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

/ M. Meroni, N. Tchebakova // Forest Ecology and Management. - 2002. - Vol. 169, № 1-2. - С. 115-122
Аннотация: Direct measurements of CO2 and water vapour of regenerating forests after fire events (secondary succession stages) are needed to determine the role of such disturbances in the biome carbon and water cycles functioning. An estimation of the extension of burnt areas is also required in order to quantify NBP (net biome productivity), a variable that includes large-scale carbon losses (such as fire) bypassing heterotrophic respiration. Hence, eddy covariance measurements Of CO2 and water vapour were carried out in a natural regenerating forest after a fire event. Measurements were collected continuously over a Betula spp. stand in central Siberia during summer 1999. Minimum carbon exchange rate (NEE, net ecosystem exchange) exceeded -30 mumol m(-2) s(-1) (net flux negative indicating CO2 uptake by vegetation) and the partitioning of the available energy was mostly dominated by latent heat flux. Structure, age and composition of the forest were analysed to understand the secondary succession stages. The results were compared with previous studies on coniferous forests where biospheric exchanges of energy were dominated by sensible heat fluxes and small carbon uptake rates, thus indicating rather limiting growing conditions. A classification of a Landsat-4 Thematic Mapper scene has been carried out to determine the magnitude of burnt areas and the extension of broadleaf regenerating forests. Analysis of burnt areas spatial frequency and carbon exchanges of the regenerating forest stress the importance of considering large area disturbances for full carbon accounting. (C) 2002 Elsevier Science B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, Siberian Div, Sukachev Isnt Forestry, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Meroni, M. ; Мерони М.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна

/ J. Kurbatova, N. M. Tchebakova // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 497-513

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

Доп.точки доступа:
Kurbatova, J.; Курбатова Дж.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна

/ A. Arneth, O. Shibistova // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 514-530

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

Доп.точки доступа:
Arneth, A.; Арнет А.; Shibistova, Olga Borisovna; Шибистова, Ольга Борисовна

/ N.M. Tchebakova et al, O. Shibistova // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 537-551
Аннотация: Long-term eddy covariance measurements of energy and water fluxes and associated climatic parameters were carried out above a Scots pine (Pinus sylvestris) forest in the middle taiga zone of Central Siberia. Data from June 1998 through October 2000 are presented. With the exception of winter 1998/1999, data collection over this period were more or less continuous. A distinct seasonality in surface energy exchange characteristics was observed in all years. In early spring in the absence of physiological activity by the vegetation, about 80% of the net radiation was partitioned for sensible heat, resulting in Bowen ratios, beta, as high as 8. In the 1-2 wk period associated with onset of photosynthesis in spring, evaporation rates increased rapidly and beta rapidly dropped. However, even during summer months, sensible heat fluxes typically exceeded latent heat fluxes and beta remained above 2.0. Observed daily evaporation rates varied between 0.5-1.0 mm d(-1) in spring and autumn and 1.5-2 mm d(-1) in midsummer. The overall average for the three growing seasons examined was 1.25 mm d(-1). Precipitation was on average 230 mm for the growing period, with evaporation over the same time being about 190 mm for both 1999 and 2000. This represented only about 35% of the equilibrium evaporation rate. There was typically a positive hydrological balance of 40 mm for the growing season as a whole. However, in all three years examined, evaporation exceeded precipitation totals by 20-40 mm in at least one calendar month during summer. During the growing season, daily averaged surface conductances varied between 0.15 and 0.20 mol m(-2) s(-1) (3-4.5 mm s(-1)) in dry or cool months and 0.30-0.35 mol m(-2) s(-1) (6.5-8 mm s(-1)) in moist and warm months. Despite a negative hydrological balance during midsummer, there was little evidence for reduced canopy conductances in response to soil water deficits. This may have been the consequence of roots accessing water from within or just above a perched water table, located at about 2 m depth.

