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

: материалы временных коллективов / G. Guggenberger [и др.] // Climatic changes and their impact on boreal and temperate forests: Abstracts of the International conference (June 5-7, Ekaterinburg, Russia) : Ural State Forest Engineering University, 2006. - С. 32-33

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

Доп.точки доступа:
Guggenberger, G.; Гугенбергер Г.; Rodionov, Andrej; Родионов Андрей; Flessa, H.; Флесса Х.; Shibistova, Olga Borisovna; Шибистова, Ольга Борисовна

: материалы временных коллективов / G. Guggenberger [и др.] // Climate change and their impact on boreal and temperate forests: Abstracts of the International Conference (June 5-7, 2006, Ekaterinburg, Russia). - 2006. - С. 32

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

Доп.точки доступа:
Guggenberger, G.; Гугенбергер Г.; Rodionov, Andrej; Flessa, H.; Флесса Х.; Shibistova, Olga Borisovna; Шибистова, Ольга Борисовна
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[Text] / C. . Blodau [et al.] // J. Geophys. Res.-Biogeosci. - 2008. - Vol. 113, Is. G3. - Ст. G03023, DOI 10.1029/2007JG000652. - Cited References: 45. - The support of the Deutsche Forschungsgemeinschaft (DFG) and of the German Ministry of Science and Education (BMBF) to H. Flessa, G. Guggenberger, and C. Blodau is gratefully acknowledged. We thank Martina Heider for laboratory assistance, Pjotr Karas and Alexander Tiunov for all their help with field work, and Swetlana Poljuhova (Field Station Igarka of the Permafrost Institute Yakutsk) for excellent laboratory analyses and help with respect to logistics. . - 8. - ISSN 0148-0227РУБ Environmental Sciences + Geosciences, Multidisciplinary

Аннотация: Thermokarst wetlands and ponds in the subarctic, which are located in land surface depressions resulting from permafrost melt, are strong sources of CH4, but little is known about respiration processes supporting these emissions. We determined CH4 fluxes and concentration profiles of dissolved gases and anions and some delta C-13 ratios of CO2 and CH4 in a thermokarst pond and adjacent smaller thermokarst depressions in the forest tundra near Igarka, northern Siberia in August 2006. Methane was emitted at 110-170 mg m(-2) d(-1) and produced mostly by CO2 reduction, which also provided high Gibbs free energies on the order of 50-70 KJ mol(-1) H-2 due to high H-2 concentrations. The diffusive flux calculated from CH4 gradients in the floating mat contributed 2% to emissions. CH4 was apparently not oxidized deeper than 20 cm into the floating mat and the water body below. Anaerobic respiration required to reproduce nonsteady state CO2 concentration maxima in the floating mat above the water body was 30-80 nmol cm(-3) d(-1) or 250 mg m(-2) d(-1) and thus on a similar order of magnitude as CH4 fluxes. The results suggest that floating mat-covered thermokarst ponds located in northern Siberian bogs effectively convert recently fixed carbon into CH4 and thus allow for emissions independently from the finite, bog-derived carbon source. The relative contribution of recently fixed and old bog-derived carbon to C fluxes requires further investigation, however.

Держатели документа:
[Blodau, Christian
Rees, Rainer
Knorr, Klaus-Holger] Univ Bayreuth, Limnol Res Stn, D-95440 Bayreuth, Germany
[Blodau, Christian
Rees, Rainer
Knorr, Klaus-Holger] Univ Bayreuth, Dept Hydrol, D-95440 Bayreuth, Germany
[Flessa, Heiner] Univ Gottingen, Buesgeninst, D-37077 Gottingen, Germany
[Rodionov, Andrej
Guggenberger, Georg] Univ Halle Wittenberg, Inst Agr & Nutr Sci, D-06108 Halle, Germany
[Shibistova, Olga
Zrazhevskaya, Galina
Mikheeva, Natalia] SB RAS, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
[Kasansky, Oleg A.] SB RAS, Permafrost Inst Yakutsk, Field Stn Igarka, Igarka 663200, Russia

Доп.точки доступа:
Blodau, C...; Rees, R...; Flessa, H...; Rodionov, A...; Guggenberger, G...; Knorr, K.H.; Shibistova, O...; Zrazhevskaya, G...; Mikheeva, N...; Kasansky, O.A.

