Труды сотрудников ИЛ им. В.Н. Сукачева СО РАН

: материалы временных коллективов / A. S. Prokushkin [и др.] // Boreal forests in a changing world: challenges and needs for action: Proceedings of the International conference August 15-21 2011, Krasnoyarsk, Russia. - Krasnoyarsk : V.N. Sukachev Institute of forest SB RAS, 2011. - С. 346-350. - Библиогр. в конце ст.
Аннотация: Annual dissolved organic (DOC) and inorganic (DIC) carbon concentrations and fluxes in rivers were obtained for 5 large-scale watersheds (15,000-174,000 km2) within Central Siberian Plateau (Yenisey River basin). There are two contamporary limitations of terrigenic C export across Siberia: (1) mobilization of available pools of C is constrained by low precipitation in severe climate of interior Siberia, and (2) low productivity of ecosystems, show weathering rates and/or wildfire disturbance lessen the mobilezeable pools of organic and inorganic C.

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Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28

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Prokushkin, Anatoly Stanislavovich; Прокушкин, Анатолий Станиславович; Korets, Mikhail Anatol'yevich; Корец, Михаил Анатольевич; Rubtsov, A.V.; Рубцов А.В.; Prokushkin, Stanislav Grigor'yevich

[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 1028-334XРУБ 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.

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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.

[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 1748-9326РУБ 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.

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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.

[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 1354-1013РУБ 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.

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[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...

[Text] / A. S. Prokushkin [et al.] // Russ. J. Ecol. - 2008. - Vol. 39, Is. 3. - P151-159, DOI 10.1134/S1067413608030016. - Cited References: 33 . - 9. - ISSN 1067-4136РУБ Ecology

Аннотация: Fluxes of dissolved organic matter (DOM) in larch biogeocenoses and its export from the drainage basin have been studied in the zone of continuous permafrost. A comparative assessment of DOM input into the soil has been made on slopes of northern and southern exposures (as variants reflecting the current state and warming). The dynamics of DOM export in a creek depending on the increasing depth of the active soil horizon in the drainage area have been revealed. It is concluded that an increase in the depth of the seasonally thawing layer induced by global warming will not have any significant effect on the amount of annual DOM export. Reduction of DOM export may be expected upon a decrease in litter stocks under the effect of their mineralization and forest fires.

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[Guggenberger, H.] Univ Halle Wittenberg, D-06108 Halle, Saale, Germany
[Prokushkin, A. S.
Tokareva, I. V.
Prokushkin, S. G.
Abaimov, A. P.] Russian Acad Sci, Sukachev Inst Forest, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Prokushkin, A.S.; Tokareva, I.V.; Prokushkin, S.G.; Abaimov, A.P.; Абаимов Анатолий Платонович; Guggenberger, H...

[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 1354-1013РУБ 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.

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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...

[Text] / A. S. Prokushkin [et al.] // Glob. Biogeochem. Cycle. - 2007. - Vol. 21, Is. 4. - Ст. GB4003, DOI 10.1029/2007GB002938. - Cited References: 39 . - 12. - ISSN 0886-6236РУБ Environmental Sciences + Geosciences, Multidisciplinary + Meteorology & Atmospheric Sciences

Аннотация: Terrestrial and aquatic dissolved organic matter (DOM) was characterized to trace the likely processes of DOM formation and stream export in a permafrost-dominated watershed in central Siberia. Stream samples were collected in spring (May-June 2003) and summer (July-August 2003) at both low flow and stormflow. Dissolved organic matter was analyzed by pyrolysis/gas chromatography/mass spectrometry, and identified pyrolysis products were simultaneously analyzed for compound-specific isotope ratios by isotope ratio mass spectrometry. Pyrograms of terrestrial and stream DOM contained a similar series of pyrolysis products, suggesting a terrestrial origin for DOM in the small stream draining our study catchment. However, despite the overall similarity of chemical composition of stream DOM at different seasons, we also observed distinct differences in isotopic fingerprint between seasons and hydrologic phases ( stormflow versus low flow). This variation appears to be due to the changing origin of stream DOM from different soil layers and the catchment sources following permafrost thawing during the frost-free period. In general, chemical and isotopic composition of stream DOM was similar to DOM produced in soils of colder north facing slopes ( P 0.01) with a shallow active layer. South facing slopes with deeper active layers produce little DOM that enters the stream, suggesting that DOM produced in the active layer is retained and stabilized in underlying, unfrozen mineral soils. Climate change that results in additional seasonal thawing of permafrost-dominated landscapes will decrease the amount of DOM exported to riverine systems and change its chemical composition.

