Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13839 |
Rate of warming affects temperature sensitivity of anaerobic peat decomposition and greenhouse gas production | |
Sihi, Debjani1,2; Inglett, Patrick W.1; Gerber, Stefan1; Inglett, Kanika S.1 | |
2018 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2018 |
卷号 | 24期号:1页码:E259-E274 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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 degrees C within a day) or a slow ramping (0.1 degrees 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. |
英文关键词 | carbon quality CH4 CO2 global warming potential microbial decomposition model nutrient availability peatlands soil C stock |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000426506100021 |
WOS关键词 | CARBON-USE EFFICIENCY ; ORGANIC-MATTER DECOMPOSITION ; SOIL-CARBON ; LITTER DECOMPOSITION ; MICROBIAL COMMUNITY ; THERMAL-ACCLIMATION ; GROWTH EFFICIENCY ; BACTERIAL-GROWTH ; IGNITION METHOD ; STOICHIOMETRY |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/16942 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Univ Florida, Soil & Water Sci Dept, Wetland Biogeochem Lab, Gainesville, FL 32611 USA; 2.Univ Maryland, Ctr Environm Sci, Appalachian Lab, Frostburg, MD USA |
推荐引用方式 GB/T 7714 | Sihi, Debjani,Inglett, Patrick W.,Gerber, Stefan,et al. Rate of warming affects temperature sensitivity of anaerobic peat decomposition and greenhouse gas production[J]. GLOBAL CHANGE BIOLOGY,2018,24(1):E259-E274. |
APA | Sihi, Debjani,Inglett, Patrick W.,Gerber, Stefan,&Inglett, Kanika S..(2018).Rate of warming affects temperature sensitivity of anaerobic peat decomposition and greenhouse gas production.GLOBAL CHANGE BIOLOGY,24(1),E259-E274. |
MLA | Sihi, Debjani,et al."Rate of warming affects temperature sensitivity of anaerobic peat decomposition and greenhouse gas production".GLOBAL CHANGE BIOLOGY 24.1(2018):E259-E274. |
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