. Global land cover maps have evolved rapidly in the last decade, but efforts to evaluate map uncertainties have been limited, especially in remote areas like Northern Eurasia. Northern Eurasia comprises a particularly diverse region covering a wide range of climate zones and ecosystems: from arctic deserts, tundra, boreal forest, and wetlands, to semi-arid steppes and the deserts of Central Asia. In this study, we assessed four of the most recent global land cover datasets: GLC-2000, GLOBCOVER, and the MODIS Collection 4 and Collection 5 Land Cover Product using cross-comparison analyses and Landsat-based reference maps distributed throughout the region. A consistent comparison of these maps was challenging because of disparities in class definitions, thematic detail, and spatial resolution. We found that the choice of sampling unit significantly influenced accuracy estimates, which indicates that comparisons of reported global map accuracies might be misleading. To minimize classification ambiguities, we devised a generalized legend based on dominant life form types (LFT) (tree, shrub, and herbaceous vegetation, barren land and water). LFT served as a necessary common denominator in the analyzed map legends, but significantly decreased the thematic detail. We found significant differences in the spatial representation of LFT's between global maps with high spatial agreement (above 0.8) concentrated in the forest belt of Northern Eurasia and low agreement (below 0.5) concentrated in the northern taiga-tundra zone, and the southern dry lands. Total pixel-level agreement between global maps and six test sites was moderate to fair (overall agreement: 0.67-0.74, Kappa: 0.41-0.52) and increased by 0.09-0.45 when only homogenous land cover types were analyzed. Low map accuracies at our tundra test site confirmed regional disagreements and difficulties of current global maps in accurately mapping shrub and herbaceous vegetation types at the biome borders of Northern Eurasia. In comparison, tree dominated vegetation classes in the forest belt of the region were accurately mapped, but were slightly overestimated (10%-20%), in all maps. Low agreement of global maps in the northern and southern vegetation transition zones of Northern Eurasia is likely to have important implications for global change research, as those areas are vulnerable to both climate and socio-economic changes. (C) 2011 Elsevier Inc. All rights reserved.
ELSEVIER - полный текст,
WOS,
Scopus
Держатели документа:
[Pflugmacher, Dirk
Krankina, Olga N.
Kennedy, Robert E.
Nelson, Peder] Oregon State Univ, Dept Forest Ecosyst & Soc, Corvallis, OR 97331 USA
[Cohen, Warren B.] US Forest Serv, USDA, Pacific NW Res Stn, Forestry Sci Lab, Corvallis, OR 97331 USA
[Friedl, Mark A.
Sulla-Menashe, Damien] Boston Univ, Dept Geog & Environm, Boston, MA 02215 USA
[Loboda, Tatiana V.] Univ Maryland, Dept Geog, College Pk, MD 20742 USA
[Kuemmerle, Tobias] Potsdam Inst Climate Impact Res PIK, D-14412 Potsdam, Germany
[Dyukarev, Egor] Inst Monitoring Climat & Ecol Syst, Tomsk 634021, Russia
[Elsakov, Vladimir] Russian Acad Sci, Komi Sci Ctr, Inst Biol, Syktyvkar 167610, Russia
[Kharuk, Viacheslav I.] VN Sukachev Inst Forest, Krasnoyarsk, Russia
Доп.точки доступа:
Pflugmacher, D...; Krankina, O.N.; Cohen, W.B.; Friedl, M.A.; Sulla-Menashe, D...; Kennedy, R.E.; Nelson, P...; Loboda, T.V.; Kuemmerle, T...; Dyukarev, E...; Elsakov, V...; Kharuk, V.I.
Export of dissolved carbon from watersheds of the Central Siberian Plateau
[Text] / A. S. Prokushkin [et al.] // Dokl. Earth Sci. - 2011. - Vol. 441, Is. 1. - P1568-1571, DOI 10.1134/S1028334X11110195. - Cited References: 15. - This work was supported by the Russian Foundation for Basic Research and the American Civilian Research and Development Foundation (project nos. 10-05-92513-IK and RUG1-2980-KR-10), and by the Program of Scientific Cooperation between Russia and France (EC2CO, Environment Cotier PNEC and GDRI CAR-WET-SIB).
. - 4. - ISSN 1028-334X
РУБ Geosciences, Multidisciplinary
Аннотация: The influence of climatic and forest conditions on space and time variations in the concentrations and export of two forms of dissolved carbon (DOC) and dissolved inorganic carbon (DIC) in rivers of the Central Siberian cryolithic zone (Yenisei River basin) draining territory characterized by relatively homogeneous composition of parent rocks was analyzed. Rivers of the northern (Tembenchi and Kochechum rivers), central (Nidym River), and southern parts (Lower Tunguska and Podkamennaya Tunguska rivers) of the Central Siberian Plateau traps were selected as objects of investigation. Along with growth of the water flow rate, increase in the productivity and reserves of carbon in the biogeocenosis of the cryolithic zone leads to significant (more than twice) increase in export of terrigenous DOC and DIC to the hydrographic network.
WOS,
Scopus,
Полный текст
Держатели документа:
Univ New Hampshire, Durham, NH USA
[Prokushkin, A. S.
Korets, M. A.] Russian Acad Sci, Sukachev Inst Forest, Siberian Branch, Krasnoyarsk, Russia
[Pokrovsky, O. S.
Shirokova, L. S.] Russian Acad Sci, Inst Ecol Problems N, Ural Branch, Arkhangelsk, Russia
[Pokrovsky, O. S.
Viers, J.] Univ Toulouse, Lab Mech & Transport Geol, Toulouse, France
[McDowell, W. H.] Univ New Hampshire, Durham, NH 03824 USA
Доп.точки доступа:
Prokushkin, A.S.; Pokrovsky, O.S.; Shirokova, L.S.; Korets, M.A.; Viers, J...; McDowell, W.H.
Аннотация: The influence of climatic and forest conditions on space and time variations in the concentrations and export of two forms of dissolved carbon (DOC) and dissolved inorganic carbon (DIC) in rivers of the Central Siberian cryolithic zone (Yenisei River basin) draining territory characterized by relatively homogeneous composition of parent rocks was analyzed. Rivers of the northern (Tembenchi and Kochechum rivers), central (Nidym River), and southern parts (Lower Tunguska and Podkamennaya Tunguska rivers) of the Central Siberian Plateau traps were selected as objects of investigation. Along with growth of the water flow rate, increase in the productivity and reserves of carbon in the biogeocenosis of the cryolithic zone leads to significant (more than twice) increase in export of terrigenous DOC and DIC to the hydrographic network.
WOS,
Scopus,
Полный текст
Держатели документа:
Univ New Hampshire, Durham, NH USA
[Prokushkin, A. S.
Korets, M. A.] Russian Acad Sci, Sukachev Inst Forest, Siberian Branch, Krasnoyarsk, Russia
[Pokrovsky, O. S.
Shirokova, L. S.] Russian Acad Sci, Inst Ecol Problems N, Ural Branch, Arkhangelsk, Russia
[Pokrovsky, O. S.
Viers, J.] Univ Toulouse, Lab Mech & Transport Geol, Toulouse, France
[McDowell, W. H.] Univ New Hampshire, Durham, NH 03824 USA
Доп.точки доступа:
Prokushkin, A.S.; Pokrovsky, O.S.; Shirokova, L.S.; Korets, M.A.; Viers, J...; McDowell, W.H.
Sources and the flux pattern of dissolved carbon in rivers of the Yenisey basin draining the Central Siberian Plateau
[Text] / A. S. Prokushkin [et al.] // Environ. Res. Lett. - 2011. - Vol. 6, Is. 4. - Ст. 45212, DOI 10.1088/1748-9326/6/4/045212. - Cited References: 63. - This work was supported by the joint US-Russia program between the RFBR and CRDF through grants 10-05-92513 and RUG1-2980-KR-10. Additional support was provided by joint Russian-French Programmes EC2CO, Environement Cotier PNEC and GDRI CAR-WET-SIB, ANR 'Arctic metals' and grant 11.G34.31.0014 of Russian Ministry of higher education and science. We greatly thank Sergey Tenishev for assistance with sample collection during harsh winter and spring periods, and Vladimir Ivanov who provided invaluable daily discharge data for the Nizhnyaya Tunguska and Tembenchi Rivers. We thank three anonymous reviewers for their fruitful and constructive comments that allowed improving greatly the quality of presentation.