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Держатели документа:
Russian Acad Sci, VN Sukachev Inst Forest, Siberian Branch, Krasnoyarsk 660036, Russia
Max Planck Inst Biogeochem, D-07745 Jena, Germany
Univ New Hampshire, Durham, NH 03824 USA

Доп.точки доступа:
Prokushkin, A.S.; Gleixner, G...; McDowell, W.H.; Ruehlow, S...; Schulze, E.D.

/ A. S. Prokushkin [et al.] // Mitigation and Adaptation Strategies for Global Change. - 2006. - Vol. 11, Is. 1. - P223-240, DOI 10.1007/s11027-006-1022-6 . - ISSN 1381-2386
Аннотация: Hydroclimatic variability and plant species ecology cause mosaics in forested watersheds in permafrost zones. Measurements of organic matter accumulation, stock of dissolved organic carbon (DOC), DOC concentrations in litter leachates, subsurface flow, stream and seasonal and annual export were made in two contrasting slopes and valleys in the northern taiga of Central Siberia. Increased organic carbon accumulation in litter was found in poor hydroclimatic conditions of the north-facing slope and bottom valleys. In contrast, DOC contents and its export to soil were almost two-fold higher in warmer well-drained sites of the south-facing slope. The overall DOC flux to mineral soil from the beginning of June to mid-September was 17 g C m -2 in the south-facing slope sites and only 9 g C m-2 in the north-facing slope sites. DOC export was positively correlated with precipitation stimulating leaching of mobilizable organic matter. Accordingly intra-seasonal and interannual variability of the DOC fluxes was tightly coupled with water input. Meanwhile DOC export in Sphagnum and feathermoss sites showed different behavior in dry and wet years. The presence of permafrost preventing deep seepage of organic solutes results in higher stream DOC fluxes compared to permafrost-free or island permafrost regions. However, thawing of seasonally frozen soil layer during the growing season led to the decreasing concentrations of DOC in the stream from June to September. For two seasons of continuous stream water sampling (June and August-September), the riverine DOC flux constituted about 14% of DOC entering mineral soil on both slopes. The ratio of hydrologic DOC loss to NPP of larch forests of the region was estimated to be 1.1%. В© Springer 2006.

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Держатели документа:
V.N. Sukachev Institute of Forest SB RAS, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State University, Svobodnypr. 79, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Prokushkin, A.S.; Gavrilenko, I.V.; Abaimov, A.P.; Prokushkin, S.G.; Samusenko, A.V.

[Text] / L. A. Diemer [et al.] // Freshw. Sci. - 2015. - Vol. 34, Is. 4. - P1443-1456, DOI 10.1086/683481. - Cited References:63. - We thank the Russian and American researchers and volunteers and the University of New Hampshire (UNH) Water Quality Analysis Laboratory technicians for their assistance in the field and laboratory. Special thanks to Alison Appling, Wilfred Wollheim, Jody Potter, and 2 anonymous referees for their suggestions on the manuscript. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. 147640. We also acknowledge the research support of the Russian Fund for Basic Research No. 14-05-00420 and the Russian Ministry of Education No. 14.B25.31.0031. This research was taken from a thesis submitted to the Graduate School at the University of New Hampshire as part of the requirements for completion of a MS degree (Diemer 2014). . - ISSN 2161-9549. - ISSN 2161-9565РУБ Ecology + Marine & Freshwater Biology

