{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T06:09:14Z","timestamp":1789711754226,"version":"4.0.1"},"reference-count":50,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T00:00:00Z","timestamp":1789689600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Microbiol."],"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>\n                      Paddy soils represent key biogeochemical interfaces linking arsenic (As) transformation and carbon (C) cycling. Dimethylarsenate (DMAs), a widespread organoarsenic contaminant in rice paddies, can alter methane (CH\n                      <jats:sub>4<\/jats:sub>\n                      ) dynamics, but the underlying mechanisms based on dissolved organic matter (DOM)-microbe interaction and the mitigation potential of biochar still remained insufficiently understood.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Here, we investigated As biogeochemistry, CH\n                      <jats:sub>4<\/jats:sub>\n                      emissions, DOM quantity and composition, microbial community assembly and functional gene variations through a 98-day microcosm incubation experiment using paddy soil amended with DMAs alone and DMAs combined with biochar.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      We found that DMAs greatly promoted CH\u2084 emissions in a dose-dependent manner, with the DMAs120 treatment increasing cumulative CH\u2084 emissions by 60.4% relative to the control. DMAs underwent significant biotransformation, declining from 98.7% on the 7th day to 26.2% of the total As by day 98. Porewater DOC concentrations were significantly increased by up to 1.81-fold (DMAs120, day 28). PARAFAC analysis revealed that DMAs shifted DOM composition toward labile protein-like fractions, with tryptophan-like (C2) and tyrosine-like (C3) components increasing while microbial humic-like (C1) and terrestrial humic-like (C4) fractions decreased. Such labile DOM precisely matched substrate requirements of enriched anaerobic fermentative microbes, establishing synergistic metabolic networks to supply methanogenic precursors. DMAs markedly increased\n                      <jats:italic>mcrA<\/jats:italic>\n                      gene abundance by 4.2\u20137.6 times with negligible change in\n                      <jats:italic>pmoA<\/jats:italic>\n                      , confirming stimulated methanogenesis rather than suppressed oxidation. By contrast, biochar effectively decreased % DMAs in porewater, reducing CH\n                      <jats:sub>4<\/jats:sub>\n                      emissions by 54.3% after 2% biochar amendment. Biochar also decreased DOC concentrations and protein-like DOM (C2, C3), reducing bioavailable substrates for methanogens. Furthermore, biochar suppressed\n                      <jats:italic>mcrA<\/jats:italic>\n                      gene abundances by 12.7\u201381.3%, while increased that of\n                      <jats:italic>pmoA<\/jats:italic>\n                      gene by 7.1\u20137.5 times, as well as increased porewater As(V) and enriched ammonia-oxidizing\n                      <jats:italic>Candidatus_Nitrosopelagicus<\/jats:italic>\n                      to potentially or indirectly stimulate anaerobic CH\u2084 oxidation.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Discussion<\/jats:title>\n                    <jats:p>\n                      These results establish mechanistic connections between DMAs biotransformation, DOM turnover and CH\n                      <jats:sub>4<\/jats:sub>\n                      production in paddy soils, and verify that biochar restructures DOM-microbe interactions to mitigate DMAs-stimulated CH\n                      <jats:sub>4<\/jats:sub>\n                      emissions. This study deepens insights into As-C biogeochemical coupling and offers practical support for simultaneous As remediation and greenhouse gas control in paddy ecosystems.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fmicb.2026.1958612","type":"journal-article","created":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T05:36:12Z","timestamp":1789709772000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Biochar mitigates dimethylarsenate-stimulated methane emissions mediated by DOM-microbe interactions in paddy soils"],"prefix":"10.3389","volume":"17","author":[{"given":"Yukun","family":"Kang","sequence":"first","affiliation":[{"name":"Key Laboratory of Urban Agriculture in North China, Ministry of Agriculture and Rural Affairs, Beijing University of Agriculture","place":["Beijing, China"]},{"name":"College of Bioscience and Resources Environment, Beijing University of Agriculture","place":["Beijing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lei","family":"Jin","sequence":"additional","affiliation":[{"name":"Key Laboratory of Urban Agriculture in North China, Ministry of Agriculture and Rural Affairs, Beijing University of Agriculture","place":["Beijing, China"]},{"name":"College of Bioscience and Resources Environment, Beijing University of Agriculture","place":["Beijing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiyang","family":"Du","sequence":"additional","affiliation":[{"name":"Key Laboratory of Urban Agriculture in North China, Ministry of Agriculture and Rural Affairs, Beijing University of Agriculture","place":["Beijing, China"]},{"name":"College of Bioscience and Resources Environment, Beijing University of Agriculture","place":["Beijing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinpeng","family":"Lv","sequence":"additional","affiliation":[{"name":"Transport Planning and Research Institute, Ministry of Transport","place":["Beijing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi","family":"Tang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Urban Agriculture in North China, Ministry of Agriculture and Rural Affairs, Beijing University of Agriculture","place":["Beijing, China"]},{"name":"College of Bioscience and Resources Environment, Beijing University of Agriculture","place":["Beijing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jian","family":"Zhou","sequence":"additional","affiliation":[{"name":"Key Laboratory of Urban Agriculture in North China, Ministry of Agriculture and Rural Affairs, Beijing University of Agriculture","place":["Beijing, China"]},{"name":"College of Bioscience and Resources Environment, Beijing University of Agriculture","place":["Beijing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Urban Agriculture in North China, Ministry of Agriculture and Rural Affairs, Beijing University of Agriculture","place":["Beijing, China"]},{"name":"College of Bioscience and Resources Environment, Beijing University of Agriculture","place":["Beijing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuping","family":"Yang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Urban Agriculture in North China, Ministry of Agriculture and Rural Affairs, Beijing University of Agriculture","place":["Beijing, China"]},{"name":"College of Bioscience and Resources Environment, Beijing University of Agriculture","place":["Beijing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuehui","family":"Jia","sequence":"additional","affiliation":[{"name":"Key Laboratory of Urban Agriculture in North China, Ministry of Agriculture and Rural Affairs, Beijing University of Agriculture","place":["Beijing, China"]},{"name":"College of Bioscience and Resources Environment, Beijing University of Agriculture","place":["Beijing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,9,18]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","first-page":"125762","DOI":"10.1016\/j.watres.2026.125762","article-title":"Long-term fertilization regimes mitigate dissolved organic matter leaching and alter its chemodiversity in agricultural soil leachate","volume":"297","author":"An","year":"2026","journal-title":"Water Res."},{"key":"ref2","doi-asserted-by":"publisher","first-page":"108444","DOI":"10.1016\/j.soilbio.2021.108444","article-title":"Shedding light on the functional role of the Ignavibacteria in Italian rice field soil: a meta-genomic\/transcriptomic analysis","volume":"163","author":"Bei","year":"2021","journal-title":"Soil Biol. 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