DOI: 10.1002/2017GB005774
Scopus记录号: 2-s2.0-85038612870
论文题名: Long-Term Drainage Reduces CO2 Uptake and CH4 Emissions in a Siberian Permafrost Ecosystem
作者: Kittler F ; , Heimann M ; , Kolle O ; , Zimov N ; , Zimov S ; , Göckede M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 12 起始页码: 1704
结束页码: 1717
语种: 英语
英文关键词: Arctic
; carbon fluxes
; climate change
; eddy-covariance
; permafrost
Scopus关键词: annual variation
; biogeochemical cycle
; carbon cycle
; data set
; eddy covariance
; growing season
; long-term change
; methane
; organic carbon
; permafrost
; sustainability
; temperature effect
; tundra
; water table
; Arctic
; Siberia
英文摘要: Permafrost landscapes in northern high latitudes with their massive organic carbon stocks are an important, poorly known, component of the global carbon cycle. However, in light of future Arctic warming, the sustainability of these carbon pools is uncertain. To a large part, this is due to a limited understanding of the carbon cycle processes because of sparse observations in Arctic permafrost ecosystems. Here we present an eddy covariance data set covering more than 3 years of continuous CO2 and CH4 flux observations within a moist tussock tundra ecosystem near Chersky in north-eastern Siberia. Through parallel observations of a disturbed (drained) area and a control area nearby, we aim to evaluate the long-term effects of a persistently lowered water table on the net vertical carbon exchange budgets and the dominating biogeochemical mechanisms. Persistently drier soils trigger systematic shifts in the tundra ecosystem carbon cycle patterns. Both, uptake rates of CO2 and emissions of CH4 decreased. Year-round measurements emphasize the importance of the non-growing season—in particular the “zero-curtain” period in the fall—to the annual budget. Approximately 60% of the CO2 uptake in the growing season is lost during the cold seasons, while CH4 emissions during the non-growing season account for 30% of the annual budget. Year-to-year variability in temperature conditions during the late growing season was identified as the primary control of the interannual variability observed in the CO2 and CH4 fluxes. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77688
Appears in Collections: 气候变化事实与影响
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作者单位: Max Planck Institute for Biogeochemistry, Jena, Germany; Division of Atmospheric Sciences, University of Helsinki, Helsinki, Finland; North-East Science Station, Pacific Institute for Geography, Far-Eastern Branch of Russian Academy of Science, Cherskii, Russian Federation
Recommended Citation:
Kittler F,, Heimann M,, Kolle O,et al. Long-Term Drainage Reduces CO2 Uptake and CH4 Emissions in a Siberian Permafrost Ecosystem[J]. Global Biogeochemical Cycles,2017-01-01,31(12)