. - 14. - ISSN 1748-9326
РУБ Environmental Sciences + Meteorology & Atmospheric Sciences
Аннотация: Frequent measurements of dissolved organic (DOC) and inorganic (DIC) carbon concentrations in rivers during snowmelt, the entire ice-free season, and winter were made in five large watersheds (15 000-174 000 km(2)) of the Central Siberian Plateau (Yenisey River basin). These differ in the degree of continuous permafrost coverage, mean annual air temperature, and the proportion of tundra and forest vegetation. With an annual DOC export from the catchment areas of 2.8-4.7 gC m(-2) as compared to an annual DIC export of 1.0-2.8 gC m(-2), DOC was the dominant component of terrigenous C released to rivers. There was strong temporal variation in the discharge of DOC and DIC. Like for other rivers of the pan-arctic and boreal zones, snowmelt dominated annual fluxes, being 55-71% for water runoff, 64-82% for DOC and 37-41% for DIC. Likewise, DOC and DIC exhibited also a strong spatial variation in C fluxes, with both dissolved C species decreasing from south to north. The rivers of the southern part of the plateau had the largest flow-weighted DOC concentrations among those previously reported for Siberian rivers, but the smallest flow-weighted DIC concentrations. In the study area, DOC and DIC fluxes were negatively correlated with the distribution of continuous permafrost and positively correlated with mean annual air temperature. A synthesis of literature data shows similar trends from west to east, with an eastward decrease of dissolved C concentrations and an increased proportion of DOC in the total dissolved C flux. It appears that there are two contemporary limitations for river export of terrigenous C across Siberia: (1) low productivity of ecosystems with respect to potentially mobilizable organic C, slow weathering rates with concomitant small formation of bicarbonate, and/or wildfire disturbance limit the pools of organic and inorganic C that can be mobilized for transport in rivers (source-limited), and (2) mobilization of available pools of C is constrained by low precipitation in the severe continental climate of interior Siberia (transport-limited). Climate warming may reduce the source limitation by enhancing primary production and weathering rates, while causes leading to surmounting the transport limitation remain debatable due to uncertainties in predictions of precipitation trends and other likely sources of reported increase of river discharges.
WOS,
Scopus
Держатели документа:
[Prokushkin, A. S.
Korets, M. A.
Prokushkin, S. G.] VN Sukachev Inst Forest SB RAS, Krasnoyarsk 660036, Russia
[Pokrovsky, O. S.
Shirokova, L. S.
Viers, J.] Univ Toulouse 3, CNRS, IRD, LMTG OMP, F-31400 Toulouse, France
[Amon, R. M. W.] Texas A&M Univ, Dept Marine Sci, Galveston, TX 77553 USA
[Guggenberger, G.] Leibniz Univ Hannover, Inst Bodenkunde, D-30419 Hannover, Germany
[McDowell, W. H.] Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA
Доп.точки доступа:
Prokushkin, A.S.; Pokrovsky, O.S.; Shirokova, L.S.; Korets, M.A.; Viers, J...; Prokushkin, S.G.; Amon, RMW; Guggenberger, G...; McDowell, W.H.
Рубрики:
ORGANIC-CARBON
CONTINUOUS PERMAFROST
NORTHERN SIBERIA
TRACE-ELEMENTS
CLIMATE-CHANGE
ARCTIC-OCEAN
WATER
BIOGEOCHEMISTRY
GENERATION
SPECIATION
Кл.слова (ненормированные):
dissolved carbon -- riverine flux -- permafrost -- Central Siberian Plateau
ORGANIC-CARBON
CONTINUOUS PERMAFROST
NORTHERN SIBERIA
TRACE-ELEMENTS
CLIMATE-CHANGE
ARCTIC-OCEAN
WATER
BIOGEOCHEMISTRY
GENERATION
SPECIATION
Кл.слова (ненормированные):
dissolved carbon -- riverine flux -- permafrost -- Central Siberian Plateau
Аннотация: Frequent measurements of dissolved organic (DOC) and inorganic (DIC) carbon concentrations in rivers during snowmelt, the entire ice-free season, and winter were made in five large watersheds (15 000-174 000 km(2)) of the Central Siberian Plateau (Yenisey River basin). These differ in the degree of continuous permafrost coverage, mean annual air temperature, and the proportion of tundra and forest vegetation. With an annual DOC export from the catchment areas of 2.8-4.7 gC m(-2) as compared to an annual DIC export of 1.0-2.8 gC m(-2), DOC was the dominant component of terrigenous C released to rivers. There was strong temporal variation in the discharge of DOC and DIC. Like for other rivers of the pan-arctic and boreal zones, snowmelt dominated annual fluxes, being 55-71% for water runoff, 64-82% for DOC and 37-41% for DIC. Likewise, DOC and DIC exhibited also a strong spatial variation in C fluxes, with both dissolved C species decreasing from south to north. The rivers of the southern part of the plateau had the largest flow-weighted DOC concentrations among those previously reported for Siberian rivers, but the smallest flow-weighted DIC concentrations. In the study area, DOC and DIC fluxes were negatively correlated with the distribution of continuous permafrost and positively correlated with mean annual air temperature. A synthesis of literature data shows similar trends from west to east, with an eastward decrease of dissolved C concentrations and an increased proportion of DOC in the total dissolved C flux. It appears that there are two contemporary limitations for river export of terrigenous C across Siberia: (1) low productivity of ecosystems with respect to potentially mobilizable organic C, slow weathering rates with concomitant small formation of bicarbonate, and/or wildfire disturbance limit the pools of organic and inorganic C that can be mobilized for transport in rivers (source-limited), and (2) mobilization of available pools of C is constrained by low precipitation in the severe continental climate of interior Siberia (transport-limited). Climate warming may reduce the source limitation by enhancing primary production and weathering rates, while causes leading to surmounting the transport limitation remain debatable due to uncertainties in predictions of precipitation trends and other likely sources of reported increase of river discharges.
WOS,
Scopus
Держатели документа:
[Prokushkin, A. S.
Korets, M. A.
Prokushkin, S. G.] VN Sukachev Inst Forest SB RAS, Krasnoyarsk 660036, Russia
[Pokrovsky, O. S.
Shirokova, L. S.
Viers, J.] Univ Toulouse 3, CNRS, IRD, LMTG OMP, F-31400 Toulouse, France
[Amon, R. M. W.] Texas A&M Univ, Dept Marine Sci, Galveston, TX 77553 USA
[Guggenberger, G.] Leibniz Univ Hannover, Inst Bodenkunde, D-30419 Hannover, Germany
[McDowell, W. H.] Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA
Доп.точки доступа:
Prokushkin, A.S.; Pokrovsky, O.S.; Shirokova, L.S.; Korets, M.A.; Viers, J...; Prokushkin, S.G.; Amon, RMW; Guggenberger, G...; McDowell, W.H.
Hierarchical mapping of Northern Eurasian land cover using MODIS data
[Text] / D. . Sulla-Menashe [et al.] // Remote Sens. Environ. - 2011. - Vol. 115, Is. 2. - P392-403, DOI 10.1016/j.rse.2010.09.010. - Cited References: 71. - The research was supported by NASA grant numbers NNG06GF54G and NNX08AE61A. An additional thanks goes to Dr. Bin Tan who was instrumental in implementing the MODIS classification algorithms, and to the rest of the NELDA team for helpful input and discussions.
. - 12. - ISSN 0034-4257
РУБ Environmental Sciences + Remote Sensing + Imaging Science & Photographic Technology
Аннотация: The Northern Eurasian land mass encompasses a diverse array of land cover types including tundra, boreal forest, wetlands, semi-arid steppe, and agricultural land use. Despite the well-established importance of Northern Eurasia in the global carbon and climate system, the distribution and properties of land cover in this region are not well characterized. To address this knowledge and data gap, a hierarchical mapping approach was developed that encompasses the study area for the Northern Eurasia Earth System Partnership Initiative (NEESPI). The Northern Eurasia Land Cover (NELC) database developed in this study follows the FAO-land Cover Classification System and provides nested groupings of land cover characteristics, with separate layers for land use, wetlands, and tundra. The database implementation is substantially different from other large-scale land cover datasets that provide maps based on a single set of discrete classes. By providing a database consisting of nested maps and complementary layers, the NELC database provides a flexible framework that allows users to tailor maps to suit their needs. The methods used to create the database combine empirically derived climate-vegetation relationships with results from supervised classifications based on Moderate Resolution Imaging Spectroradiometer (MODIS) data. The hierarchical approach provides an effective framework for integrating climate-vegetation relationships with remote sensing-based classifications, and also allows sources of error to be characterized and attributed to specific levels in the hierarchy. The cross-validated accuracy was 73% for the land cover map and 73% and 91% for the agriculture and wetland classifications, respectively. These results support the use of hierarchical classification and climate-vegetation relationships for mapping land cover at continental scales. (C) 2010 Elsevier Inc. All rights reserved.
WOS,
Полный текст,
Scopus
Держатели документа:
[Sulla-Menashe, Damien
Friedl, Mark A.
Woodcock, Curtis E.
Sibley, Adam] Boston Univ, Dept Geog & Environm, Boston, MA 02215 USA
[Krankina, Olga N.] Oregon State Univ, Coll Forestry, Dept Forest Sci, Corvallis, OR 97331 USA
[Baccini, Alessandro] Woods Hole Res Ctr, Falmouth, MA 02540 USA
[Sun, Guoqing] NASA, GSFC, Biospher Sci Branch, Greenbelt, MD 20770 USA
[Kharuk, Viacheslav] Acad Gorodok Krasnoyarsk, Sukachev Forest Inst, Forest Ecol & Monitoring Branch, Krasnoyarsk 660036, Russia
[Elsakov, Vladimir] Russian Acad Sci, Inst Biol, Komi Sci Ctr, Syktyvkar 167610, Russia
Доп.точки доступа:
Sulla-Menashe, D...; Friedl, M.A.; Krankina, O.N.; Baccini, A...; Woodcock, C.E.; Sibley, A...; Sun, G.Q.; Kharuk, V...; Elsakov, V...
