DOI: 10.1007/s10533-015-0075-6
Scopus记录号: 2-s2.0-84925503529
论文题名: Non-linear response of carbon dioxide and methane emissions to oxygen availability in a drained histosol
作者: McNicol G. ; Silver W.L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 123, 期: 2018-01-02 起始页码: 299
结束页码: 306
语种: 英语
英文关键词: Carbon dioxide
; Drained peatland
; Histosol
; Methane
; Oxygen
; Soil respiration
英文摘要: Organic-rich wetland soils in the histosol soil order represent the largest soil carbon (C) pool globally. Carbon accumulation in these ecosystems is largely due to oxygen (O2) limitation of decomposition. Increased O2 availability from wetland drainage and climate change may stimulate C decomposition overall and affect the balance of carbon dioxide (CO2) and methane (CH4) greenhouse gas release. Characterizing relationships, including non-linearity, between soil O2 and C gas emissions is therefore critical to predict the partitioning and rate of C release from histosols under greater O2 availability. We varied gas-phase O2 concentration from 0.03 to 20 % in incubations of a sapric histosol and measured resulting CO2 and CH4 emissions. Efflux of CO2 increased and CH4 emissions decreased at higher O2 concentrations, and rates were best described by log-linear model fits. The non-linear response of CO2 and CH4 emissions to O2 concentration indicates that moist, C rich histosols may be highly sensitive to increases in O2 availability, even below concentration thresholds typically classified as anoxic. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83542
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Environmental Science, Policy, and Management, University of California, Berkeley, 130 Mulford Hall, #3114, Berkeley, CA, United States
Recommended Citation:
McNicol G.,Silver W.L.. Non-linear response of carbon dioxide and methane emissions to oxygen availability in a drained histosol[J]. Biogeochemistry,2015-01-01,123(2018-01-02)