DOI: 10.1007/s10533-015-0161-9
Scopus记录号: 2-s2.0-84951569121
论文题名: Rates and pathways of methanogenesis in hypersaline environments as determined by 13C-labeling
作者: Kelley C.A. ; Chanton J.P. ; Bebout B.M.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 126, 期: 3 起始页码: 329
结束页码: 341
语种: 英语
英文关键词: 13C-labeling
; Hypersaline environments
; Methane
; Stable carbon isotopes
Scopus关键词: carbon isotope
; evaporite
; gas production
; gypsum
; hypersaline environment
; methanogenesis
; microbial mat
; photosynthesis
; radiocarbon dating
; stable isotope
; substrate
; California
; Chile
; Mexico [North America]
; United States
英文摘要: Rates and pathways of methane production were determined from photosynthetic soft microbial mats and gypsum-encrusted endoevaporites collected in hypersaline environments from California, Mexico and Chile, as well as an organic-rich mud from a pond in the El Tatio volcanic fields, Chile. Samples (mud, soft mats and endoevaporites) were incubated anaerobically with deoxygenated site water, and the increase in methane concentration through time in the headspaces of the incubation vials was used to determine methane production rates. To ascertain the substrates used by the methanogens, 13C-labeled methylamines, methanol, dimethylsulfide, acetate or bicarbonate were added to the incubations (one substrate per vial) and the stable isotopic composition of the resulting methane was measured. The vials amended with 13C-labeled methylamines produced the most 13C-enriched methane, generally followed by the 13C-labeled methanol-amended vials. The stable isotope data and the methane production rates were used to determine first order rate constants for each of the substrates at each of the sites. Estimates of individual substrate use revealed that the methylamines produced 55–92 % of the methane generated, while methanol was responsible for another 8–40 %. © 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/83438
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 Geological Sciences, University of Missouri, Columbia, MO, United States; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Exobiology Branch, NASA Ames Research Center, Moffett Field, CA, United States
Recommended Citation:
Kelley C.A.,Chanton J.P.,Bebout B.M.. Rates and pathways of methanogenesis in hypersaline environments as determined by 13C-labeling[J]. Biogeochemistry,2015-01-01,126(3)