/ C. Blodau [et al.] // Journal of Geophysical Research G: Biogeosciences. - 2008. - Vol. 113, Is. 3. - Ст. G03023, DOI 10.1029/2007JG000652 . - ISSN 0148-0227
Аннотация: Thermokarst wetlands and ponds in the subarctic, which are located in land surface depressions resulting from permafrost melt, are strong sources of CH4, but little is known about respiration processes supporting these emissions. We determined CH4 fluxes and concentration profiles of dissolved gases and anions and some ?13C ratios of CO 2 and CH4 in a thermokarst pond and adjacent smaller thermokarst depressions in the forest tundra near Igarka, northern Siberia in August 2006. Methane was emitted at 110-170 mg m-2 d-1 and produced mostly by CO2 reduction, which also provided high Gibbs free energies on the order of 50-70 KJ mol-1 H2 due to high H2concentrations. The diffusive flux calculated from CH 4 gradients in the floating mat contributed <2% to emissions. CH4 was apparently not oxidized deeper than 20 cm into the floating mat and the water body below. Anaerobic respiration required to reproduce nonsteady state CO2 concentration maxima in the floating mat above the water body was 30-80 nmol cm-3 d-1 or 250 mg m -2 d-1 and thus on a similar order of magnitude as CH 4 fluxes. The results suggest that floating mat-covered thermokarst ponds located in northern Siberian bogs effectively convert recently fixed carbon into CH4 and thus allow for emissions independently from the finite, bog-derived carbon source. The relative contribution of recently fixed and old bog-derived carbon to C fluxes requires further investigation, however. Copyright 2008 by the American Geophysical Union.

Scopus

Держатели документа:
Limnological Research Station, Department of Hydrology, University of Bayreuth, 95440 Bayreuth, Germany
Soil Science of Temperate and Boreal Ecosystems, Buesgeninstitute, University of Gottingen, Busgenweg 2, 37077 Gottingen, Germany
Soil Sciences, Institute of Agricultural and Nutritional Sciences, Martin Luther University HalleWittenberg, Weidenplan 14, 06108 Halle, Germany
Field Station Igarka of the Permafrost Institute Yakutsk, SB-RAS, 1st Microrayon 8a, 663200 Igarka, Russian Federation
VN Sukachev Institute of Forest, SB-RAS, Akademgorodok, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Blodau, C.; Rees, R.; Flessa, H.; Rodionov, A.; Guggenberger, G.; Knorr, K.-H.; Shibistova, O.; Zrazhevskaya, G.; Mikheeva, N.; Kasansky, O.A.

/ A. Evgrafova [et al.] // Geoderma. - 2018. - Vol. 329. - P91-107, DOI 10.1016/j.geoderma.2018.05.014 . - ISSN 0016-7061
Аннотация: The vulnerability of soil organic matter (SOM) sequestered in permafrost-affected soils to climate change plays one of the key roles in the global carbon (C) cycle. However, it still remains unclear how changing soil and site-specific factors, associated with the changing depth of the permafrost table due to thawing, influence the spatial distribution and variability of soil organic carbon (SOC) and total nitrogen (N) stocks in high-latitude mineral soils. The relationships between the spatial variation of SOC and N stocks (0–30 cm) and active layer (AL) thickness, thickness of the organic layer (OL), soil acidity, Al and Fe hydroxides as well as plant- and microbial-derived C inputs were studied using ordinary statistics and geostatistics within six landscape patches (16 m2) in the Siberian forest-tundra ecotone underlain by warm and discontinuous permafrost. At deeper permafrost table, SOC and N stocks (0–30 cm) were lower and, according to the semivariogram analysis, an overall homogenization of SOC and N distribution at the analyzed scale occurred. Total N and SOC stocks were spatially independent from root-derived organic matter distribution (i.e. the concentration of suberin-derived monomers) at shallow AL patches, whereas there was a significant positive spatial correlation within deep AL and non-permafrost soils. Hence, the development of root systems and an increase in rooting depth, leading to “hot spots” of SOM accumulation at intensively rooted soil patches, was observed as a result of deeper AL. Total N and SOC stocks within deeper AL and non-permafrost subsoils were also positively spatially correlated with the concentration of Fe and Al hydroxides, demonstrating the importance of organo-mineral associations for SOM stabilization in soils with lower permafrost table. This study confirmed that deepening of the AL in boreal forest ecosystems may lead to an overall homogenization of SOM distribution and simultaneous development of distinct mechanisms of SOM accumulation and stabilization. © 2018 Elsevier B.V.