Аннотация: Fire can transform the boreal forest landscape, thereby leading to potential changes in the loading of organic matter and nutrients to receiving streams and in the retention or transformation of these inputs within the drainage network. We used the Tracer Additions for Spiraling Curve Characterization (TASCC) method to conduct 17 nutrient-addition experiments (9 single additions of NO3- and 8 combined additions of NH4+ and PO43-) in 5 boreal headwater streams underlain by continuous permafrost and draining watersheds with a range of burn histories (4->100 y since last burn) in the Nizhnyaya Tunguska River watershed in Central Siberia. Hydrology, ambient nutrient concentration, and the ratio of dissolved organic C (DOC) to nutrients drove rates of nutrient uptake in the streams. Nutrients were taken up with greater efficiency and magnitude under conditions with high flow and reduced diffusive boundary layer (DBL), regardless of watershed burn history. Ambient molar ratio of DOC: PO43- explained some variation in ambient uptake velocity (upsilon(f)) for NH4+ and PO43-. We also observed tight coupling between ambient rates of NH4+ and PO43- uptake across the watershed burn-history gradient. These data suggest that fire-driven changes in stream chemistry may alter N and P retention and subsequent export of materials to downstream receiving waters. Climate change is likely to enhance the frequency and intensity of boreal forest fires and alter the extent of permafrost. Therefore, understanding the interactions among C, N, and P in these Arctic systems has important implications for global biogeochemical cycling.

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Держатели документа:
Univ New Hampshire, Dept Nat Resources, Durham, NH 03824 USA.
Russian Acad Sci, Siberian Branch, VN Sukachev Inst Forest, Krasnoyarsk, Russia.

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Diemer, Laura A.; McDowell, William H.; Wymore, Adam S.; Prokushkin, Anatoly S.; National Science Foundation Graduate Research Fellowship Program [147640]; Russian Fund for Basic Research [14-05-00420]; Russian Ministry of Education [14.B25.31.0031]

/ R. R. Kolosov, A. S. Prokushkin, O. S. Pokrovsky // IOP Conference Series: Earth and Environmental Science : Institute of Physics Publishing, 2016. - Vol. 48: 9th International Conference and Early Career Scientists School on Environmental Observations, Modelling and Information Systems, ENVIROMIS 2016 (11 July 2016 through 16 July 2016, ) Conference code: 125703, Is. 1, DOI 10.1088/1755-1315/48/1/012018 . -
Аннотация: The subarctic rivers of the Central Siberian Plateau have specific fed-characteristics due to the permafrost distribution and the active layer thawing dynamics. Two watersheds with different types of permafrost (from insular to continuous) are studied. Different data sources (Roshydromet and our own observations) are used for receiving anions' (HCO3-, SO4 2-, Cl-) and cations' (Ca2+, Mg2+) fluxes from the Nizhnyaya Tunguska river (1960-2011) and the Tembenchi river (1970-2011). The annual discharge of N. Tunguska for 1939-2011 is characterized by an increase of 0.3 km3/year/year, and for Tembenchi, 0.04 km3/year/year. The major part of the increase (about 60%) is due to spring flooding (May - June). The volume-weighted mean concentrations of major anions and cations in the N. Tunguska river water increased three times in the spring period (40.7 - 116.8 mg/l) and in the summer-fall period (74-212.9 mg/l). On the contrary, such concentrations decreased sharply during the winter mean water period. Due to these results, the total export of main anions and cations from the N. Tunguska river basin rose more than 4,5 times. Two possible reasons can be identified: 1) a water discharge increase of the Subarctic rivers (Peterson et al., 2002); 2) permafrost degradation induced by global climate warming (Frey and McClelland 2009). © Published under licence by IOP Publishing Ltd.

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Держатели документа:
V N Sukachev Institute of Forest, SB RAS, Akademgorodok 50/28, Krasnoyarsk, Russian Federation
Tomsk State University, 36 Lenin Ave., Tomsk, Russian Federation

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Kolosov, R. R.; Prokushkin, A. S.; Pokrovsky, O. S.

