ArticleProceedings of the National Academy of Sciences of the United States of America2026
Spatially resolved denitrification coupled with methane and arsenite oxidation at the millimeter-scale straw-soil interface.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Straw return reshapes the biogeochemical processes in paddy soils by driving microbial transformation of key elements. Despite growing awareness of these individual processes, the integration of these processes under millimeter-scale spatiotemporal heterogeneity remains unclear. Combining high-resolution geochemical profiling with multiomics, we revealed that straw addition altered the depth-dependent dynamics of arsenic, carbon, and nitrogen, establishing a sophisticated three-layer microbial stratification. We identified 1) an 18 mm organic matter (OM)-rich layer extending from the straw layer, which serves as a methanogenic epicenter co-occurring with active nitrogen fixation microbes; 2) an overlying layer dominated by aerobic methane oxidation and denitrification microbes; and 3) a deeper substraw layer dominated by anaerobic arsenite oxidation and denitrification microbes. Significantly positively correlated abundances of transcribed
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