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- W4387372233 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Microbial methane production is intimately linked to the biogeochemical cycling of iron, sulfur, and carbon in sedimentary environments. Sulfate-reducing microbes often outcompete methanogens for shared substrates. However, in a prior study at our field site, the Oak Ridge Reservation Field Research Center (ORR FRC) in Oak Ridge, TN, we observed co-occurring sulfate reduction and methanogenesis at 100–150 cm depth where iron (Fe) oxides of varying crystallinities were also detected. Fe oxides are known to act as electron conduits for direct interspecies electron transport (DIET) between syntrophic partners and can connect the metabolisms of methanogens with syntrophic Fe-reducing microbes in nature. However, whether the nature of Fe oxides can influence electron transfer reactions between sulfate-reducing microbes and methanogens is less understood. In this study, we utilized a microbial community enriched from ORR FRC vadose zone sediment to demonstrate the effects of Fe oxides of varying crystallinities on sulfate reduction and methanogenesis. We hypothesized that more crystalline Fe oxides facilitate the co-existence of sulfate-reducers and methanogens. Communities enriched from subsurface sediments produced methane when amended with crystalline hematite but not when amended with the amorphous, short range-ordered (SRO) ferrihydrite. Furthermore, Fe reduction occurred only in incubations amended with SRO ferrihydrite, indicating how poorly crystalline Fe oxides potentially contribute to the dynamic redox nature of the subsurface sediments. Microbial communities enriched during these incubations were composed of several taxa commonly associated with iron and sulfate reduction, fermentation, and methanogenesis, consistent with our geochemical data. Overall, the results from this work deepen our understanding of the role of Fe oxides in extracellular electron transfer, thereby mediating anaerobic metabolisms in the terrestrial subsurface environment." @default.
- W4387372233 created "2023-10-06" @default.
- W4387372233 date "2023-10-05" @default.
- W4387372233 modified "2023-10-06" @default.
- W4387372233 title "Reply on CC1" @default.
- W4387372233 doi "https://doi.org/10.5194/bg-2023-174-cc2" @default.
- W4387372233 hasPublicationYear "2023" @default.
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