DOI: 10.1111/gcb.12572
论文题名: Temperature and peat type control CO2 and CH4 production in Alaskan permafrost peats
作者: Treat C.C. ; Wollheim W.M. ; Varner R.K. ; Grandy A.S. ; Talbot J. ; Frolking S.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 8 起始页码: 2674
结束页码: 2686
语种: 英语
英文关键词: Arctic
; Boreal
; Carbon
; Climate change
; Methane
; Peatland
; Permafrost thaw
Scopus关键词: arctic environment
; carbon dioxide
; carbon emission
; climate change
; methane
; organic carbon
; peatland
; permafrost
; radiative forcing
; soil organic matter
; thawing
; Alaska
; United States
; carbon
; carbon dioxide
; methane
; nitrogen
; soil
; water
; chemistry
; microbiology
; soil
; temperature
; United States
; Alaska
; Carbon
; Carbon Dioxide
; Methane
; Nitrogen
; Soil
; Soil Microbiology
; Temperature
; Water
英文摘要: Controls on the fate of ~277 Pg of soil organic carbon (C) stored in permafrost peatland soils remain poorly understood despite the potential for a significant positive feedback to climate change. Our objective was to quantify the temperature, moisture, organic matter, and microbial controls on soil organic carbon (SOC) losses following permafrost thaw in peat soils across Alaska. We compared the carbon dioxide (CO2) and methane (CH4) emissions from peat samples collected at active layer and permafrost depths when incubated aerobically and anaerobically at -5, -0.5, +4, and +20 °C. Temperature had a strong, positive effect on C emissions; global warming potential (GWP) was >3× larger at 20 °C than at 4 °C. Anaerobic conditions significantly reduced CO2 emissions and GWP by 47% at 20 °C but did not have a significant effect at -0.5 °C. Net anaerobic CH4 production over 30 days was 7.1 ± 2.8 μg CH4-C gC-1 at 20 °C. Cumulative CO2 emissions were related to organic matter chemistry and best predicted by the relative abundance of polysaccharides and proteins (R2 = 0.81) in SOC. Carbon emissions (CO2-C + CH4-C) from the active layer depth peat ranged from 77% larger to not significantly different than permafrost depths and varied depending on the peat type and peat decomposition stage rather than thermal state. Potential SOC losses with warming depend not only on the magnitude of temperature increase and hydrology but also organic matter quality, permafrost history, and vegetation dynamics, which will ultimately determine net radiative forcing due to permafrost thaw. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62090
Appears in Collections: 影响、适应和脆弱性
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作者单位: Earth Systems Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, United States; Department of Earth Sciences, University of New Hampshire, Durham, NH, United States; Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH, United States; Department of Geography, Université de Montréal, Montreal, QC, Canada
Recommended Citation:
Treat C.C.,Wollheim W.M.,Varner R.K.,et al. Temperature and peat type control CO2 and CH4 production in Alaskan permafrost peats[J]. Global Change Biology,2014-01-01,20(8)