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Держатели документа:
Russian Acad Sci, Sukachev Inst Forest

Доп.точки доступа:
Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Shibistova, Olga Borisovna; Шибистова, Ольга Борисовна

/ O. Shibistova, G. Zrazhevskaya et al // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 568-589
Аннотация: Using a ground-based and an above-canopy eddy covariance system in addition to stem respiration measurements, the annual respiratory fluxes attributable to soil, stems and foliage were determined for a Scots pine (Pinus sylvestris L.) forest growing in central Siberia. Night-time foliar respiration was estimated on the basis of the difference between fluxes measured below and above the canopy and the stem respiration measurements. Comparison of the effects of night-time turbulence on measured CO2 fluxes showed flux loss above the canopy at low wind speeds, but no such effect was observed for the ground-based eddy system. This suggests that problems with flow homogeneity or flux divergence (both of which would be expected to be greater above the canopy than below) were responsible for above-canopy losses under these conditions. After correcting for this, a strong seasonality in foliar respiration was observed. This was not solely attributable to temperature variations, with intrinsic foliar respiratory capacities being much greater in spring and autumn. The opposite pattern was observed for stem respiration, with the intrinsic respiratory capacity being lower from autumn through early spring. Maximum respiratory activity was observed in early summer. This was not simply associated with a response to higher temperatures but seemed closely linked with cambial activity and the development of new xylem elements. Soil respiration rates exhibited an apparent high sensitivity to temperature, with seasonal data implying a Q(10) of about 7. We interpret this as reflecting covarying changes in soil microbial activity and soil temperatures throughout the snow-free season. Averaged over the two study years (1999 and 2000), the annual respiratory flux was estimated at 38.3 mol C m(-2) a(-1). Of this 0.61 was attributable to soil respiration, with stem respiration accounting for 0.21 and foliar respiration 0.18.

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Держатели документа:
Russian Acad Sci, VN Sukacehv Forest Inst, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Shibistova, Olga Borisovna; Шибистова, Ольга Борисовна; Zrazhevskaya, Galina Kirillovna; Зражевская, Галина Кирилловна

/ J.M. Styles et al, O. Shibistova // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 655-676
Аннотация: A canopy scale model is presented that utilises Lagrangian dispersal theory to describe the relationship between source distribution and concentration within the canopy. The present study differs from previous studies in three ways: (1) source/sink distributions are solved simultaneously for CO2, (CO2)-C-13, H2O and sensible heat to find a solution consistent with leaf-level constraints imposed by photosynthetic capacity, stomatal and boundary layer conductance, available energy and carbon isotopic discrimination during diffusion and carboxylation; (2) the model is used to solve for parameters controlling the nonlinear source interactions rather than the sources themselves; and (3) this study used plant physiological principles to allow the incorporation of within- and above-canopy measurements of the C-13/C-12 ratios Of CO2 as an additional constraint. Source strengths Of CO2, H2O, sensible heat and (CO2)-C-13 within a Siberian mixed-coniferous forest were constrained by biochemical and energy-balance principles applied to sun and shaded leaves throughout the canopy. Parameters relating to maximum photosynthetic capacity, stomatal conductance, radiation penetration and turbulence structure were determined by the optimisation procedure to match modelled and measured concentration profiles, effectively inverting the concentration data. Ground fluxes Of CO2, H2O and sensible heat were also determined by the inversion. Total ecosystem fluxes predicted from the inversion were compared to hourly averaged above-canopy eddy covariance measurements over a ten-day period, with good agreement. Model results showed that stomatal conductance and maximum photosynthetic capacity were depressed due to the low temperatures experienced during snow melt; radiation penetrated further than simple theoretical predictions because of leaf clumping and penumbra, and stability effects were important in the morning and evening. The inversion was limited by little vertical structure in the concentration profiles, particularly of water vapour, and by co-dependence of canopy parameters.

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Держатели документа:
VN Sukachev Inst Forests, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Styles , J.M.; Стайлес Дж.М.; Shibistova, Olga Borisovna; Шибистова, Ольга Борисовна