Рубрики:
REMOTELY-SENSED DATA
ACCURACY ASSESSMENT
CLIMATE-CHANGE
CARBON-CYCLE
VEGETATION CLASSIFICATION
PRIOR PROBABILITIES
ARCTIC VEGETATION
SNOW COVER
RESOLUTION
PRODUCTS
Кл.слова (ненормированные):
Land cover -- Classification -- MODIS -- Decision trees -- Biogeography -- Hierarchical classification system
REMOTELY-SENSED DATA
ACCURACY ASSESSMENT
CLIMATE-CHANGE
CARBON-CYCLE
VEGETATION CLASSIFICATION
PRIOR PROBABILITIES
ARCTIC VEGETATION
SNOW COVER
RESOLUTION
PRODUCTS
Кл.слова (ненормированные):
Land cover -- Classification -- MODIS -- Decision trees -- Biogeography -- Hierarchical classification system
Аннотация: The Northern Eurasian land mass encompasses a diverse array of land cover types including tundra, boreal forest, wetlands, semi-arid steppe, and agricultural land use. Despite the well-established importance of Northern Eurasia in the global carbon and climate system, the distribution and properties of land cover in this region are not well characterized. To address this knowledge and data gap, a hierarchical mapping approach was developed that encompasses the study area for the Northern Eurasia Earth System Partnership Initiative (NEESPI). The Northern Eurasia Land Cover (NELC) database developed in this study follows the FAO-land Cover Classification System and provides nested groupings of land cover characteristics, with separate layers for land use, wetlands, and tundra. The database implementation is substantially different from other large-scale land cover datasets that provide maps based on a single set of discrete classes. By providing a database consisting of nested maps and complementary layers, the NELC database provides a flexible framework that allows users to tailor maps to suit their needs. The methods used to create the database combine empirically derived climate-vegetation relationships with results from supervised classifications based on Moderate Resolution Imaging Spectroradiometer (MODIS) data. The hierarchical approach provides an effective framework for integrating climate-vegetation relationships with remote sensing-based classifications, and also allows sources of error to be characterized and attributed to specific levels in the hierarchy. The cross-validated accuracy was 73% for the land cover map and 73% and 91% for the agriculture and wetland classifications, respectively. These results support the use of hierarchical classification and climate-vegetation relationships for mapping land cover at continental scales. (C) 2010 Elsevier Inc. All rights reserved.
WOS,
Полный текст,
Scopus
Держатели документа:
[Sulla-Menashe, Damien
Friedl, Mark A.
Woodcock, Curtis E.
Sibley, Adam] Boston Univ, Dept Geog & Environm, Boston, MA 02215 USA
[Krankina, Olga N.] Oregon State Univ, Coll Forestry, Dept Forest Sci, Corvallis, OR 97331 USA
[Baccini, Alessandro] Woods Hole Res Ctr, Falmouth, MA 02540 USA
[Sun, Guoqing] NASA, GSFC, Biospher Sci Branch, Greenbelt, MD 20770 USA
[Kharuk, Viacheslav] Acad Gorodok Krasnoyarsk, Sukachev Forest Inst, Forest Ecol & Monitoring Branch, Krasnoyarsk 660036, Russia
[Elsakov, Vladimir] Russian Acad Sci, Inst Biol, Komi Sci Ctr, Syktyvkar 167610, Russia
Доп.точки доступа:
Sulla-Menashe, D...; Friedl, M.A.; Krankina, O.N.; Baccini, A...; Woodcock, C.E.; Sibley, A...; Sun, G.Q.; Kharuk, V...; Elsakov, V...
Aerosol particle number size distributions and particulate light absorption at the ZOTTO tall tower (Siberia), 2006-2009
[Text] / J. . Heintzenberg [et al.] // Atmos. Chem. Phys. - 2011. - Vol. 11, Is. 16. - P8703-8719, DOI 10.5194/acp-11-8703-2011. - Cited References: 65. - The Max Planck Society in collaboration with the V. N. Sukachev Institute of Forest established the ZOTTO facility after many years of preparatory fieldwork, planning and massive investments. We thank E.-D. Schulze and M. Heimann (MPI Biogeochemistry), A. A. Onuchin, and S. Verchovetz, (V. N. Sukachev Institute of Forest) for their contributions to the establishment and management of ZOTTO, and Y. Kisilyakhov, A. Tsukanov (V. N. Sukachev Institute of Forest), M. Welling and N. Jurgens (MPI Chemistry), as well as S. Leinert and T. Muller (IfT) for technical support. The ZOTTO project is funded by the Max Plank Society through the International Science and Technology Center (ISTC) partner project #2757p within the framework of the proposal 'Observing and Understanding Biogeochemical Responses to Rapid Climate Changes in Eurasia', and by the German Research Council (DFG). We thank S. Schmidt and K. Kubler (MPI Jena) for their continuous logistic assistance during the experiment. We acknowledge U. Riebel (Technical University of Cottbus, Chair for Particle Technology) for generously sharing his technology of the corona discharge based aerosol neutralizer. We thank A. Wiedensohler (IfT Leipzig) for the fruitful discussions about environmental aerosol charging.
. - 17. - ISSN 1680-7316
РУБ Meteorology & Atmospheric Sciences
Аннотация: This paper analyses aerosol particle number size distributions, particulate absorption at 570 nm wavelength and carbon monoxide (CO) measured between September 2006 and January 2010 at heights of 50 and 300 m at the Zotino Tall Tower Facility (ZOTTO) in Siberia (60.8 degrees N; 89.35 degrees E). Average number, surface and volume concentrations are broadly comparable to former studies covering shorter observation periods. Fits of multiple lognormal distributions yielded three maxima in probability distribution of geometric mean diameters in the Aitken and accumulation size range and a possible secondary maximum in the nucleation size range below 25 nm. The seasonal cycle of particulate absorption shows maximum concentrations in high winter (December) and minimum concentrations in mid-summer (July). The 90th percentile, however, indicates a secondary maximum in July/August that is likely related to forest fires. The strongly combustion derived CO shows a single winter maximum and a late summer minimum, albeit with a considerably smaller seasonal swing than the particle data due to its longer atmospheric lifetime. Total volume and even more so total number show a more complex seasonal variation with maxima in winter, spring, and summer. A cluster analysis of back trajectories and vertical profiles of the pseudo-potential temperature yielded ten clusters with three levels of particle number concentration: Low concentrations in Arctic air masses (400-500 cm(-3)), mid-level concentrations for zonally advected air masses from westerly directions between 55 degrees and 65 degrees N (600-800 cm(-3)), and high concentrations for air masses advected from the belt of industrial and population centers in Siberia and Kazakhstan (1200 cm(-3)). The observational data is representative for large parts of the troposphere over Siberia and might be particularly useful for the validation of global aerosol transport models.
WOS,
Scopus
Держатели документа:
[Heintzenberg, J.
Birmili, W.
Otto, R.] Leibniz Inst Tropospher Res, D-04318 Leipzig, Germany
[Andreae, M. O.
Mayer, J. -C.
Chi, X.] Max Planck Inst Chem, D-55020 Mainz, Germany
[Panov, A.] Russian Acad Sci, Siberian Branch, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Heintzenberg, J...; Birmili, W...; Otto, R...; Andreae, M.O.; Mayer, J.C.; Chi, X...; Panov, A...
Рубрики:
TRAJECTORY CLUSTER-ANALYSIS
LONG-RANGE TRANSPORT
TRACE-GAS
BOREAL FORESTS
ATMOSPHERIC AEROSOLS
FORMATION EVENTS
CENTRAL-EUROPE
AIR-POLLUTION
FLOW PATTERNS
SMEAR-II
TRAJECTORY CLUSTER-ANALYSIS
LONG-RANGE TRANSPORT
TRACE-GAS
BOREAL FORESTS
ATMOSPHERIC AEROSOLS
FORMATION EVENTS
CENTRAL-EUROPE
AIR-POLLUTION
FLOW PATTERNS
SMEAR-II
Аннотация: This paper analyses aerosol particle number size distributions, particulate absorption at 570 nm wavelength and carbon monoxide (CO) measured between September 2006 and January 2010 at heights of 50 and 300 m at the Zotino Tall Tower Facility (ZOTTO) in Siberia (60.8 degrees N; 89.35 degrees E). Average number, surface and volume concentrations are broadly comparable to former studies covering shorter observation periods. Fits of multiple lognormal distributions yielded three maxima in probability distribution of geometric mean diameters in the Aitken and accumulation size range and a possible secondary maximum in the nucleation size range below 25 nm. The seasonal cycle of particulate absorption shows maximum concentrations in high winter (December) and minimum concentrations in mid-summer (July). The 90th percentile, however, indicates a secondary maximum in July/August that is likely related to forest fires. The strongly combustion derived CO shows a single winter maximum and a late summer minimum, albeit with a considerably smaller seasonal swing than the particle data due to its longer atmospheric lifetime. Total volume and even more so total number show a more complex seasonal variation with maxima in winter, spring, and summer. A cluster analysis of back trajectories and vertical profiles of the pseudo-potential temperature yielded ten clusters with three levels of particle number concentration: Low concentrations in Arctic air masses (400-500 cm(-3)), mid-level concentrations for zonally advected air masses from westerly directions between 55 degrees and 65 degrees N (600-800 cm(-3)), and high concentrations for air masses advected from the belt of industrial and population centers in Siberia and Kazakhstan (1200 cm(-3)). The observational data is representative for large parts of the troposphere over Siberia and might be particularly useful for the validation of global aerosol transport models.
