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A. S. Prokushkin I. V. Tokareva S. G. Prokushkin A. P. Abaimov H. Guggenberger 《Russian Journal of Ecology》2008,39(3):151-159
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. 相似文献
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M. V. Bryukhanova A. V. Kirdyanov A. S. Prokushkin P. P. Silkin 《Russian Journal of Ecology》2013,44(5):361-366
Processes of xylem formation in Dahurian larch have been studied at three sites differing in the hydrothermal regime of soils in the permafrost zone of Middle Siberia. It has been found that the start and end dates of different phases of tree ring formation may differ between the sites by up to 14 days, depending on site conditions. The data obtained contribute to knowledge of possible changes in larch forest phytomass production and provide the possibility of predicting its dynamics under conditions of climate change. 相似文献
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Mashukov D. A. Ben’kova A. V. Ben’kova V. E. Shashkin A. V. Prokushkin A. S. 《Russian Journal of Ecology》2021,52(5):391-398
Russian Journal of Ecology - Abstract—In the north-taiga larch forests of Siberia, on permafrost, there is a widespread phenomenon of crown dieback. To reveal the factors causing crown... 相似文献
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A. S. Prokushkin A. A. Knorre A. V. Kirdyanov E.-D. Schulze 《Russian Journal of Ecology》2006,37(4):225-232
Productivity of the moss cover and necromass accumulation in the litter of a sphagnum larch forest have been estimated on the basis of tree age. It has been shown that the total carbon stock in the litter of a 100-year-old stand, including organic matter not destroyed by fire, exceeds the corresponding value for the tree stand itself by more than an order of magnitude. The accumulation of organic matter on the soil surface inhibits the growth of larch. In particular, this factor impairs hydrothermal conditions in the soil and causes a rise of the permafrost table; as a consequence, lower layers of the root system die off. 相似文献
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A. S. Prokushkin I. V. Gavrilenko A. P. Abaimov S. G. Prokushkin A. V. Samusenko 《Mitigation and Adaptation Strategies for Global Change》2006,11(1):223-240
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 inter-annual 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%. 相似文献
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Panov A. V. Prokushkin A. S. Zrazhevskaya G. K. Urban A. B. Zyryanov V. I. Sidenko N. V. Heimann M. 《Russian Journal of Ecology》2021,52(2):126-135
Russian Journal of Ecology - Winter CO2 fluxes in Central Siberian ecosystems have been measured using different methodological approaches: dynamic chamber measurements at the soil surface under... 相似文献
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