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WOS

Держатели документа:
Soil Science Group, Geography Department, University of Bern, Bern, Switzerland
Institute for Integrated Natural Sciences, Germany Geography Department, University of Koblenz-Landau, Koblenz, Germany
Institute of Soil Science, Leibniz Universitat Hannover, Hanover, Germany
VN Sukachev Institute of Forest, SB-RAS, Akademgorodok, Krasnoyarsk, Russian Federation
Igarka Geocryology Laboratory, Melnikov Permafrost Institute, Yakutsk, Russian Federation
Department of Soil Science and Plant Nutrition, Christian-Albrechts-University of Kiel, Kiel, Germany

Доп.точки доступа:
Evgrafova, A.; de la Haye, T. R.; Haase, I.; Shibistova, O.; Guggenberger, G.; Tananaev, N.; Sauheitl, L.; Spielvogel, S.

/ Y. Dvornikov, E. Novenko, M. Korets, A. Olchev // Remote Sens. - 2022. - Vol. 14, Is. 3. - Ст. 790, DOI 10.3390/rs14030790. - Cited References:48. - The studies of the key study regions in Vanavara, Igarka, and Turukhansk (field experiments and satellite data analysis conducted by Y.D. and E.N.) were supported by the Russian Science Foundation (grant 20-17-00043). The data analysis for the study area in Tura was conducted by M.K. and supported by the Russian Science Foundation (grant 21-17-00163). The forest inventory data analysis was also conducted by M.K. and supported by the Russian Foundation for Basic Research (grant 20-45-242908). . - ISSN 2072-4292РУБ Environmental Sciences + Geosciences, Multidisciplinary + Remote Sensing

Аннотация: The history of wildfires along a latitudinal transect from forest-tundra to middle taiga in North-Central Siberia was reconstructed for the period from 1985 to 2020 using Landsat imagery. The transect passed through four key regions (75 x 75 km(2)) with different climate and landscape conditions that allowed us to evaluate regional wildfire dynamics as well as estimate differences in post-fire forest recovery. The Level-2A Landsat data (TM, ETM+, and OLI) were used to derive: (i) burned area (BA) locations, (ii) timing of wildfire occurrence (date, month, or season), (iii) fire severity, and (iv) trends in post-fire vegetation recovery. We used pre-selected and pre-processed scenes suitable for BA mapping taken within four consecutive time intervals covering the entire period of data analysis (1985-2020). Pre- and post-fire dynamics of forest vegetation were described using spectral indices, i.e., NBR and NDVI. We found that during the last three decades, the maximum BA occurred in the southernmost Vanavara region where approximate to 58% of the area burned. Total BA gradually decreased to the northwest with a minimum in the Igarka region (approximate to 1%). Nearly half of these BAs appeared between summer 2013 and autumn 2020 due to higher frequency of hot and dry weather. The most severe wildfires were detected in the most northeastern Tura region. Analysis of NDVI and NBR dynamics showed that the mean period of post-fire vegetation recovery ranged between 20 and 25 years. The time of vegetation recovery at BAs with repeat wildfires and high severity was significantly longer.

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Держатели документа:
Peoples Friendship Univ Russia, Agr Technol Inst, Dept Landscape Design & Sustainable Ecosyst, Moscow 117198, Russia.
Lomonosov Moscow State Univ, Fac Geog, GSP-1,1-12 Leninskie Gory, Moscow 119991, Russia.
Russian Acad Sci, Inst Geog, Staromonetny Lane 29, Moscow 119017, Russia.
Russian Acad Sci, VN Sukachev Inst Forest, KSC SB RAS, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Shirshov Inst Oceanol, Moscow 117997, Russia.

Доп.точки доступа:
Dvornikov, Yury; Novenko, Elena; Korets, Mikhail; Olchev, Alexander; Russian Science FoundationRussian Science Foundation (RSF) [20-17-00043, 21-17-00163, 20-45-242908]