CH_4 emission from different stages of thermokarst formation in Central Yakutia, East Siberia(Environment)
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概要
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The present study was carried out to evaluate the effect of permafrost thawing on methane (CH_4) emission from different development stages of thermokarst formation in Central Yakutia, East Siberia. Four stages of thermokarst, "Bullar," "Dyede," "Tuumpu" and mature "Alas," differing in age, depth of depression and water presence, were selected for examination. The emission of CH_4 was measured at each thermokarst in forest, dry grassland, wet grassland and on the pond surface. The forest plots were CH_4 sinks and uptake ranged from -1 to -34μg C m^<-2> h^<-1>. The CH_4 fluxes from dry grasslands ranged from -5.4 to 0.9μg C m^<-2> h^<-1>, and in wet grasslands CH_4 fluxes substantially increased, ranging from 3.6 to 285μg C m^<-2> h^<-1>. Pond surfaces had the highest CH_4 emissions, ranging from 657 to 8.0×10^3μg C m^<-2> h^<-1>. The amount of CH_4 stored in the permafrost (up to a depth of 15m) was estimated to be approximately 0.259g C m^<-2>. This value was small compared with the current CH_4 emission from pond surfaces (4.3-16g C m^<-2> growing season^<-1>) in thermokarst depressions. Accordingly, the release of CH_4 trapped in the permafrost was not significant compared with the high CH_4 emission from the pond surface in young thermokarst depressions. The formation of thermokarst involving permafrost thawing could influence the regional CH_4 budget significantly by forming thermokarst wetlands that produce and emit CH_4 as a result of current microbial processes under anaerobic conditions.
著者
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Desyatkin Roman
Institute of Biological Problems of Cryolithzone, Russia Academy of Science
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Desyatkin Roman
Ibpc
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Desyatkin Roman
Institute For Biological Problems Of Cryolithozone Siberian Branch Russian Academy Of Science
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Roman Desyatkin
Ibpc Sb Ras
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Desyatkin Roman
Institute For Biological Problems Of Cryolithozone Russian Academy Of Science
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Alexey Desyatkin
北大院農
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Takakai Fumiaki
北大院農
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Hatano Ryusuke
北大院農
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Desyatkin Alexey
Graduate School of Agriculture, Hokkaido University
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Nikolaeva Maya
Institute for Biological Problems of Cryolithozone, Siberian Branch, Russian Academy of Science
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Fedorov Pavel
Institute for Biological Problems of Cryolithozone, Siberian Branch, Russian Academy of Science
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Hatano Ryusuke
Soil Science Laboratory Graduate School Of Agriculture Hokkaido University
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TAKAKAI Fumiaki
Faculty of Bioresource Sciences, Akita Prefectural University
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HATANO Ryusuke
Research Faculty of Agriculture, Hokkaido University
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Hatano Ryusuke
Research Faculty Of Agriculture Hokkaido University
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Alexey Desyatkin
Soil Science Laboratory Graduate School Of Agriculture Hokkaido University
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Takakai Fumiaki
Faculty Of Bioresource Sciences Akita Prefectural University
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Fedorov Pavel
Institute For Biological Problems Of Cryolithozone Russian Academy Of Science
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Fedorov Pavel
Institute For Biological Problems Of Cryolithozone Siberian Branch Russian Academy Of Science
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Takakai Fumiaki
Akita Prefectural Univ. Akita
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Nikolaeva Maya
Institute For Biological Problems Of Cryolithozone Siberian Branch Russian Academy Of Science
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Desyatkin Alexey
Soil Science Laboratory Graduate School Of Agriculture Hokkaido University
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Hatano Ryusuke
北大 大学院
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Desyatkin Alexey
Graduate School Of Agriculture Hokkaido University
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