WOS,
Scopus
Держатели документа:
[Heintzenberg, J.
Birmili, W.
Otto, R.] Leibniz Inst Tropospher Res, D-04318 Leipzig, Germany
[Andreae, M. O.
Mayer, J. -C.
Chi, X.] Max Planck Inst Chem, D-55020 Mainz, Germany
[Panov, A.] Russian Acad Sci, Siberian Branch, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Heintzenberg, J...; Birmili, W...; Otto, R...; Andreae, M.O.; Mayer, J.C.; Chi, X...; Panov, A...
Landscape controls of CH4 fluxes in a catchment of the forest tundra ecotone in northern Siberia
[Text] / H. . Flessa [et al.] // Glob. Change Biol. - 2008. - Vol. 14, Is. 9. - P2040-2056, DOI 10.1111/j.1365-2486.2008.01633.x. - Cited References: 68
. - 17. - ISSN 1354-1013
РУБ Biodiversity Conservation + Ecology + Environmental Sciences
Аннотация: Terrestrial ecosystems in northern high latitudes exchange large amounts of methane (CH4) with the atmosphere. Climate warming could have a great impact on CH4 exchange, in particular in regions where degradation of permafrost is induced. In order to improve the understanding of the present and future methane dynamics in permafrost regions, we studied CH4 fluxes of typical landscape structures in a small catchment in the forest tundra ecotone in northern Siberia. Gas fluxes were measured using a closed-chamber technique from August to November 2003 and from August 2006 to July 2007 on tree-covered mineral soils with and without permafrost, on a frozen bog plateau, and on a thermokarst pond. For areal integration of the CH4 fluxes, we combined field observations and classification of functional landscape structures based on a high-resolution Quickbird satellite image. All mineral soils were net sinks of atmospheric CH4. The magnitude of annual CH4 uptake was higher for soils without permafrost (1.19 kg CH4 ha(-1) yr(-1)) than for soils with permafrost (0.37 kg CH4 ha(-1) yr(-1)). In well-drained soils, significant CH4 uptake occurred even after the onset of ground frost. Bog plateaux, which stored large amounts of frozen organic carbon, were also a net sink of atmospheric CH4 (0.38 kg CH4 ha(-1) yr(-1)). Thermokarst ponds, which developed from permafrost collapse in bog plateaux, were hot spots of CH4 emission (approximately 200 kg CH4 ha(-1) yr(-1)). Despite the low area coverage of thermokarst ponds (only 2.1% of the total catchment area), emissions from these sites resulted in a mean catchment CH4 emission of 3.8 kg CH4 ha(-1) yr(-1). Export of dissolved CH4 with stream water was insignificant. The results suggest that mineral soils and bog plateaux in this region will respond differently to increasing temperatures and associated permafrost degradation. Net uptake of atmospheric CH4 in mineral soils is expected to gradually increase with increasing active layer depth and soil drainage. Changes in bog plateaux will probably be much more rapid and drastic. Permafrost collapse in frozen bog plateaux would result in high CH4 emissions that act as positive feedback to climate warming.
WOS,
Scopus,
Полный текст
Держатели документа:
[Flessa, Heiner] Univ Gottingen, Buesgen Inst, D-37077 Gottingen, Germany
[Rodionov, Andrej] Univ Cottbus, Chair Soil Protect & Recultivat, D-03046 Cottbus, Germany
[Rodionov, Andrej
Guggenberger, Georg] Univ Halle Wittenberg, Inst Agr & Nutr Sci, D-06108 Halle, Germany
[Fuchs, Hans
Magdon, Paul] Univ Gottingen, Inst Forest Management, D-37077 Gottingen, Germany
[Shibistova, Olga
Zrazhevskaya, Galina
Mikheyeva, Natalia] SB RAS, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
[Kasansky, Oleg A.] SB RAS, Permafrost Inst Yakutsk, Field Stn Igarka, Igarka 663200, Russia
[Blodau, Christian] Univ Bayreuth, Dept Hydrol, D-95440 Bayreuth, Germany
Доп.точки доступа:
Flessa, H...; Rodionov, A...; Guggenberger, G...; Fuchs, H...; Magdon, P...; Shibistova, O...; Zrazhevskaya, G...; Mikheyeva, N...; Kasansky, O.A.; Blodau, C...
Рубрики:
METHANE EMISSIONS
CARBON-DIOXIDE
BOREAL FOREST
ARCTIC TUNDRA
ATMOSPHERIC METHANE
DISCONTINUOUS PERMAFROST
MODELING APPROACH
WESTERN SIBERIA
NITROUS-OXIDE
SOILS
Кл.слова (ненормированные):
active layer -- bog -- catchment -- dissolved methane -- forest tundra -- methane emission -- methane uptake -- permafrost -- thaw ponds -- thermokarst
METHANE EMISSIONS
CARBON-DIOXIDE
BOREAL FOREST
ARCTIC TUNDRA
ATMOSPHERIC METHANE
DISCONTINUOUS PERMAFROST
MODELING APPROACH
WESTERN SIBERIA
NITROUS-OXIDE
SOILS
Кл.слова (ненормированные):
active layer -- bog -- catchment -- dissolved methane -- forest tundra -- methane emission -- methane uptake -- permafrost -- thaw ponds -- thermokarst
Аннотация: Terrestrial ecosystems in northern high latitudes exchange large amounts of methane (CH4) with the atmosphere. Climate warming could have a great impact on CH4 exchange, in particular in regions where degradation of permafrost is induced. In order to improve the understanding of the present and future methane dynamics in permafrost regions, we studied CH4 fluxes of typical landscape structures in a small catchment in the forest tundra ecotone in northern Siberia. Gas fluxes were measured using a closed-chamber technique from August to November 2003 and from August 2006 to July 2007 on tree-covered mineral soils with and without permafrost, on a frozen bog plateau, and on a thermokarst pond. For areal integration of the CH4 fluxes, we combined field observations and classification of functional landscape structures based on a high-resolution Quickbird satellite image. All mineral soils were net sinks of atmospheric CH4. The magnitude of annual CH4 uptake was higher for soils without permafrost (1.19 kg CH4 ha(-1) yr(-1)) than for soils with permafrost (0.37 kg CH4 ha(-1) yr(-1)). In well-drained soils, significant CH4 uptake occurred even after the onset of ground frost. Bog plateaux, which stored large amounts of frozen organic carbon, were also a net sink of atmospheric CH4 (0.38 kg CH4 ha(-1) yr(-1)). Thermokarst ponds, which developed from permafrost collapse in bog plateaux, were hot spots of CH4 emission (approximately 200 kg CH4 ha(-1) yr(-1)). Despite the low area coverage of thermokarst ponds (only 2.1% of the total catchment area), emissions from these sites resulted in a mean catchment CH4 emission of 3.8 kg CH4 ha(-1) yr(-1). Export of dissolved CH4 with stream water was insignificant. The results suggest that mineral soils and bog plateaux in this region will respond differently to increasing temperatures and associated permafrost degradation. Net uptake of atmospheric CH4 in mineral soils is expected to gradually increase with increasing active layer depth and soil drainage. Changes in bog plateaux will probably be much more rapid and drastic. Permafrost collapse in frozen bog plateaux would result in high CH4 emissions that act as positive feedback to climate warming.
WOS,
Scopus,
Полный текст
Держатели документа:
[Flessa, Heiner] Univ Gottingen, Buesgen Inst, D-37077 Gottingen, Germany
[Rodionov, Andrej] Univ Cottbus, Chair Soil Protect & Recultivat, D-03046 Cottbus, Germany
[Rodionov, Andrej
Guggenberger, Georg] Univ Halle Wittenberg, Inst Agr & Nutr Sci, D-06108 Halle, Germany
[Fuchs, Hans
Magdon, Paul] Univ Gottingen, Inst Forest Management, D-37077 Gottingen, Germany
[Shibistova, Olga
Zrazhevskaya, Galina
Mikheyeva, Natalia] SB RAS, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
[Kasansky, Oleg A.] SB RAS, Permafrost Inst Yakutsk, Field Stn Igarka, Igarka 663200, Russia
[Blodau, Christian] Univ Bayreuth, Dept Hydrol, D-95440 Bayreuth, Germany
Доп.точки доступа:
Flessa, H...; Rodionov, A...; Guggenberger, G...; Fuchs, H...; Magdon, P...; Shibistova, O...; Zrazhevskaya, G...; Mikheyeva, N...; Kasansky, O.A.; Blodau, C...