/ B. M. Rodriguez-Cardona, A. A. Coble, A. S. Wymore [et al.] // Sci. Rep. - 2020. - Vol. 10, Is. 1. - Ст. 8722, DOI 10.1038/s41598-020-65520-0 . - ISSN 2045-2322
Аннотация: The Central Siberian Plateau is undergoing rapid climate change that has resulted in increased frequency of forest fires and subsequent alteration of watershed carbon and nutrient dynamics. Across a watershed chronosequence (3 to 100 years since wildfire) we quantified the effects of fire on quantity and composition of dissolved organic matter (DOM), stream water nutrient concentrations, as well as in-stream nutrient uptake. Wildfires increased concentrations of nitrate for a decade, while decreasing concentrations of dissolved organic carbon and nitrogen (DOC and DON) and aliphatic DOM contribution for five decades. These post-wildfire changes in stream DOM result in lower uptake efficiency of in-stream nitrate in recently burned watersheds. Nitrate uptake (as uptake velocity) is strongly dependent on DOM composition (e.g. polyphenolics), ambient dissolved inorganic nitrogen (DIN), and DOC to DIN ratios. Our observations and experiments suggest that a decade-long pulse of inorganic nitrogen and a reduction of DOC export occur following wildfires in streams draining the Central Siberian Plateau. Increased fire frequency in the region is thus likely to both decrease DOM and increase nitrate delivery to the main stem Yenisei River, and ultimately the Arctic Ocean, in the coming decades. © 2020, The Author(s).

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Держатели документа:
Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH, United States
National Council for Air and Stream Improvement, Inc., Corvallis, OR, United States
V.N. Sukachev Institute of Forest SB RAS, Krasnoyarsk, Russian Federation
Pontchartrain Institute for Environmental Sciences, Department of Chemistry, University of New Orleans, New Orleans, LA, United States
Department of Earth, Ocean and Atmospheric Sciences, Florida State University, Tallahassee, FL, United States
Departement des Sciences Biologiques, Universite du Quebec a Montreal, Montreal, QC, Canada

Доп.точки доступа:
Rodriguez-Cardona, B. M.; Coble, A. A.; Wymore, A. S.; Kolosov, R.; Podgorski, D. C.; Zito, P.; Spencer, R. G.M.; Prokushkin, A. S.; McDowell, W. H.

/ B. M. Rodriguez-Cardona, A. A. Coble, A. S. Wymore [et al.] // Sci Rep. - 2020. - Vol. 10, Is. 1. - Ст. 8722, DOI 10.1038/s41598-020-65520-0. - Cited References:53. - The authors would like to thank two anonymous reviewers for their suggestions that helped improve this manuscript and the staff and lab members of the Water Quality Analysis Laboratory at the University of New Hampshire especially Carla Lopez-Lloreda for her help in field work. This work was supported by the National Science Foundation Award No. ICER 14-45246, Crossing the boundaries of Critical Zone science with a virtual institute (SAVI); DEB-1556603, Deciphering the role of dissolved organic nitrogen in stream nutrient cycling; RFBR #14-05-00420, Small catchments within the continuous permafrost zone of Central Siberia: the role of wildfire and forest succession in stream biogeochemistry; and #18-05-60203, Landscape and hydrobiological controls on the transport of terrigenic carbon to the Arctic Ocean. The authors also thank Donald F. Smith and the rest of the NHMFL user facility which is supported by the National Science Foundation Division of Chemistry through DMR-1644779 and the State of Florida. Authors declare no conflicts of interest. . - ISSN 2045-2322РУБ Multidisciplinary Sciences

Аннотация: The Central Siberian Plateau is undergoing rapid climate change that has resulted in increased frequency of forest fires and subsequent alteration of watershed carbon and nutrient dynamics. Across a watershed chronosequence (3 to 100 years since wildfire) we quantified the effects of fire on quantity and composition of dissolved organic matter (DOM), stream water nutrient concentrations, as well as in-stream nutrient uptake. Wildfires increased concentrations of nitrate for a decade, while decreasing concentrations of dissolved organic carbon and nitrogen (DOC and DON) and aliphatic DOM contribution for five decades. These post-wildfire changes in stream DOM result in lower uptake efficiency of in-stream nitrate in recently burned watersheds. Nitrate uptake (as uptake velocity) is strongly dependent on DOM composition (e.g. polyphenolics), ambient dissolved inorganic nitrogen (DIN), and DOC to DIN ratios. Our observations and experiments suggest that a decade-long pulse of inorganic nitrogen and a reduction of DOC export occur following wildfires in streams draining the Central Siberian Plateau. Increased fire frequency in the region is thus likely to both decrease DOM and increase nitrate delivery to the main stemYenisei River, and ultimately the Arctic Ocean, in the coming decades.

