期刊
SCIENCE
卷 374, 期 6569, 页码 894-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abg0241
关键词
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资金
- NSF [EAR 1322058]
- NASA
- NASA Astrobiology Institute
- L'Oreal USA For Women in Science fellowship
- L'Oreal-UNESCO FWIS International Rising Talent Endowment
- ACS award [PRF-53747-ND2]
Microbial degradation of coal may limit microbial methane production, with deep biosphere communities potentially involved in the transformation of plant matter to coal. The abundance of methoxyl groups influences coal-bed methane yield, and carbon isotopic enrichments from microbial methylotrophy explain the carbon-13 content differences between microbial methane and coals or conventional hydrocarbon deposits.
Microbial coal-bed methane is an important economic resource and source of a potent greenhouse gas, but controls on its formation are poorly understood. To test whether the microbial degradability of coal limits microbial methane, we monitored methoxyl group demethylation-a reaction that feeds methanogenesis-in a global sample suite ranging in maturity from wood to bituminous coal. Carbon isotopic compositions of residual methoxyl groups were inconsistent with a thermal reaction, instead implying a substrate-limited biologic process. This suggests that deep biosphere communities participated in transforming plant matter to coal on geologic time scales and that methoxyl abundance influences coal-bed methane yield. Carbon isotopic enrichments resulting from microbial methylotrophy also explain an enigmatic offset in the carbon-13 content of microbial methane from coals and conventional hydrocarbon deposits.
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