Storage and mobility of black carbon in permafrost soils of the forest tundra ecotone in Northern Siberia
[Text] / G. . Guggenberger [et al.] // Glob. Change Biol. - 2008. - Vol. 14, Is. 6. - P1367-1381, DOI 10.1111/j.1365-2486.2008.01568.x. - Cited References: 72
. - 15. - ISSN 1354-1013
РУБ Biodiversity Conservation + Ecology + Environmental Sciences
Аннотация: Boreal permafrost soils store large amounts of organic carbon (OC). Parts of this carbon (C) might be black carbon (BC) generated during vegetation fires. Rising temperature and permafrost degradation is expected to have different consequences for OC and BC, because BC is considered to be a refractory subfraction of soil organic matter. To get some insight into stocks, variability, and characteristics of BC in permafrost soils, we estimated the benzene polycarboxylic acid (BPCA) method-specific composition and storage of BC, i.e. BPCA-BC, in a 0.44 km(2)-sized catchment at the forest tundra ecotone in northern Siberia. Furthermore, we assessed the BPCA-BC export with the stream draining the catchment. The catchment is composed of various landscape units with south-southwest (SSW) exposed mineral soils characterized by thick active layer or lacking permafrost, north-northeast (NNE) faced mineral soils with thin active layer, and permafrost-affected raised bogs in plateau positions showing in part thermokarst formation. There were indications of vegetation fires at all landscape units. BC was ubiquitous in the catchment soils and BPCA-BC amounted to 0.6-3.0% of OC. This corresponded to a BC storage of 22-3440 g m(-2). The relative contribution of BPCA-BC to OC, as well as the absolute stocks of BPCA-BC were largest in the intact bogs with a shallow active layer followed by mineral soils of the NNE aspects. In both landscape units, a large proportion of BPCA-BC was stored within the permafrost. In contrast, mineral soils with thick active layer or lacking permafrost and organic soils subjected to thermokarst formation stored less BPCA-BC. Permafrost is, hence, not only a crucial factor in the storage of OC but also of BC. In the stream water BPCA-BC amounted on an average to 3.9% of OC, and a yearly export of 0.10 g BPCA-BC m(-2) was calculated, most of it occurring during the period of snow melt with dominance of surface flow. This suggests that BC mobility in dissolved and colloidal phase is an important pathway of BC export from the catchment. Such a transport mechanism may explain the high BC concentrations found in sediments of the Arctic Ocean.
WOS,
Scopus,
Полный текст
Держатели документа:
[Guggenberger, Georg
Rodionov, Andrej
Grabe, Matthias] Univ Halle Wittenberg, Inst Agr & Nutr Sci, D-06108 Halle, Germany
[Rodionov, Andrej] Brandenburg Tech Univ Cottbus, Chair Soil Protect & Recultivat, D-03013 Cottbus, Germany
[Shibistova, Olga
Mikheyeva, Natalia
Zrazhevskaya, Galina] RAS, VN Sukachev Inst Forest, Akademgorodok, Krasnoyarsk 660036, Russia
[Grabe, Matthias] Max Planck Inst Biogeochem, D-07745 Jena, Germany
[Kasansky, Oleg A.] RAS, SB, Field Stn Igarka, Permafrost Inst Yakutsk, Igarka 663200, Russia
[Fuchs, Hans] Univ Gottingen, Inst Forest Management & Yield Sci, D-37077 Gottingen, Germany
[Flessa, Heiner] Univ Gottingen, Inst Soil Sci & Forest Nutr, D-37077 Gottingen, Germany
Доп.точки доступа:
Guggenberger, G...; Rodionov, A...; Shibistova, O...; Grabe, M...; Kasansky, O.A.; Fuchs, H...; Mikheyeva, N...; Zrazhevskaya, G...; Flessa, H...
Рубрики:
DISSOLVED ORGANIC-MATTER
SCOTS PINE FORESTS
BOREAL FOREST
ISOTOPE GEOCHEMISTRY
PYROGENIC CARBON
ARCTIC TUNDRA
STATE C-13
FIRE
CHARCOAL
ECOSYSTEMS
Кл.слова (ненормированные):
active layer -- benzene polycarboxylic acid method -- black carbon -- catchment -- forest tundra -- permafrost -- raised bogs -- soil organic carbon -- thermokarst -- topography
DISSOLVED ORGANIC-MATTER
SCOTS PINE FORESTS
BOREAL FOREST
ISOTOPE GEOCHEMISTRY
PYROGENIC CARBON
ARCTIC TUNDRA
STATE C-13
FIRE
CHARCOAL
ECOSYSTEMS
Кл.слова (ненормированные):
active layer -- benzene polycarboxylic acid method -- black carbon -- catchment -- forest tundra -- permafrost -- raised bogs -- soil organic carbon -- thermokarst -- topography
Аннотация: Boreal permafrost soils store large amounts of organic carbon (OC). Parts of this carbon (C) might be black carbon (BC) generated during vegetation fires. Rising temperature and permafrost degradation is expected to have different consequences for OC and BC, because BC is considered to be a refractory subfraction of soil organic matter. To get some insight into stocks, variability, and characteristics of BC in permafrost soils, we estimated the benzene polycarboxylic acid (BPCA) method-specific composition and storage of BC, i.e. BPCA-BC, in a 0.44 km(2)-sized catchment at the forest tundra ecotone in northern Siberia. Furthermore, we assessed the BPCA-BC export with the stream draining the catchment. The catchment is composed of various landscape units with south-southwest (SSW) exposed mineral soils characterized by thick active layer or lacking permafrost, north-northeast (NNE) faced mineral soils with thin active layer, and permafrost-affected raised bogs in plateau positions showing in part thermokarst formation. There were indications of vegetation fires at all landscape units. BC was ubiquitous in the catchment soils and BPCA-BC amounted to 0.6-3.0% of OC. This corresponded to a BC storage of 22-3440 g m(-2). The relative contribution of BPCA-BC to OC, as well as the absolute stocks of BPCA-BC were largest in the intact bogs with a shallow active layer followed by mineral soils of the NNE aspects. In both landscape units, a large proportion of BPCA-BC was stored within the permafrost. In contrast, mineral soils with thick active layer or lacking permafrost and organic soils subjected to thermokarst formation stored less BPCA-BC. Permafrost is, hence, not only a crucial factor in the storage of OC but also of BC. In the stream water BPCA-BC amounted on an average to 3.9% of OC, and a yearly export of 0.10 g BPCA-BC m(-2) was calculated, most of it occurring during the period of snow melt with dominance of surface flow. This suggests that BC mobility in dissolved and colloidal phase is an important pathway of BC export from the catchment. Such a transport mechanism may explain the high BC concentrations found in sediments of the Arctic Ocean.
WOS,
Scopus,
Полный текст
Держатели документа:
[Guggenberger, Georg
Rodionov, Andrej
Grabe, Matthias] Univ Halle Wittenberg, Inst Agr & Nutr Sci, D-06108 Halle, Germany
[Rodionov, Andrej] Brandenburg Tech Univ Cottbus, Chair Soil Protect & Recultivat, D-03013 Cottbus, Germany
[Shibistova, Olga
Mikheyeva, Natalia
Zrazhevskaya, Galina] RAS, VN Sukachev Inst Forest, Akademgorodok, Krasnoyarsk 660036, Russia
[Grabe, Matthias] Max Planck Inst Biogeochem, D-07745 Jena, Germany
[Kasansky, Oleg A.] RAS, SB, Field Stn Igarka, Permafrost Inst Yakutsk, Igarka 663200, Russia
[Fuchs, Hans] Univ Gottingen, Inst Forest Management & Yield Sci, D-37077 Gottingen, Germany
[Flessa, Heiner] Univ Gottingen, Inst Soil Sci & Forest Nutr, D-37077 Gottingen, Germany
Доп.точки доступа:
Guggenberger, G...; Rodionov, A...; Shibistova, O...; Grabe, M...; Kasansky, O.A.; Fuchs, H...; Mikheyeva, N...; Zrazhevskaya, G...; Flessa, H...
Forest harvesting influence on river runoff in the Lower Angara region
[Text] / A. . Onuchin, T. . Burenina ; ed.: J Krope, Krope, J // ADVANCED TOPICS ON WATER RESOURCES, HYDRAULICS AND HYDROLOGY: PROCEEDINGS OF THE 3RD IASME/WSEAS INTERNATIONAL CONFERENCE ON WATER RESOURCES, HYDRAULICS AND HYDROLOGY (WHH '08). Ser. Mathematics and Computers in Science and Engineering : WORLD SCIENTIFIC AND ENGINEERING ACAD AND SOC, 2008. - 3rd IASME/WSEAS International Conference on Water Resources, Hydraulics and Hydrology (FEB 23-25, 2008, Cambridge, ENGLAND). - P131-133. - Cited References: 6
. - 3. - ISBN 978-960-6766-37-4
РУБ Engineering, Civil + Water Resources
Кл.слова (ненормированные):
hydrological regime -- precipitation -- evaporation -- river flow -- river catchments -- clear cuts -- forest logging
Аннотация: Siberian Rivers account for a great part of water discharge into the Arctic Ocean. Along with the regional climate and the presence permafrost, hydrological processes occurring in catchments of the boreal taiga rivers are controlled by forest harvesting levels. Forests of the Lower Angara region have been harvested extensively over the past fifty years. As a result, forest area has been reduced and forest age structure and composition have changed. These changes are reflected in the natural water budget structure and hydrological regimes of areas. The study revealed that hydrological effects of forest logging conducted in Siberia characterized by a highly continental climate and, hence, severe forest growing conditions differ from those observed for the European Russia.