/ I. Levin, N. M. Tchebakova, O. Shibistova // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 696-712
Аннотация: A three-year trace gas climatology of CO2 and its stable isotopic ratios, as well as CH4, N2O and SF6, derived from regular vertical aircraft sampling over the Eurasian continent is presented. The four sampling sites range from about 1degreesE to 89degreesE in the latitude belt from 48N to 62degreesN. The most prominent features of the CO2 observations are an increase of the seasonal cycle amplitudes of CO2 and delta(13)C-CO2 in the free troposphere (at 3000 m a.s.l.) by more than 60% from Western Europe to Western and Central Siberia. delta(18)O-CO2 shows an even larger increase of the seasonal cycle amplitude by a factor of two from Western Europe towards the Ural mountains, which decreases again towards the most eastern site, Zotino. These data reflect a strong influence of carbon exchange fluxes with the continental biosphere. In particular, during autumn and winter delta(18)O-CO2 shows a decrease by more than 0.5parts per thousand from Orleans (Western Europe) to Syktyvkar (Ural mountains) and Zotino (West Siberia), mainly caused by soil respiration fluxes depleted in delta(18)O with respect to atmospheric CO2. CH4 mixing ratios in the free troposphere at 3000 m over Western Siberia are higher by about 20-30 ppb if compared to Western Europe. Wetland emissions seem to be particularly visible in July-September, with largest signals at Zotino in 1998. Annual mean CH4 mixing ratios decrease slightly from 1998 to 1999 at all Russian sites. In contrast to CO2 and CH4, which show significant vertical gradients between 2000 and 3000 m a.s.l., N2O mixing ratios are vertically very homogeneous and show no significant logitudinal gradient between the Ural mountains and Western Siberia, indicating insignificant emissions of this trace gas from boreal forest ecosystems in Western Siberia. The growth rate of N2O (1.2-1.3 ppb yr(-1)) and the seasonal amplitude (0:5-1.1 ppb) are similar at both aircraft sites, Syktyvkar and Zotino. For SF6 an annual increase of 5% is observed, together with a small seasonal cycle which is in phase with the N2O cycle, indicating that the seasonality of both trace gases are most probably caused by atmospheric transport processes with a possible contribution from stratosphere-troposphere exchange.

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Держатели документа:
Russian Acad Sci, Inst Forest, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Levin, I.; Левин И.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Shibistova, Olga Borisovna; Шибистова, Ольга Борисовна

/ J.M. Styles et al, N. Tchebakova // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 768-783
Аннотация: The integrating properties of the atmospheric boundary layer allow the influence of surface exchange processes on the atmosphere to be quantified and estimates of large-scale fluxes of trace gases and plant isotopic discrimination to be made. Five flights were undertaken over two days in and above the convective boundary layer (CBL) in a vegetated region in central Siberia. Vertical profiles Of CO2 and H2O concentrations, temperature and pressure were obtained during each flight. Air flask samples were taken at various heights for carbon and oxygen isotopic analysis Of CO2. Two CBL budget methods were compared to estimate regional surface fluxes Of CO2 and plant isotopic discrimination against (CO2)-C-13 and (COO)-O-18-O-16. Flux estimates were compared to ground-based eddy covariance measurements. The fluxes obtained for CO2 using the first method agreed to within 10% of fluxes measured in the forest at the study site by eddy covariance. Those obtained from the second method agreed to within 35% when a correction was applied for air loss out of the integrating column and for subsidence. The values for C-13 discrimination were within the range expected from knowledge Of C-3 plant discriminations during photosynthesis, while the inferred O-18 discrimination varied considerably over the two-day period. This variation may in part be explained by the enrichment of chloroplast water during the day due to evaporation from an initial signature in the morning close to source water. Additional potential complications arising from the heterogeneous nature of the landscape are discussed.

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Держатели документа:
Russian Acad Sci, VN Sukachev Forest Inst, Siberian Div, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Styles et al, J.M.; Стайлес Дж.М.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна

: материалы временных коллективов / A. S. Prokushkin [и др.] // 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. 135-142. - Библиогр. в конце ст.
Аннотация: Estimation of the flux of water soluble organic matter through larch stand components has showed that potential DOC stock of forest floor, litter and upper 5-cm soil layer depended on stand location on relief.

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

Доп.точки доступа:
Prokushkin, Anatoly Stanislavovich; Прокушкин, Анатолий Станиславович; Prokushkin, Staniclav Grigor'evich; Прокушкин Станислав Григорьевич; Koike, T.; Койке Т.; Abaimov, Anatoly Platonovich ; Абаимов Анатолий Платонович

: материалы временных коллективов / A. S. Prokushkin [и др.] // Canadian Journal of Forest Research. - 2005. - Vol. 35, № : 9. - С. 2130-2140
Аннотация: Fluxes of dissolved organic carbon (DOC) in forested watersheds underlain by permafrost are likely to vary with changes in climatic regime that increase soil moisture and temperature. It was examined the effects of temporal and spatial variations in soil temperature and moisture on DOC fluxes from the forest floor contrasting north- and south-facing slopes in central Siberia.

