DOI: 10.1111/gbi.12214
Scopus记录号: 2-s2.0-84989313316
论文题名: Microbial contributions to subterranean methane sinks
作者: Lennon J.T. ; Nguyễn-Thùy D. ; Phạm T.M. ; Drobniak A. ; Tạ P.H. ; Phạm N.Ð. ; Streil T. ; Webster K.D. ; Schimmelmann A.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2017
卷: 15, 期: 2 起始页码: 254
结束页码: 258
语种: 英语
Scopus关键词: biogeochemical cycle
; cave
; concentration (composition)
; geomicrobiology
; methane
; methanogenic bacterium
; methanotrophy
; microbial activity
; microbial community
; rock
; source-sink dynamics
; subterranean environment
; Viet Nam
; methane
; bacterium
; cave
; metabolism
; microbiology
; oxidation reduction reaction
; Viet Nam
; Bacteria
; Caves
; Methane
; Oxidation-Reduction
; Vietnam
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences
; Environmental Science: General Environmental Science
; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Sources and sinks of methane (CH4) are critical for understanding global biogeochemical cycles and their role in climate change. A growing number of studies have reported that CH4 concentrations in cave ecosystems are depleted, leading to the notion that these subterranean environments may act as sinks for atmospheric CH4. Recently, it was hypothesized that this CH4 depletion may be caused by radiolysis, an abiotic process whereby CH4 is oxidized via interactions with ionizing radiation derived from radioactive decay. An alternate explanation is that the depletion of CH4 concentrations in caves could be due to biological processes, specifically oxidation by methanotrophic bacteria. We theoretically explored the radiolysis hypothesis and conclude that it is a kinetically constrained process that is unlikely to lead to the rapid loss of CH4 in subterranean environments. We present results from a controlled laboratory experiment to support this claim. We then tested the microbial oxidation hypothesis with a set of mesocosm experiments that were conducted in two Vietnamese caves. Our results reveal that methanotrophic bacteria associated with cave rocks consume CH4 at a rate of 1.3–2.7 mg CH4 · m−2 · d−1. These CH4 oxidation rates equal or exceed what has been reported in other habitats, including agricultural systems, grasslands, deciduous forests, and Arctic tundra. Together, our results suggest that depleted concentrations of CH4 in caves are most likely due to microbial activity, not radiolysis as has been recently claimed. Microbial methanotrophy has the potential to oxidize CH4 not only in caves, but also in smaller-size open subterranean spaces, such as cracks, fissures, and other pores that are connected to and rapidly exchange with the atmosphere. Future studies are needed to understand how subterranean CH4 oxidation scales up to affect local, regional, and global CH4 cycling. © 2016 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85065
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology, Indiana University, Bloomington, IN, United States; Faculty of Geology, Vietnam National University, Hanoi, Viet Nam; Department of Microbiology, Vietnam National University, Hanoi, Viet Nam; Indiana Geological Survey, Indiana University, Bloomington, IN, United States; SARAD GmbH, Dresden, Germany; Department of Geological Sciences, Indiana University, Bloomington, IN, United States
Recommended Citation:
Lennon J.T.,Nguyễn-Thùy D.,Phạm T.M.,et al. Microbial contributions to subterranean methane sinks[J]. Geobiology,2017-01-01,15(2)