DOI: 10.1002/2017JG004069
Scopus记录号: 2-s2.0-85042108000
论文题名: Short and Long-Term Controls on Active Layer and Permafrost Carbon Turnover Across the Arctic
作者: Faucherre S. ; Jørgensen C.J. ; Blok D. ; Weiss N. ; Siewert M.B. ; Bang-Andreasen T. ; Hugelius G. ; Kuhry P. ; Elberling B.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 2 起始页码: 372
结束页码: 390
语种: 英语
英文关键词: carbon
; carbon dioxide
; carbon mineralization
; decomposition
; permafrost
英文摘要: Decomposition of soil organic matter (SOM) in permafrost terrain and the production of greenhouse gases is a key factor for understanding climate change-carbon feedbacks. Previous studies have shown that SOM decomposition is mostly controlled by soil temperature, soil moisture, and carbon-nitrogen ratio (C:N). However, focus has generally been on site-specific processes and little is known about variations in the controls on SOM decomposition across Arctic sites. For assessing SOM decomposition, we retrieved 241 samples from 101 soil profiles across three contrasting Arctic regions and incubated them in the laboratory under aerobic conditions. We assessed soil carbon losses (Closs) five times during a 1 year incubation. The incubated material consisted of near-surface active layer (ALNS), subsurface active layer (ALSS), peat, and permafrost samples. Samples were analyzed for carbon, nitrogen, water content, δ13C, δ15N, and dry bulk density (DBD). While no significant differences were observed between total ALSS and permafrost Closs over 1 year incubation (2.3 ± 2.4% and 2.5 ± 1.5% Closs, respectively), ALNS samples showed higher Closs (7.9 ± 4.2%). DBD was the best explanatory parameter for active layer Closs across sites. Additionally, results of permafrost samples show that C:N ratio can be used to characterize initial Closs between sites. This data set on the influence of abiotic parameter on microbial SOM decomposition can improve model simulations of Arctic soil CO2 production by providing representative mean values of CO2 production rates and identifying standard parameters or proxies for upscaling potential CO2 production from site to regional scales. ©2018. 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/114621
Appears in Collections: 气候减缓与适应
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作者单位: Center for Permafrost (CENPERM), University of Copenhagen, Copenhagen, Denmark; Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden; Department of Physical Geography, Stockholm University, Stockholm, Sweden; Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden; Department of Environmental Science, Aarhus University, Roskilde, Denmark; Department of Biology, University of Copenhagen, Copenhagen, Denmark
Recommended Citation:
Faucherre S.,Jørgensen C.J.,Blok D.,et al. Short and Long-Term Controls on Active Layer and Permafrost Carbon Turnover Across the Arctic[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(2)