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Держатели документа:
Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA.
Natl Council Air & Stream Improvement Inc, Corvallis, OR USA.
VN Sukachev Inst Forest SB RAS, Krasnoyarsk, Russia.
Univ New Orleans, Dept Chem, Pontchartrain Inst Environm Sci, New Orleans, LA 70148 USA.
Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA.
Univ Quebec Montreal, Dept Sci Biol, Montreal, PQ, Canada.

Доп.точки доступа:
Rodriguez-Cardona, B. M.; Coble, A. A.; Wymore, A. S.; Kolosov, R.; Podgorski, D. C.; Zito, P.; Spencer, R. G. M.; Prokushkin, A. S.; McDowell, W. H.; Prokushkin, Anatoly; Coble, Ashley; Rodriguez-Cardona, Bianca; Wymore, Adam; National Science FoundationNational Science Foundation (NSF) [ICER 14-45246, DEB-1556603]; RFBRRussian Foundation for Basic Research (RFBR) [14-05-00420, 18-05-60203]; National Science Foundation Division of ChemistryNational Science Foundation (NSF) [DMR-1644779]; State of Florida

/ K. M. Bergen, T. Loboda, J. P. Newell [et al.] // Environ. Res. Lett. - 2020. - Vol. 15, Is. 10. - Ст. 105007, DOI 10.1088/1748-9326/ab98b7. - Cited References:87. - This work was supported by the NASA LCLUC program under award NNX12AD34G. We would like to acknowledge the following for their contributions to data preparation and visualization: Steven Boland, Kevin Brown, Howie Chen, Danielle Cohn, Liting Cui, Jillian Estrada, Sarah Geise, Dan Qiao, Becca Robinson, Yi Wang, Yu-Chen Wang, and Xiaofei Wen. We very much appreciate the constructive comments of the anonymous reviewers in strengthening the focus of this paper. . - ISSN 1748-9326РУБ Environmental Sciences + Meteorology & Atmospheric Sciences

Аннотация: As globally important forested areas situated in a context of dramatic socio-economic changes, Siberia and the Russian Far East (RFE) are important regions to monitor for anthropogenic land-use trends. Therefore, we compiled decadal Landsat-derived land-cover and land-use data for eight dominantly rural case study sites in these regions and focused on trends associated with settlements, agriculture, logging, and roads 1975-2010. Several key spatial-temporal trends emerged from the integrated landscape-scale analyses. First, road building increased in all case study sites over the 35-year period, despite widespread socio-economic decline post-1990. Second, increase in settlements area was negligible over all sites. Third, increased road building, largely of minor roads, was especially high in more rugged and remote RFE case study sites not associated with greater agriculture extent or settlement densities. High demands for wood export coupled with the expansion of commercial timber harvest leases starting in the mid-1990s are likely among leading reasons for an increase in roads. Fourth, although fire was the dominant disturbance over all sites and dates combined, logging exerted a strong land-use pattern, serving as a reminder that considering local anthropogenic landscapes is important, especially in Siberia and the RFE, which represent almost 10% of the Earth's terrestrial land surface. The paper concludes by identifying remaining research needs regarding anthropogenic land use in the region: more frequent moderate spatial resolution imagery and greater access to more finely resolved statistical and other spatial data will enable further research. Social media abstract Landsat reveals long-term anthropogenic land-use trends in Siberia and Russian Far East

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Держатели документа:
Univ Michigan, Sch Environm & Sustainabil, 440 Church St, Ann Arbor, MI 48109 USA.
Univ Maryland, Dept Geog Sci, 2181 LeFrak Hall, College Pk, MD 20742 USA.
Russian Acad Sci, Sukachev Inst Forest, Siberian Branch, Akad Gorodok 50-28, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Svobodny Str 79, Krasnoyarsk 660041, Russia.
Univ Helsinki, Aleksanteri Inst, POB 42,Unioninkatu 33, FI-00014 Helsinki, Finland.
Univ Michigan, Slav Languages & Literatures, 812 E Washington St, Ann Arbor, MI 48109 USA.
Natl Inst Aerosp, 100 Explorat Way, Hampton, VA 23666 USA.

