DOI: 10.1007/s10533-017-0354-5
Scopus记录号: 2-s2.0-85021943855
论文题名: Redox and temperature-sensitive changes in microbial communities and soil chemistry dictate greenhouse gas loss from thawed permafrost
作者: Ernakovich J.G. ; Lynch L.M. ; Brewer P.E. ; Calderon F.J. ; Wallenstein M.D.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 134, 期: 2018-01-02 起始页码: 183
结束页码: 200
语种: 英语
英文关键词: Fourier transform infrared (FTIR) spectroscopy
; Greenhouse gas production
; Illumina sequencing
; Information theoretic
; Methanogenesis
; Microbial respiration
Scopus关键词: Akaike information criterion
; carbon dioxide
; community structure
; concentration (composition)
; dissolved organic carbon
; enzyme activity
; FTIR spectroscopy
; greenhouse gas
; metabolism
; methane
; methanogenesis
; microbial community
; permafrost
; redox conditions
; soil respiration
; temperature profile
; Bacteria (microorganisms)
; Prokaryota
英文摘要: Greenhouse gas (GHG) emissions from thawed permafrost are difficult to predict because they result from complex interactions between abiotic drivers and multiple, often competing, microbial metabolic processes. Our objective was to characterize mechanisms controlling methane (CH4) and carbon dioxide (CO2) production from permafrost. We simulated permafrost thaw for the length of one growing season (90 days) in oxic and anoxic treatments at 1 and 15 °C to stimulate aerobic and anaerobic respiration. We measured headspace CH4 and CO2 concentrations, as well as soil chemical and biological parameters (e.g. dissolved organic carbon (DOC) chemistry, microbial enzyme activity, N2O production, bacterial community structure), and applied an information theoretic approach and the Akaike information criterion to find the best explanation for mechanisms controlling GHG flux. In addition to temperature and redox status, CH4 production was explained by the relative abundance of methanogens, activity of non-methanogenic anaerobes, and substrate chemistry. Carbon dioxide production was explained by microbial community structure and chemistry of the DOC pool. We suggest that models of permafrost CO2 production are refined by a holistic view of the system, where the prokaryote community structure and detailed chemistry are considered. In contrast, although CH4 production is the result of many syntrophic interactions, these actions can be aggregated into a linear approach, where there is a single path of organic matter degradation and multiple conditions must be satisfied in order for methanogenesis to occur. This concept advances our mechanistic understanding of the processes governing anaerobic GHG flux, which is critical to understanding the impact the release of permafrost C will have on the global C cycle. © 2017, Springer International Publishing AG. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83270
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: CSIRO Agriculture & Food, PMB 2 Waite Rd, Urrbrae, SA, Australia; Natural Resource Ecology Laboratory, Colorado State University, 1499 Campus Delivery, Fort Collins, CO, United States; Graduate Degree Program in Ecology, 1036 Campus Delivery Colorado State University, Fort Collins, CO, United States; Smithsonian Environmental Research Center, 647 Contees Wharf Rd, Edgewater, MD, United States; USDA-ARS, Central Great Plains Research Station, 40335 Co Rd GG, Akron, CO, United States; Department of Ecosystem Science and Sustainability, Colorado State University, 1499 Campus Delivery, Fort Collins, CO, United States
Recommended Citation:
Ernakovich J.G.,Lynch L.M.,Brewer P.E.,et al. Redox and temperature-sensitive changes in microbial communities and soil chemistry dictate greenhouse gas loss from thawed permafrost[J]. Biogeochemistry,2017-01-01,134(2018-01-02)