WOS
Держатели документа:
[Onuchin, Alexander
Burenina, Tamara] Russian Acad Sci, VN Sukachev Inst Forest, Siberian Branch, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Onuchin, A...; Burenina, T...; Krope, J \ed.\
Кл.слова (ненормированные):
hydrological regime -- precipitation -- evaporation -- river flow -- river catchments -- clear cuts -- forest logging
Аннотация: Siberian Rivers account for a great part of water discharge into the Arctic Ocean. Along with the regional climate and the presence permafrost, hydrological processes occurring in catchments of the boreal taiga rivers are controlled by forest harvesting levels. Forests of the Lower Angara region have been harvested extensively over the past fifty years. As a result, forest area has been reduced and forest age structure and composition have changed. These changes are reflected in the natural water budget structure and hydrological regimes of areas. The study revealed that hydrological effects of forest logging conducted in Siberia characterized by a highly continental climate and, hence, severe forest growing conditions differ from those observed for the European Russia.
WOS
Держатели документа:
[Onuchin, Alexander
Burenina, Tamara] Russian Acad Sci, VN Sukachev Inst Forest, Siberian Branch, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Onuchin, A...; Burenina, T...; Krope, J \ed.\
Organic carbon and total nitrogen variability in permafrost-affected soils in a forest tundra ecotone
[Text] / A. . Rodionov [et al.] // Eur. J. Soil Sci. - 2007. - Vol. 58, Is. 6. - P1260-1272, DOI 10.1111/j.1365-2389.2007.00919.x. - Cited References: 44
. - 13. - ISSN 1351-0754
РУБ Soil Science
Аннотация: Soils of the high latitudes are expected to respond sensitively to climate change, but still little is known about carbon and nitrogen variability in them. We investigated the 0.44-km(2) Little Grawijka Creek catchment of the forest tundra ecotone (northern Krasnoyarsk Krai, Russian Federation) in order (i) to relate the active-layer thickness to controlling environmental factors, (ii) to quantify soil organic carbon (SOC) and total nitrogen (NT) stocks, and (iii) to assess their variability with respect to different landscape units. The catchment was mapped on a 50 x 50 m grid for topography, dominant tree and ground vegetation, organic-layer and moss-layer thickness, and active-layer thickness. At each grid point, bulk density, and SOC and NT concentrations were determined for depth increments. At three selected plots, 2-m deep soil cores were taken and analysed for SOC, NT and C-14. A shallow active layer was found in intact raised bogs at plateaux situations and in mineral soils of north-northeast (NNE) aspect. Good drainage and greater solar insolation on the south-southwest (SSW) slopes are reflected in deeper active layers or lack of permafrost. Organic carbon stocks to a soil depth of 90 cm varied between 5 and 95 kg m(-2). The greatest stocks were found in the intact raised bogs and on the NNE slopes. Canonical correspondence analysis indicates the dominant role of active-layer thickness for SOC and NT storage. The 2-m soil cores suggest that permafrost soils store about the same amount of SOC from 90 to 200 cm as in the upper 90 cm. Most of this deep SOC pool was formed in the mid-Holocene (organic soils) and the late Pleistocene (mineral soils). Our results showed that even within a small catchment of the forest tundra, active-layer thickness and, hence, SOC and NT storage vary greatly within the landscape mosaic. This has to be taken into account when using upscaling methods such as remote sensing for assessing SOC and NT storage and cycling at a regional to continental level.
WOS,
Scopus
Держатели документа:
Univ Halle Wittenberg, Inst Agr & Ernahrungswissensch, D-06108 Halle, Germany
Univ Gottingen, Inst Bodenkunde & Waldernahrung, D-37077 Gottingen, Germany
Max Planck Inst Biogeochem, D-07745 Jena, Germany
SB RAS, Field Stn Igarka Permafrost Inst Yakutsk, Igarka 663200, Russia
SB RAS, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Rodionov, A...; Flessa, H...; Grabe, M...; Kazansky, O.A.; Shibistova, O...; Guggenberger, G...
Рубрики:
MONITORING CALM SITES
BOREAL PEATLANDS
ARCTIC TUNDRA
STORAGE
ALASKA
MATTER
DYNAMICS
GRADIENT
QUALITY
FLUXES
MONITORING CALM SITES
BOREAL PEATLANDS
ARCTIC TUNDRA
STORAGE
ALASKA
MATTER
DYNAMICS
GRADIENT
QUALITY
FLUXES
Аннотация: Soils of the high latitudes are expected to respond sensitively to climate change, but still little is known about carbon and nitrogen variability in them. We investigated the 0.44-km(2) Little Grawijka Creek catchment of the forest tundra ecotone (northern Krasnoyarsk Krai, Russian Federation) in order (i) to relate the active-layer thickness to controlling environmental factors, (ii) to quantify soil organic carbon (SOC) and total nitrogen (NT) stocks, and (iii) to assess their variability with respect to different landscape units. The catchment was mapped on a 50 x 50 m grid for topography, dominant tree and ground vegetation, organic-layer and moss-layer thickness, and active-layer thickness. At each grid point, bulk density, and SOC and NT concentrations were determined for depth increments. At three selected plots, 2-m deep soil cores were taken and analysed for SOC, NT and C-14. A shallow active layer was found in intact raised bogs at plateaux situations and in mineral soils of north-northeast (NNE) aspect. Good drainage and greater solar insolation on the south-southwest (SSW) slopes are reflected in deeper active layers or lack of permafrost. Organic carbon stocks to a soil depth of 90 cm varied between 5 and 95 kg m(-2). The greatest stocks were found in the intact raised bogs and on the NNE slopes. Canonical correspondence analysis indicates the dominant role of active-layer thickness for SOC and NT storage. The 2-m soil cores suggest that permafrost soils store about the same amount of SOC from 90 to 200 cm as in the upper 90 cm. Most of this deep SOC pool was formed in the mid-Holocene (organic soils) and the late Pleistocene (mineral soils). Our results showed that even within a small catchment of the forest tundra, active-layer thickness and, hence, SOC and NT storage vary greatly within the landscape mosaic. This has to be taken into account when using upscaling methods such as remote sensing for assessing SOC and NT storage and cycling at a regional to continental level.
WOS,
Scopus
Держатели документа:
Univ Halle Wittenberg, Inst Agr & Ernahrungswissensch, D-06108 Halle, Germany
Univ Gottingen, Inst Bodenkunde & Waldernahrung, D-37077 Gottingen, Germany
Max Planck Inst Biogeochem, D-07745 Jena, Germany
SB RAS, Field Stn Igarka Permafrost Inst Yakutsk, Igarka 663200, Russia
SB RAS, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Rodionov, A...; Flessa, H...; Grabe, M...; Kazansky, O.A.; Shibistova, O...; Guggenberger, G...
Impact of the Arctic Oscillation pattern on interannual forest fire variability in Central Siberia
[Text] / H. . Balzter [et al.] // Geophys. Res. Lett. - 2005. - Vol. 32, Is. 14. - Ст. L14709, DOI 10.1029/2005GL022526. - Cited References: 20
. - 4. - ISSN 0094-8276
РУБ Geosciences, Multidisciplinary
Аннотация: Russia's forests play an important role in the global carbon cycle. Because of their scale and interannual variability, forest fires can change the direction of the net carbon flux over Eurasia. 2002 and 2003 were the first two consecutive years in the atmospheric record in which the carbon content rose by more than 2 ppm per year. Northern Hemisphere fires could be the reason. We show that 2002 and 2003 were the two years with the largest fire extent in Central Siberia since 1996 using new measurements of burned forest area in Central Siberia derived from remote sensing. To quantify the relationship between Siberian forest fires and climate variability, we compare these measurements with time-series of large-scale climatic indices for the period 1992-2003. This paper is amongst the first studies that analyse statistical relationships between interannual variability of forest fires in Russia and climate indices. Significant relationships of annual burned forest area with the Arctic Oscillation, summer temperatures, precipitation, and the El Nino index NINO4 were found (p0.1). In contrast, we find no significant relation with the El Nino indices NINO1, NINO3 or SOI (p0.1). Interannual forest fire variability in Central Siberia could best be explained by a combination of the Arctic Oscillation index and regional summer temperatures (r(2)=0.80).
WOS,
Scopus
Держатели документа:
Ctr Ecol & Hydrol Monks Wood, Climate & Land Surface Syst Interact Ctr, Huntingdon PE28 2LS, Cambs, England
Int Inst Appl Syst Anal, A-2361 Laxenburg, Austria
Russian Acad Sci, Siberian Branch, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
Univ Jena, Inst Geog, D-07743 Jena, Germany
Доп.точки доступа:
Balzter, H...; Gerard, F.F.; George, C.T.; Rowland, C.S.; Jupp, T.E.; McCallum, I...; Shvidenko, A...; Nilsson, S...; Sukhinin, A...; Onuchin, A...; Schmullius, C...