Доп.точки доступа:
Bergen, K. M.; Loboda, T.; Newell, J. P.; Kharuk, V.; Hitztaler, S.; Sun, G.; Johnson, T.; Hoffman-Hall, A.; Ouyang, W.; Park, K.; Fort, C.; Gargulinski, E.; NASA LCLUC program [NNX12AD34G]

/ S. N. Vorobyev, J. Karlsson, Y. Y. Kolesnichenko [et al.] // Biogeosciences. - 2021. - Vol. 18, Is. 17. - P4919-4936, DOI 10.5194/bg-18-4919-2021. - Cited References:104. - This research has been supported by the Government Council on Grants, Russian Federation (grant no. 14.B25.31.0001) and the Forsvarsdepartementet, Sveriges (grant no. 2016-05275). . - ISSN 1726-4170. - ISSN 1726-4189РУБ Ecology + Geosciences, Multidisciplinary

Аннотация: Greenhouse gas (GHG) emission from inland waters of permafrost-affected regions is one of the key factors of circumpolar aquatic ecosystem response to climate warming and permafrost thaw. Riverine systems of central and eastern Siberia contribute a significant part of the water and carbon (C) export to the Arctic Ocean, yet their C exchange with the atmosphere remains poorly known due to lack of in situ GHG concentration and emission estimates. Here we present the results of continuous in situ pCO(2) measurements over a 2600 km transect of the Lena River main stem and lower reaches of 20 major tributaries (together representing a watershed area of 1 661 000 km(2), 66% of the Lena's basin), conducted at the peak of the spring flood. The pCO(2) in the Lena (range 400-1400 mu atm) and tributaries (range 400-1600 mu atm) remained generally stable (within ca. 20 %) over the night-day period and across the river channels. The pCO(2) in tributaries increased northward with mean annual temperature decrease and permafrost increase; this change was positively correlated with C stock in soil, the proportion of deciduous needleleaf forest, and the riparian vegetation. Based on gas transfer coefficients obtained from rivers of the Siberian permafrost zone (k = 4.46md(-1)), we calculated CO2 emission for the main stem and tributaries. Typical fluxes ranged from 1 to 2 gCm(-2) d(-1) ( 99% CO2, 1% CH4), which is comparable with CO2 emission measured in the Kolyma, Yukon, and Mackenzie rivers and permafrost-affected rivers in western Siberia. The areal C emissions from lotic waters of the Lena watershed were quantified by taking into account the total area of permanent and seasonal water of the Lena basin (28 000 km(2)). Assuming 6 months of the year to be an open water period with no emission under ice, the annual C emission from the whole Lena basin is estimated as 8.3 +/- 2.5 TgCyr(-1), which is comparable to the DOC and dissolved inorganic carbon (DIC) lateral export to the Arctic Ocean.

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Держатели документа:
Tomsk State Univ, BIO GEO CLIM Lab, Tomsk, Russia.
Umea Univ, Climate Impacts Res Ctr CIRC, Dept Ecol & Environm Sci, Linnaeus Vag 6, S-90187 Umea, Sweden.
Russian Acad Sci, Siberian Branch, VN Sukachev Inst Forest, KSC SB RAS, Krasnoyarsk 660036, Russia.
CNRS, UMR 5563, Geosci & Environm Toulouse, 14 Ave Edouard Belin, F-31400 Toulouse, France.
Russian Acad Sci, N Laverov Fed Ctr Integrated Arctic Res, Arkhangelsk, Russia.

