产甲烷
甲烷
再矿化
环境化学
产甲烷菌
吸附
沉积物
自行车
化学
碳循环
总有机碳
生态学
地质学
生态系统
生物
无机化学
有机化学
氟化物
考古
古生物学
历史
作者
Ke-Qing Xiao,Oliver W. Moore,Peyman Babakhani,Lisa Curti,Caroline L. Peacock
标识
DOI:10.1038/s41467-022-30422-4
摘要
Minerals are widely proposed to protect organic carbon from degradation and thus promote the persistence of organic carbon in soils and sediments, yet a direct link between mineral adsorption and retardation of microbial remineralisation is often presumed and a mechanistic understanding of the protective preservation hypothesis is lacking. We find that methylamines, the major substrates for cryptic methane production in marine surface sediment, are strongly adsorbed by marine sediment clays, and that this adsorption significantly reduces their concentrations in the dissolved pool (up to 40.2 ± 0.2%). Moreover, the presence of clay minerals slows methane production and reduces final methane produced (up to 24.9 ± 0.3%) by a typical methylotrophic methanogen-Methanococcoides methylutens TMA-10. Near edge X-ray absorption fine structure spectroscopy shows that reversible adsorption and occlusive protection of methylamines in clay interlayers are responsible for the slow-down and reduction in methane production. Here we show that mineral-OC interactions strongly control methylotrophic methanogenesis and potentially cryptic methane cycling in marine surface sediments.
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