Аннотация: Russia's forests play an important role in the global carbon cycle. Because of their scale and interannual variability, forest fires can change the direction of the net carbon flux over Eurasia. 2002 and 2003 were the first two consecutive years in the atmospheric record in which the carbon content rose by more than 2 ppm per year. Northern Hemisphere fires could be the reason. We show that 2002 and 2003 were the two years with the largest fire extent in Central Siberia since 1996 using new measurements of burned forest area in Central Siberia derived from remote sensing. To quantify the relationship between Siberian forest fires and climate variability, we compare these measurements with time-series of large-scale climatic indices for the period 1992-2003. This paper is amongst the first studies that analyse statistical relationships between interannual variability of forest fires in Russia and climate indices. Significant relationships of annual burned forest area with the Arctic Oscillation, summer temperatures, precipitation, and the El Nino index NINO4 were found (p0.1). In contrast, we find no significant relation with the El Nino indices NINO1, NINO3 or SOI (p0.1). Interannual forest fire variability in Central Siberia could best be explained by a combination of the Arctic Oscillation index and regional summer temperatures (r(2)=0.80).
WOS,
Scopus
Держатели документа:
Ctr Ecol & Hydrol Monks Wood, Climate & Land Surface Syst Interact Ctr, Huntingdon PE28 2LS, Cambs, England
Int Inst Appl Syst Anal, A-2361 Laxenburg, Austria
Russian Acad Sci, Siberian Branch, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
Univ Jena, Inst Geog, D-07743 Jena, Germany
Доп.точки доступа:
Balzter, H...; Gerard, F.F.; George, C.T.; Rowland, C.S.; Jupp, T.E.; McCallum, I...; Shvidenko, A...; Nilsson, S...; Sukhinin, A...; Onuchin, A...; Schmullius, C...
Assessing tundra-taiga boundary with multi-sensor satellite data
[Text] / K. J. Ranson [et al.] // Remote Sens. Environ. - 2004. - Vol. 93, Is. 3. - P283-295, DOI 10.1016/j.rse.2004.06.019. - Cited References: 38
. - 13. - ISSN 0034-4257
РУБ Environmental Sciences + Remote Sensing + Imaging Science & Photographic Technology
Аннотация: Monitoring the dynamics of the circumpolar boreal forest (taiga) and Arctic tundra boundary is important for understanding the causes and consequences of changes observed in these areas. This ecotone, the world's largest, stretches for over 13,400 km and marks the transition between the northern limits of forests and the Southern margin of the tundra. Because of the inaccessibility and large extent of this zone, remote sensing data can play an important role for mapping the characteristics and monitoring the dynamics. Basic understanding of the capabilities of existing space borne instruments for these purposes is required. In this study we examined the use of several remote sensing techniques for characterizing the existing tundra-taiga ecotone. These include Landsat-7, MISR, MODIS and RADARSAT data. Historical cover maps, recent forest stand measurements and high-resolution IKONOS images were used for local ground truth. It was found that a tundra-taiga transitional area can be characterized using multi-spectral Landsat ETM+ summer images, multi-angle MISR red band reflectance images, RADARSAT images with larger incidence angle, or multi-temporal and multi-spectral MODIS data. Because of different resolutions and spectral regions covered, the transition zone maps derived from different data types were not identical, but the general patterns were consistent. (C) 2004 Published by Elsevier Inc.
Полный текст,
WOS,
Scopus
Держатели документа:
NASA, Goddard Space Flight Ctr, Biospher Sci Branch, Greenbelt, MD 20771 USA
Univ Maryland, Dept Geog, College Pk, MD 20742 USA
Academogorodok, VN Sukachev Inst Forest, Krasnoyarsk, Russia
Sci Syst & Applicat Inc, Lanham, MD USA
Доп.точки доступа:
Ranson, K.J.; Sun, G...; Kharuk, V.I.; Kovacs, K...
Рубрики:
LAND-COVER CHANGE
CLIMATE SYSTEM
FOREST-TUNDRA
BOREAL FOREST
VEGETATION
ECOSYSTEMS
COMPONENTS
IMAGERY
RUSSIA
AREA
Кл.слова (ненормированные):
tundra-taiqa transition zone -- landsat -- ETM -- MISR -- MODIS -- RADARSAT -- multi-spectral -- multi-angle -- temporal -- boreal forest
LAND-COVER CHANGE
CLIMATE SYSTEM
FOREST-TUNDRA
BOREAL FOREST
VEGETATION
ECOSYSTEMS
COMPONENTS
IMAGERY
RUSSIA
AREA
Кл.слова (ненормированные):
tundra-taiqa transition zone -- landsat -- ETM -- MISR -- MODIS -- RADARSAT -- multi-spectral -- multi-angle -- temporal -- boreal forest
Аннотация: Monitoring the dynamics of the circumpolar boreal forest (taiga) and Arctic tundra boundary is important for understanding the causes and consequences of changes observed in these areas. This ecotone, the world's largest, stretches for over 13,400 km and marks the transition between the northern limits of forests and the Southern margin of the tundra. Because of the inaccessibility and large extent of this zone, remote sensing data can play an important role for mapping the characteristics and monitoring the dynamics. Basic understanding of the capabilities of existing space borne instruments for these purposes is required. In this study we examined the use of several remote sensing techniques for characterizing the existing tundra-taiga ecotone. These include Landsat-7, MISR, MODIS and RADARSAT data. Historical cover maps, recent forest stand measurements and high-resolution IKONOS images were used for local ground truth. It was found that a tundra-taiga transitional area can be characterized using multi-spectral Landsat ETM+ summer images, multi-angle MISR red band reflectance images, RADARSAT images with larger incidence angle, or multi-temporal and multi-spectral MODIS data. Because of different resolutions and spectral regions covered, the transition zone maps derived from different data types were not identical, but the general patterns were consistent. (C) 2004 Published by Elsevier Inc.
Полный текст,
WOS,
Scopus
Держатели документа:
NASA, Goddard Space Flight Ctr, Biospher Sci Branch, Greenbelt, MD 20771 USA
Univ Maryland, Dept Geog, College Pk, MD 20742 USA
Academogorodok, VN Sukachev Inst Forest, Krasnoyarsk, Russia
Sci Syst & Applicat Inc, Lanham, MD USA
Доп.точки доступа:
Ranson, K.J.; Sun, G...; Kharuk, V.I.; Kovacs, K...
Microbial characteristics of soils on a latitudinal transect in Siberia
[Text] / H. . Santruckova [et al.] // Glob. Change Biol. - 2003. - Vol. 9, Is. 7. - P1106-1117, DOI 10.1046/j.1365-2486.2003.00596.x. - Cited References: 47
. - 12. - ISSN 1354-1013
РУБ Biodiversity Conservation + Ecology + Environmental Sciences
Аннотация: Soil microbial properties were studied from localities on a transect along the Yenisei River, Central Siberia. The 1000 km-long transect, from 56degreesN to 68degreesN, passed through tundra, taiga and pine forest characteristic of Northern Russia. Soil microbial properties were characterized by dehydrogenase activity, microbial biomass, composition of microbial community (PLFAs), respiration rates, denitrification and N mineralization rates. Relationships between vegetation, latitude, soil quality (pH, texture), soil organic carbon (SOC) and the microbial properties were examined using multivariate analysis. In addition, the temperature responses of microbial growth (net growth rate) and activity (soil respiration rate) were tested by laboratory experiments. The major conclusions of the study are as follows: 1. Multivariate analysis of the data revealed significant differences in microbial activity. SOC clay content was positively related to clay content. Soil texture and SOC exhibited the dominant effect on soil microbial parameters, while the vegetation and climatic effects (expressed as a function of latitude) were weaker but still significant. The effect of vegetation cover is linked to SOC quality, which can control soil microbial activity. 2. When compared to fine-textured soils, coarse-textured soils have (i) proportionally more SOC bound in microbial biomass, which might result in higher susceptibility of SOC transformation to fluctuation of environmental factors, and (ii) low mineralization potential, but with a substantial part of the consumed C being transformed to microbial products. 3. The soil microbial community from the northernmost study region located within the permafrost zone appears to be adapted to cold conditions. As a result, microbial net growth rate became negative when temperature rose above 5 degreesC and C mineralization then exceeded C accumulation.
WOS,
Полный текст,
Scopus
Держатели документа:
AS CR, Inst Soil Biol, CZ-37005 Ceske Budejovice, Czech Republic
Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
Australian Natl Univ, Res Sch Biol Sci, Canberra, ACT 0200, Australia
Russian Acad Sci, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
Severtsovs Inst Ecol & Evolut Problems, Moscow 117071, Russia
Max Planck Inst Biogeochem, D-07701 Jena, Germany
Доп.точки доступа:
Santruckova, H...; Bird, M.I.; Kalaschnikov, Y.N.; Grund, M...; Elhottova, D...; Simek, M...; Grigoryev, S...; Gleixner, G...; Arneth, A...; Schulze, E.D.; Lloyd, J...