Доп.точки доступа:
Vorobyev, Sergey N.; Karlsson, Jan; Kolesnichenko, Yuri Y.; Korets, Mikhail A.; Pokrovsky, Oleg S.; Government Council on Grants, Russian Federation [14.B25.31.0001]; Forsvarsdepartementet, Sveriges [2016-05275]

/ L. Gandois, N. I. Tananaev, A. Prokushkin [et al.] // J. Geophys. Res.-Biogeosci. - 2021. - Vol. 126, Is. 10. - Ст. e2020JG006152, DOI 10.1029/2020JG006152. - Cited References:97. - This research was supported by the "Institut ecologie et environnement" of the French "Centre National de la Recherche Scientifique" (CNRS-INEE) through the PEPS program "Blanc" 2015, the "Institut des Sciences de l.univers" through the EC2CO program, a Marie Curie International Reintegration Grant (TOMCAR-Permafrost #277059) within the 7th European Community Framework Program, the mobility program of INPT, and the CNRS Russian-French cooperation "CAR-WET-SIB." The ERANet-LAC joint program (METHANOBASE ELAC2014_DCC-0092), as well as the Russian Fund for Basic Research, Projects No. 18-05-60240-Arctic (N.T., A.P.) and 18-05-60203 (A.P.) provided additional support. The Siberian Branch of the Russian Academy of Sciences supports the Igarka Geocryology Laboratory through its field research facilities support program. Historical geodetic references, pile heights and gauging station descriptions were provided by Turukhansk hydrometeorological observatory staff, regional division of Roshydromet. The authors thank Anatoly Pimov for great help in the field, Arnaud Mansat for the map for Figure 1, Frederic Julien, Virginie Payre-Suc and Didier Lambrigot for the analysis of DOC and major elements (PAPC platform, EcoLab laboratory), Sergei Titov and Roman Kolosov for the analysis at Sukachev Institute of Forest SB RAS and Christine Hatte (LSCE laboratory) for the 14C analysis of DOC. . - ISSN 2169-8953. - ISSN 2169-8961РУБ Environmental Sciences + Geosciences, Multidisciplinary

Аннотация: Intense climate change and permafrost degradation impact northern watersheds and ultimately organic carbon transfer from terrestrial to aquatic ecosystems. We investigated the contemporary dissolved organic carbon (DOC) dynamics in a northern catchment underlain by discontinuous permafrost (Graviyka River, northern Siberia), where historical meteorological and hydrological data are available since 1936. Mean annual air temperature (MAAT), in contrast to precipitation and discharge was found to show a significant increasing trend since 1950. Using in situ sensing of fluorescent dissolved organic matter (fDOM), we estimated DOC concentrations at a high temporal frequency (1h) during 3 years (2015-2018), and calculated annual specific fluxes of 5.2-5.5 g C m(2) yr(-1). High DOC concentrations (above 10 mg L-1) are sustained all year, exhibiting nearly chemostatic behavior. Nevertheless, the high-frequency survey of DOC and other water parameters revealed the seasonality of DOC origin and pathways in the watershed. The spring freshet dominates the annual export (up to 80%), but summer and autumn floods can also contribute up to 9% and 8% respectively. The high-frequency sampling was able to capture the specific dynamic of DOC concentration during spring flood (DOC peak preceding discharge, dilution during the spring freshet) and summer and autumn floods (contribution of DOC-rich, low conductivity water). These observations suggest a significant contribution of organic-rich water originating in peatlands, potentially from degrading palsas. The study demonstrates both that high-frequency sampling is essential to capture key events for DOC export, and that more long-term monitoring is urgently needed in these rapidly evolving watersheds.

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Держатели документа:
Univ Toulouse, Lab Ecol Fonct & Environm, CNRS, INPT,UPS, Toulouse, France.
Russian Acad Sci, Melnikov Permafrost Inst, Yakutsk, Russia.
Russian Acad Sci, Sukachev Inst Forest, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.

Доп.точки доступа:
Gandois, L.; Tananaev, N., I; Prokushkin, A.; Solnyshkin, I.; Teisserenc, R.; "Institut ecologie et environnement" of the French "Centre National de la Recherche Scientifique" (CNRS-INEE) through the PEPS program "Blanc" 2015; "Institut des Sciences de l.univers" through the EC2CO program, a Marie Curie International Reintegration Grant (TOMCAR-Permafrost) within the 7th European Community Framework Program [277059]; INPT; CNRS Russian-French cooperation "CAR-WET-SIB"; ERANet-LAC joint program [METHANOBASE ELAC2014_DCC-0092]; Russian Fund for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-05-60240, 18-05-60203]; Siberian Branch of the Russian Academy of SciencesRussian Academy of Sciences