Oxidation and assimilation of atmospheric methane by soil methane oxidizers.

Applied and Environmental Microbiology
P RoslevK Henriksen

Abstract

The metabolism of atmospheric methane in a forest soil was studied by radiotracer techniques. Maximum (sup14)CH(inf4) oxidation (163.5 pmol of C cm(sup-3) h(sup-1)) and (sup14)C assimilation (50.3 pmol of C cm(sup-3) h(sup-1)) occurred at the A(inf2) horizon located 15 to 18 cm below the soil surface. At this depth, 31 to 43% of the atmospheric methane oxidized was assimilated into microbial biomass; the remaining methane was recovered as (sup14)CO(inf2). Methane-derived carbon was incorporated into all major cell macromolecules by the soil microorganisms (50% as proteins, 19% as nucleic acids and polysaccharides, and 5% as lipids). The percentage of methane assimilated (carbon conversion efficiency) remained constant at temperatures between 5 and 20(deg)C, followed by a decrease at 30(deg)C. The carbon conversion efficiency did not increase at methane concentrations between 1.7 and 1,000 ppm. In contrast, the overall methane oxidation activity increased at elevated methane concentrations, with an apparent K(infm) of 21 ppm (31 nM CH(inf4)) and a V(infmax) of 188 pmol of CH(inf4) cm(sup-3) h(sup-1). Methane oxidizers from soil depths with maximum methanotrophic activity respired approximately 1 to 3% of the assimilated methane-...Continue Reading

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Citations

Oct 31, 1998·Applied and Environmental Microbiology·J Gulledge, J P Schimel
Jan 4, 2008·Proceedings of the National Academy of Sciences of the United States of America·Tajul IslamNils-Kåre Birkeland
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Mar 20, 2010·FEMS Microbiology Reviews·Jeremy D SemrauSukhwan Yoon
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Jan 6, 2016·Environmental Science and Pollution Research International·Xiao-Meng WeiRuo-Chan Ma
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Jul 18, 2019·Environmental Monitoring and Assessment·A Sam KamalesonDelcy Rosy Nazareth
Jun 10, 2015·The ISME Journal·Mark TrimmerGrey Jonathan
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