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Wetlands can form within these depressions, leading to changes in organic matter decomposition and gas fluxes (CO\n                    <jats:sub>2<\/jats:sub>\n                    , CH\n                    <jats:sub>4<\/jats:sub>\n                    , N\n                    <jats:sub>2<\/jats:sub>\n                    O, NH\n                    <jats:sub>3<\/jats:sub>\n                    ). Thermokarst wetlands tend to be dominated by graminoids, while surrounding upland tussock tundra tends to be dominated by mixed communities of shrubs and graminoids. To investigate how thermokarst alters the land\u2010atmosphere exchange of C and N gases in Arctic tundra, we analyzed soil, porewater, above\u2010 and belowground biomass, and measured gas fluxes across dominant plant functional types (PFTs) within a lowland thermokarst wetland and adjacent upland tussock tundra. Both locations were overall sinks of CO\n                    <jats:sub>2<\/jats:sub>\n                    , sources of CH\n                    <jats:sub>4<\/jats:sub>\n                    , and sources of both N\n                    <jats:sub>2<\/jats:sub>\n                    O and NH\n                    <jats:sub>3<\/jats:sub>\n                    . We found that thermokarst wetlands emitted enough CH\n                    <jats:sub>4<\/jats:sub>\n                    to generate a positive radiative forcing in CO\n                    <jats:sub>2<\/jats:sub>\n                    equivalents (+1.2\u2009\u03bcmol\u2009m\n                    <jats:sup>\u22122<\/jats:sup>\n                    \u2009s\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u2009CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010eq), counteracting the high CO\n                    <jats:sub>2<\/jats:sub>\n                    uptake. In contrast, the upland tussock tundra had a net negative radiative forcing (\u22121.2\u2009\u03bcmol\u2009m\n                    <jats:sup>\u22122<\/jats:sup>\n                    \u2009s\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u2009CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010eq). Differences in gas flux and soil chemistry between upland and lowland are primarily driven by flooded conditions present in thermokarst wetland. Additionally, root biomass from graminoids across both lowlands and uplands significantly correlated with CH\n                    <jats:sub>4<\/jats:sub>\n                    fluxes, supporting previous observations of plant\u2010mediated transport of CH\n                    <jats:sub>4<\/jats:sub>\n                    . Graminoid cover was correlated with increases in low molecular weight dissolved organic carbon, possibly associated with root exudates that fuel methanogenesis. Forb cover in the upland tussock tundra was significantly correlated with nine soil chemical variables, indicating that forbs may influence local soil chemistry or conversely, that soil chemistry controls where forbs grow. Overall, our findings indicate the variability in gas fluxes in the upland tussock tundra is partially controlled by PFT cover, while thermokarst wetlands emit enough CH\n                    <jats:sub>4<\/jats:sub>\n                    to counteract CO\n                    <jats:sub>2<\/jats:sub>\n                    uptake, with implications for carbon budget changes in Arctic systems.\n                  <\/jats:p>","DOI":"10.1111\/gcb.70667","type":"journal-article","created":{"date-parts":[[2025,12,23]],"date-time":"2025-12-23T09:28:28Z","timestamp":1766482108000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Changing Interactions Between Trace Gas Fluxes, Belowground Chemistry, and Plant Traits Across an Arctic Thermokarst Landscape"],"prefix":"10.1111","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1191-4484","authenticated-orcid":false,"given":"Sean","family":"Fettrow","sequence":"first","affiliation":[{"name":"Oak Ridge National Laboratory  Oak Ridge Tennessee USA"},{"name":"Colorado State University  Fort Collins Colorado USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2188-551X","authenticated-orcid":false,"given":"Verity","family":"Salmon","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory  Oak Ridge Tennessee USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2002-7337","authenticated-orcid":false,"given":"Joanne","family":"Childs","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory  Oak Ridge Tennessee USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3265-6691","authenticated-orcid":false,"given":"Benjamin","family":"Sulman","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory  Oak Ridge Tennessee USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8968-7344","authenticated-orcid":false,"given":"David","family":"Graham","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory  Oak Ridge Tennessee USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8293-3450","authenticated-orcid":false,"given":"Colleen M.","family":"Iversen","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory  Oak Ridge Tennessee USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9194-5493","authenticated-orcid":false,"given":"Elizabeth","family":"Herndon","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory  Oak Ridge Tennessee USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,12,23]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"publisher","DOI":"10.1890\/0012\u20109615"},{"key":"e_1_2_12_3_1","doi-asserted-by":"crossref","unstructured":"Berns\u2010Herrboldt E. 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