Рубрики:
ORGANIC-MATTER
BIOMASS-C
ARCTIC TUNDRA
MINERAL SOIL
CO2 FLUX
CARBON
TEMPERATURE
NITROGEN
FOREST
DECOMPOSITION
Кл.слова (ненормированные):
latitudial transect -- microbial net growth rate -- soil microbial activity -- soil organic carbon -- temperature dependency -- texture
ORGANIC-MATTER
BIOMASS-C
ARCTIC TUNDRA
MINERAL SOIL
CO2 FLUX
CARBON
TEMPERATURE
NITROGEN
FOREST
DECOMPOSITION
Кл.слова (ненормированные):
latitudial transect -- microbial net growth rate -- soil microbial activity -- soil organic carbon -- temperature dependency -- texture
Аннотация: Soil microbial properties were studied from localities on a transect along the Yenisei River, Central Siberia. The 1000 km-long transect, from 56degreesN to 68degreesN, passed through tundra, taiga and pine forest characteristic of Northern Russia. Soil microbial properties were characterized by dehydrogenase activity, microbial biomass, composition of microbial community (PLFAs), respiration rates, denitrification and N mineralization rates. Relationships between vegetation, latitude, soil quality (pH, texture), soil organic carbon (SOC) and the microbial properties were examined using multivariate analysis. In addition, the temperature responses of microbial growth (net growth rate) and activity (soil respiration rate) were tested by laboratory experiments. The major conclusions of the study are as follows: 1. Multivariate analysis of the data revealed significant differences in microbial activity. SOC clay content was positively related to clay content. Soil texture and SOC exhibited the dominant effect on soil microbial parameters, while the vegetation and climatic effects (expressed as a function of latitude) were weaker but still significant. The effect of vegetation cover is linked to SOC quality, which can control soil microbial activity. 2. When compared to fine-textured soils, coarse-textured soils have (i) proportionally more SOC bound in microbial biomass, which might result in higher susceptibility of SOC transformation to fluctuation of environmental factors, and (ii) low mineralization potential, but with a substantial part of the consumed C being transformed to microbial products. 3. The soil microbial community from the northernmost study region located within the permafrost zone appears to be adapted to cold conditions. As a result, microbial net growth rate became negative when temperature rose above 5 degreesC and C mineralization then exceeded C accumulation.
WOS,
Полный текст,
Scopus
Держатели документа:
AS CR, Inst Soil Biol, CZ-37005 Ceske Budejovice, Czech Republic
Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
Australian Natl Univ, Res Sch Biol Sci, Canberra, ACT 0200, Australia
Russian Acad Sci, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
Severtsovs Inst Ecol & Evolut Problems, Moscow 117071, Russia
Max Planck Inst Biogeochem, D-07701 Jena, Germany
Доп.точки доступа:
Santruckova, H...; Bird, M.I.; Kalaschnikov, Y.N.; Grund, M...; Elhottova, D...; Simek, M...; Grigoryev, S...; Gleixner, G...; Arneth, A...; Schulze, E.D.; Lloyd, J...
Comparative ecosystem-atmosphere exchange of energy and mass in a European Russian and a central Siberian bog II. Interseasonal and interannual variability of CO2 fluxes
[Text] / A. . Arneth [et al.] // Tellus Ser. B-Chem. Phys. Meteorol. - 2002. - Vol. 54, Is. 5. - P514-530, DOI 10.1034/j.1600-0889.2002.01349.x. - Cited References: 53
. - 17. - ISSN 0280-6509
РУБ Meteorology & Atmospheric Sciences
Аннотация: Net ecosystem-atmosphere exchange of CO2 (NEE) was measured in two boreal bogs during the snow-free periods of 1998, 1999 and 2000. The two sites were located in European Russia (Fyodorovskoye), and in central Siberia (Zotino). Climate at both sites was generally continental but with more extreme summer-winter gradients in temperature at the more eastern site Zotino. The snow-free period in Fyodorovskoye exceeded the snow-free period at Zotino by several weeks. Marked seasonal and interannual differences in NEE were observed at both locations, with contrasting rates and patterns. Amongst the most important contrasts were: (1) Ecosystem respiration at a reference soil temperature was higher at Fyodorovskoye than at Zotino. (2) The diurnal amplitude of summer NEE was larger at Fyodorovskoye than at Zotino. (3) There was a modest tendency for maximum 24 h NEE during average rainfall years to be more negative at Zotino (-0.17 versus -0.15 mol m(-2) d(-1)), suggesting a higher productivity during the summer months. (4) Cumulative net uptake of CO2 during the snow-free period was strongly related to climatic differences between years. In Zotino the interannual variability in climate, and also in the CO2 balance during the snow-free period, was small. However, at Fyodorovskoye the bog was a significant carbon sink in one season and a substantial source for CO2-C in the next, which was below-average dry. Total snow-free uptake and annual estimates of net CO2-C uptake are discussed, including associated uncertainties.
WOS
Держатели документа:
Max Planck Inst Biogeochem, D-07701 Jena, Germany
Max Planck Inst Meteorol, D-20146 Hamburg, Germany
Severtsov Inst Ecol & Evolut, Moscow, Russia
VN Sukachev Forest Inst, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Arneth, A...; Kurbatova, J...; Kolle, O...; Shibistova, O.B.; Lloyd, J...; Vygodskaya, N.N.; Schulze, E.D.
Рубрики:
CARBON-DIOXIDE EXCHANGE
EDDY COVARIANCE
ARCTIC FEN
PEATLAND ECOSYSTEM
NORTHERN PEATLANDS
BOREAL WETLAND
GAS-EXCHANGE
WATER
FOREST
ACCUMULATION
CARBON-DIOXIDE EXCHANGE
EDDY COVARIANCE
ARCTIC FEN
PEATLAND ECOSYSTEM
NORTHERN PEATLANDS
BOREAL WETLAND
GAS-EXCHANGE
WATER
FOREST
ACCUMULATION
Аннотация: Net ecosystem-atmosphere exchange of CO2 (NEE) was measured in two boreal bogs during the snow-free periods of 1998, 1999 and 2000. The two sites were located in European Russia (Fyodorovskoye), and in central Siberia (Zotino). Climate at both sites was generally continental but with more extreme summer-winter gradients in temperature at the more eastern site Zotino. The snow-free period in Fyodorovskoye exceeded the snow-free period at Zotino by several weeks. Marked seasonal and interannual differences in NEE were observed at both locations, with contrasting rates and patterns. Amongst the most important contrasts were: (1) Ecosystem respiration at a reference soil temperature was higher at Fyodorovskoye than at Zotino. (2) The diurnal amplitude of summer NEE was larger at Fyodorovskoye than at Zotino. (3) There was a modest tendency for maximum 24 h NEE during average rainfall years to be more negative at Zotino (-0.17 versus -0.15 mol m(-2) d(-1)), suggesting a higher productivity during the summer months. (4) Cumulative net uptake of CO2 during the snow-free period was strongly related to climatic differences between years. In Zotino the interannual variability in climate, and also in the CO2 balance during the snow-free period, was small. However, at Fyodorovskoye the bog was a significant carbon sink in one season and a substantial source for CO2-C in the next, which was below-average dry. Total snow-free uptake and annual estimates of net CO2-C uptake are discussed, including associated uncertainties.
WOS
Держатели документа:
Max Planck Inst Biogeochem, D-07701 Jena, Germany
Max Planck Inst Meteorol, D-20146 Hamburg, Germany
Severtsov Inst Ecol & Evolut, Moscow, Russia
VN Sukachev Forest Inst, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Arneth, A...; Kurbatova, J...; Kolle, O...; Shibistova, O.B.; Lloyd, J...; Vygodskaya, N.N.; Schulze, E.D.
Long-term climatic changes in the Arctic region of the Northern Hemisphere
[Text] / E. A. Vaganov [et al.] // Dokl. Earth Sci. - 2000. - Vol. 375, Is. 8. - P1314-1317. - Cited References: 12
. - 4. - ISSN 1028-334X
РУБ Geosciences, Multidisciplinary
WOS,
Scopus
Держатели документа:
Russian Acad Sci, Siberian Div, Sukachev Inst Forestry, Krasnoyarsk 660036, Russia
Univ E Anglia, Climat Res Unit, Norwich NR4 7TJ, Norfolk, England
Swiss Fed Inst Forest Snow & Landscape Res, CH-8093 Birmensdorf, Switzerland
Russian Acad Sci, Inst Plant & Anim Ecol, Ural Div, Sverdlovsk 620219, Russia
Доп.точки доступа:
Vaganov, E.A.; Briffa, K.R.; Naurzbaev, M.M.; Schweingruber, F.H.; Shiyatov, S.G.; Shishov, V.V.
WOS,
Scopus
Держатели документа:
Russian Acad Sci, Siberian Div, Sukachev Inst Forestry, Krasnoyarsk 660036, Russia
Univ E Anglia, Climat Res Unit, Norwich NR4 7TJ, Norfolk, England
Swiss Fed Inst Forest Snow & Landscape Res, CH-8093 Birmensdorf, Switzerland
Russian Acad Sci, Inst Plant & Anim Ecol, Ural Div, Sverdlovsk 620219, Russia
Доп.точки доступа:
Vaganov, E.A.; Briffa, K.R.; Naurzbaev, M.M.; Schweingruber, F.H.; Shiyatov, S.G.; Shishov, V.V.