DOI: 10.1111/gcb.13839
Scopus记录号: 2-s2.0-85028609215
论文题名: Rate of warming affects temperature sensitivity of anaerobic peat decomposition and greenhouse gas production
作者: Sihi D. ; Inglett P.W. ; Gerber S. ; Inglett K.S.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 1 起始页码: e259
结束页码: e274
语种: 英语
英文关键词: carbon quality
; CH4
; CO2
; global warming potential
; microbial decomposition model
; nutrient availability
; peatlands
; soil C stock
Scopus关键词: air temperature
; anoxic conditions
; carbon dioxide
; decomposition
; global warming
; greenhouse gas
; methane
; nutrient availability
; peatland
; soil carbon
英文摘要: Temperature sensitivity of anaerobic carbon mineralization in wetlands remains poorly represented in most climate models and is especially unconstrained for warmer subtropical and tropical systems which account for a large proportion of global methane emissions. Several studies of experimental warming have documented thermal acclimation of soil respiration involving adjustments in microbial physiology or carbon use efficiency (CUE), with an initial decline in CUE with warming followed by a partial recovery in CUE at a later stage. The variable CUE implies that the rate of warming may impact microbial acclimation and the rate of carbon-dioxide (CO2) and methane (CH4) production. Here, we assessed the effects of warming rate on the decomposition of subtropical peats, by applying either a large single-step (10°C within a day) or a slow ramping (0.1°C/day for 100 days) temperature increase. The extent of thermal acclimation was tested by monitoring CO2 and CH4 production, CUE, and microbial biomass. Total gaseous C loss, CUE, and MBC were greater in the slow (ramp) warming treatment. However, greater values of CH4–C:CO2–C ratios lead to a greater global warming potential in the fast (step) warming treatment. The effect of gradual warming on decomposition was more pronounced in recalcitrant and nutrient-limited soils. Stable carbon isotopes of CH4 and CO2 further indicated the possibility of different carbon processing pathways under the contrasting warming rates. Different responses in fast vs. slow warming treatment combined with different endpoints may indicate alternate pathways with long-term consequences. Incorporations of experimental results into organic matter decomposition models suggest that parameter uncertainties in CUE and CH4–C:CO2–C ratios have a larger impact on long-term soil organic carbon and global warming potential than uncertainty in model structure, and shows that particular rates of warming are central to understand the response of wetland soils to global climate change. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110616
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Wetland Biogeochemistry Laboratory, Soil and Water Sciences Department, University of Florida, Gainesville, FL, United States; University of Maryland Center for Environmental Science Appalachian Laboratory, Frostburg, MD, United States
Recommended Citation:
Sihi D.,Inglett P.W.,Gerber S.,et al. Rate of warming affects temperature sensitivity of anaerobic peat decomposition and greenhouse gas production[J]. Global Change Biology,2018-01-01,24(1)