Methanogenesis in oxygenated soils is a substantial fraction of wetland methane emissions.

Autor:	Angle JC; Department of Microbiology, The Ohio State University, Columbus, OH, 43210, USA., Morin TH; Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH, 43210, USA.; Environmental Science Graduate Program, The Ohio State University, Columbus, OH, 43210, USA., Solden LM; Department of Microbiology, The Ohio State University, Columbus, OH, 43210, USA., Narrowe AB; Department of Integrative Biology, University of Colorado Denver, Denver, CO, 80217, USA., Smith GJ; Department of Microbiology, The Ohio State University, Columbus, OH, 43210, USA., Borton MA; Department of Microbiology, The Ohio State University, Columbus, OH, 43210, USA.; Environmental Science Graduate Program, The Ohio State University, Columbus, OH, 43210, USA., Rey-Sanchez C; Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH, 43210, USA.; Environmental Science Graduate Program, The Ohio State University, Columbus, OH, 43210, USA., Daly RA; Department of Microbiology, The Ohio State University, Columbus, OH, 43210, USA., Mirfenderesgi G; Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH, 43210, USA., Hoyt DW; Pacific Northwest National Laboratory, Richland, WA, 99352, USA., Riley WJ; Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA., Miller CS; Department of Integrative Biology, University of Colorado Denver, Denver, CO, 80217, USA., Bohrer G; Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH, 43210, USA.; Environmental Science Graduate Program, The Ohio State University, Columbus, OH, 43210, USA., Wrighton KC; Department of Microbiology, The Ohio State University, Columbus, OH, 43210, USA. wrighton.1@osu.edu.; Environmental Science Graduate Program, The Ohio State University, Columbus, OH, 43210, USA. wrighton.1@osu.edu.
Jazyk:	angličtina
Zdroj:	Nature communications [Nat Commun] 2017 Nov 16; Vol. 8 (1), pp. 1567. Date of Electronic Publication: 2017 Nov 16.
DOI:	10.1038/s41467-017-01753-4
Abstrakt:	The current paradigm, widely incorporated in soil biogeochemical models, is that microbial methanogenesis can only occur in anoxic habitats. In contrast, here we show clear geochemical and biological evidence for methane production in well-oxygenated soils of a freshwater wetland. A comparison of oxic to anoxic soils reveal up to ten times greater methane production and nine times more methanogenesis activity in oxygenated soils. Metagenomic and metatranscriptomic sequencing recover the first near-complete genomes for a novel methanogen species, and show acetoclastic production from this organism was the dominant methanogenesis pathway in oxygenated soils. This organism, Candidatus Methanothrix paradoxum, is prevalent across methane emitting ecosystems, suggesting a global significance. Moreover, in this wetland, we estimate that up to 80% of methane fluxes could be attributed to methanogenesis in oxygenated soils. Together, our findings challenge a widely held assumption about methanogenesis, with significant ramifications for global methane estimates and Earth system modeling.
Databáze:	MEDLINE
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