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

Доп.точки доступа:
Prokushkin, Anatoly Stanislavovich; Прокушкин, Анатолий Станиславович; Kajimoto, T.; Каджимото Т; Prokushkin, Staniclav Grigor'evich; Прокушкин Станислав Григорьевич; McDowell, W.H.; Макдоуелл В.Х.; Abaimov, Anatoly Platonovich; Абаимов Анатолий Платонович; Matsuura, Y.; Матсуура У.

: материалы временных коллективов / A. S. Prokushkin [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. 78

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

Доп.точки доступа:
Prokushkin, Anatoly Stanislavovich; Прокушкин, Анатолий Станиславович; Tokaryeva, Irina Vladimirovna; Токарева, Ирина Владимировна; Prokushkin, Stanislav Grigor'yevich; Прокушкин Станислав Григорьевич; Abaimov, Anatoly Platonovich; Абаимов Анатолий Платонович

: материалы временных коллективов / T. Morishita [и др.] // Symptom of environmental change in Siberian permafrost region: proceedings of the International symposium of JSPS core to core program between Hokkaido university and Martin Luther university Halle-Wittenberg in 29-30 November 2005, Sapporo, Japan. - Sapporo : Hokkaido University Press, 2006. - С. 1-9. - Библиогр. в конце ст.

УДК

502

Аннотация: The CO2 flux was positively correlated with soil temperature and negatively correlated with soil moisture. The CO2 flux was lowest in the Aulacomnium patch among the patches because of the low soil temperature and high soil moisture. The CO2 emission and CH4 uptake were smaller the previously reported values. The C/N ratio in soil might be an important factor explaining the low CO2 emission, and the low CH4 production may be related to the microtopography at the site.

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

Доп.точки доступа:
Morishita, T.; Моришита Т.; Matsuura, Y.; Мацуура Й; Zyryanova, Olga Alexandrovna; Зырянова Ольга Александровна; Abaimov, Anatoly Platonovich; Абаимов Анатолий Платонович
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: материалы временных коллективов / A. S. Prokushkin [и др.] // Symptom of environmental change in Siberian permafrost region: proceedings of the International symposium of JSPS core to core program between Hokkaido university and Martin Luther university Halle-Wittenberg in 29-30 November 2005, Sapporo, Japan. - Sapporo : Hokkaido University Press, 2006. - С. 113-121. - Библиогр. в конце ст.

УДК

502

Аннотация: Terrestrial flux of DOC to stream is contributed from different sources of different qualities and quantities differing at different hydrological phases and seasons. To trace the share of every one of these fluxes is still required for further understanding of DOC production and mobilization in the permafrost affected ecosystem.

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

Доп.точки доступа:
Prokushkin, Anatoly Stanislavovich; Прокушкин, Анатолий Станиславович; Hobara, S.; Хобара С.; Tokaryeva, Irina Vladimirovna; Prokushkin, Stanislav Grigor'yevich; Прокушкин Станислав Григорьевич; Abaimov, Anatoly Platonovich; Абаимов Анатолий Платонович
Имеются экземпляры в отделах:
РСФ (05.12.2006г. (1 экз.) - Б.ц.) - свободны 1

: материалы временных коллективов / E. F. Vedrova // Water, air & soil pollution. - 1995. - Vol. 82, № 1-2. - С. 239-246. - Библиогр. в конце ст.
Аннотация: Between 72 and 88% of carbon (C) loss in forest litter decomposition returns to the atmosphere in the form of carbon dioxide. The share of water-soluble organic products does not exceed 3-4%. Between 8% under spruce and 25% under aspen and pine of the total C loss from litter organic matter goes to the formation of humus. Decomposition intensity of the dead organic matter on the soil surface is close to annual litterfall income (except under cedar). The specific rate of decomposition processes among the coniferous litters is minimum for cedar (167 mg C g-1 yr-1) and maximum for larch (249 mg C-1 yr-1). The spicific rate of decomposition of organic residues under aspen and birch canopies are 344 and 362 mg C-1 yr-1.

