globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-013-9864-y
Scopus记录号: 2-s2.0-84897384394
论文题名:
Substrate limitation of sediment methane flux, methane oxidation and use of stable isotopes for assessing methanogenesis pathways in a small arctic lake
作者: Hershey A.E.; Northington R.M.; Whalen S.C.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 117, 期:2018-02-03
起始页码: 325
结束页码: 336
语种: 英语
英文关键词: Acetate limitation ; Arctic lake ; Isotopic fractionation effects ; Methanogenic pathways
Scopus关键词: acetate ; arctic environment ; assessment method ; climate change ; hypolimnion ; isotopic fractionation ; lacustrine deposit ; methane ; methanogenesis ; oxic conditions ; oxidation ; sediment chemistry ; sediment core ; stable isotope ; substrate ; water column ; Arctic
英文摘要: Among predicted impacts of climate change in the Arctic are greater thaw depth and shifts in vegetation patterns and hydrology that are likely to increase organic carbon and nutrient loading to lakes. We measured substrate limitation of sediment methane (CH4) flux, examined pathways of methanogenesis, and potential CH4 oxidation using stable isotope labeled acetate in intact sediment cores from arctic lake GTH 112 (68°40′20″N, 149°14′57″W). We hypothesized that the acetoclastic pathway would dominate methanogenesis, reflecting dissolved organic carbon supply from the surrounding landscape, and that sediment CH4 flux would be stimulated by addition of acetate. Experiments demonstrated acetate limitation of sediment CH4 flux with short-term CH4 flux response to availability of acetate, high rates of CH4 oxidation, and strong dominance of the acetoclastic over the hydrogenotrophic methanogenic pathway. The experiments also indicated that isotopic fractionation effects during isotope enrichment experiments are large during methanogenesis and can alter the methanogenic pathways being investigated. Under oxic conditions, CH4 oxidation at the sediment-water interface or in the water column is likely to account for much of diffusive CH4 flux, but under anoxic hypolimnetic conditions and increased substrate availability, conditions that are likely to occur with climate change, sediment CH4 flux will likely increase, with oxidation utilizing a smaller portion of sediment CH4 production. © 2013 Springer Science+Business Media Dordrecht.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83718
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 Biology, University of North Carolina at Greensboro, Greensboro, NC, 27412, United States; Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, United States; Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, United States

Recommended Citation:
Hershey A.E.,Northington R.M.,Whalen S.C.. Substrate limitation of sediment methane flux, methane oxidation and use of stable isotopes for assessing methanogenesis pathways in a small arctic lake[J]. Biogeochemistry,2014-01-01,117(2018-02-03)
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