globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12193
Scopus记录号: 2-s2.0-84979752347
论文题名:
Atmospheric CH4 oxidation by Arctic permafrost and mineral cryosols as a function of water saturation and temperature
作者: Stackhouse B.; Lau M.C.Y.; Vishnivetskaya T.; Burton N.; Wang R.; Southworth A.; Whyte L.; Onstott T.C.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2017
卷: 15, 期:1
起始页码: 94
结束页码: 111
语种: 英语
Scopus关键词: air-soil interaction ; anoxic conditions ; atmospheric chemistry ; chemical mass balance ; methane ; methanotrophy ; oxidation ; permafrost ; saturated medium ; soil temperature ; stable isotope ; thawing ; Arctic ; Axel Heiberg Island ; Canada ; Nunavut ; Queen Elizabeth Islands ; Methylocystaceae ; methane ; mineral ; water ; Arctic ; metabolism ; Nunavut ; oxidation reduction reaction ; permafrost ; temperature ; Arctic Regions ; Methane ; Minerals ; Nunavut ; Oxidation-Reduction ; Permafrost ; Temperature ; Water
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: The response of methanotrophic bacteria capable of oxidizing atmospheric CH4 to climate warming is poorly understood, especially for those present in Arctic mineral cryosols. The atmospheric CH4 oxidation rates were measured in microcosms incubated at 4 °C and 10 °C along a 1-m depth profile and over a range of water saturation conditions for mineral cryosols containing type I and type II methanotrophs from Axel Heiberg Island (AHI), Nunavut, Canada. The cryosols exhibited net consumption of ~2 ppmv CH4 under all conditions, including during anaerobic incubations. Methane oxidation rates increased with temperature and decreased with increasing water saturation and depth, exhibiting the highest rates at 10 °C and 33% saturation at 5 cm depth (260 ± 60 pmol CH4 gdw−1 d−1). Extrapolation of the CH4 oxidation rates to the field yields net CH4 uptake fluxes ranging from 11 to 73 μmol CH4 m−2 d−1, which are comparable to field measurements. Stable isotope mass balance indicates ~50% of the oxidized CH4 is incorporated into the biomass regardless of temperature or saturation. Future atmospheric CH4 uptake rates at AHI with increasing temperatures will be determined by the interplay of increasing CH4 oxidation rates vs. water saturation and the depth to the water table during summer thaw. © 2016 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85080
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Geosciences, Princeton University, Princeton, NJ, United States; The Center for Environmental Biotechnology, University of Tennessee, Knoxville, TN, United States; Department of Natural Resource Sciences, McGill University, Montreal, QC, Canada

Recommended Citation:
Stackhouse B.,Lau M.C.Y.,Vishnivetskaya T.,et al. Atmospheric CH4 oxidation by Arctic permafrost and mineral cryosols as a function of water saturation and temperature[J]. Geobiology,2017-01-01,15(1)
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