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

Доп.точки доступа:
Ведрова Эстелла Федоровна
Имеются экземпляры в отделах:
Арх (02.05.2007г. (1 экз.) - Б.ц.) - свободны 1

: материалы временных коллективов / A. S. Prokushkin [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. 78

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

Доп.точки доступа:
Prokushkin, Anatoly Stanislavovich; Прокушкин, Анатолий Станиславович; Tokareva, Irina Vladimirovna; Токарева Ирина Владимировна; Prokushkin, Staniclav Grigor'evich; Прокушкин Станислав Григорьевич; Abaimov, Anatoly Platonovich; Абаимов Анатолий Платонович
Имеются экземпляры в отделах:
РСФ (04.02.2008г. (1 экз.) - Б.ц.) - свободны 1

: материалы временных коллективов / I. N. Bezkorovaynaya // 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. 305-307. - Библиогр. в конце ст.
Аннотация: Estimating terrestrial ecosystem CO2 fluxes is very important for our understanding of the global carbon cycle. This paper presents a zero-dimensional mathematical model of the ecosystem of Siberian boreal forests. It was used for comparison tall-tower-based CO2 fluxes with biometric field measurements. The model is a system of ordinary differential equations with additional conditions superimposed on the parameters. The main occurring proceses.are described - photosynthesis, respiration, seasonal changes of active phytomass, water balance of trees, the influence of light, humidity, and temperature of phytosynthesis and respiration.

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

Доп.точки доступа:
Barkhatov, Y.V.; Бархатов Й.В.; Timokhina, Anastasiya Vladimirovna; Panov, Alexey Vasil'yevich; Панов, Алексей Васильевич; Vedrova, Estella Fedorovna; Ведрова, Эстелла Федоровна; Trefilova, Ol'ga Vladimirovna; Трефилова, Ольга Владимировна

: 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.

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

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

: материалы временных коллективов / V. N. Sedykh, S. Maksutov // 354-355Boreal 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: This paper addresses use of Kolesnikov's geographic/genetic (geogenetic) forest type classification in managing dynamics of carbon fluxes in Siberian forests and dicusses ways of the classification improvement to enable assessment of forest cover state satellite images.

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

Доп.точки доступа:
Maksutov, S.; Максутов С.; Седых, Владимир Николаевич

/ 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 1631-0713РУБ 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.

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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.

/ L. . Mukhortova // Bosque. - 2012. - Vol. 33, Is. 3. - P261-265, DOI 10.4067/S0717-92002012000300005. - Cited References: 10. - This research was supported by the Russian Foundation for Basic Research (RFBR) (Grants 10-04-00337 and 11-04-01884) and by joint grants of RFBR and Krasnoyarsk Regional Foundation for Science and Technical Development (Projects 11-04-98008 and 11-04-98089). . - 5. - ISSN 0304-8799РУБ Ecology + Forestry

Аннотация: Forest harvesting is a major human-caused disturbance affecting carbon budgets in forest ecosystems. This study was concerned with post-logging carbon pool changes in Scots pine (Pinus sylvestris) and Siberian fir (Abies sibirica) stands. To understand carbon budget recovery trends following logging, carbon stock and fluxes were measured in stands differing in time since logging. In both Scots pine and fir stands disturbed by logging, the tree phytomass contribution to the carbon budget decreased drastically, whereas the coarse woody debris (CWD) carbon pool exhibited a marked increase. Sixty years following logging, the Scots pine stand carbon storage was almost 70 % of that prior to logging and the ratio between the phytomass and soil organic matter was the same as before the disturbance. While the phytomass carbon showed a similar trend in the fir stand of the same age, it was less than on the control stand. In a 50-55-year-old fir stand, 26 years since harvesting, the phytomass carbon recovered only by 15 %. Siberian fir and Scots pine logging sites differed in CWD loading and decomposition rate. The phytomass dynamics and CWD loading values obtained suggest that Scots pine stands which have experienced logging are most likely carbon sinks, as was clear from the phytomass production exceeding organic matter decomposition-caused fluxes. Conversely, logged fir ecosystems are likely to be sources of carbon to the atmosphere due to a large CWD loading, faster rate of its decomposition, and slow phytomass increment.

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Scopus

Держатели документа:
Russian Acad Sci, Siberian Branch, VN Sukachev Inst Forest, Krasnoyarsk, Russia

Доп.точки доступа:
Mukhortova, L...; Мухортова, Людмила Владимировна