{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,11]],"date-time":"2026-03-11T21:42:14Z","timestamp":1773265334921,"version":"3.50.1"},"reference-count":92,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,3,11]],"date-time":"2026-03-11T00:00:00Z","timestamp":1773187200000},"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. Plant Sci."],"abstract":"<jats:p>\n                    Research on greenhouse gas (GHG) fluxes has predominantly focused on subtropical soils, with far less attention given to emissions from tree stems. In particular, year-long simultaneous measurements of both soil and tree stem fluxes in these forests are lacking, and data on standing dead trees is exceptionally scarce. We determined the dynamics of standing dead and live tree stems, and soil CH\n                    <jats:sub>4<\/jats:sub>\n                    , N\n                    <jats:sub>2<\/jats:sub>\n                    O and CO\n                    <jats:sub>2<\/jats:sub>\n                    fluxes in a subtropical forest. We determined GHG fluxes from standing dead and live tree stems with three different tree heights (10 cm, 50 cm and 150 cm) of\n                    <jats:italic>Cunninghamia lanceolata<\/jats:italic>\n                    from January 2023 to December 2024 and subjected to analysis by gas chromatography. Measurements of environmental parameters were conducted in tandem with those of fluxes and xylem sap flow. Live tree stems contributed less to the annual GHG dynamics than standing dead trees. Live and standing dead tree stems generally acted as net annual sources of CH\n                    <jats:sub>4<\/jats:sub>\n                    , N\n                    <jats:sub>2<\/jats:sub>\n                    O, and CO\n                    <jats:sub>2<\/jats:sub>\n                    . Tree stem GHG fluxes decreased with decreasing precipitation. Soil was a sink of CH\n                    <jats:sub>4<\/jats:sub>\n                    , but a net CO\n                    <jats:sub>2<\/jats:sub>\n                    and N\n                    <jats:sub>2<\/jats:sub>\n                    O source. Isolated emission peaks dominated the temporal dynamics of stem CH\n                    <jats:sub>4<\/jats:sub>\n                    , N\n                    <jats:sub>2<\/jats:sub>\n                    O, and CO\n                    <jats:sub>2<\/jats:sub>\n                    fluxes and significantly contributed to the net annual fluxes. The CH\n                    <jats:sub>4<\/jats:sub>\n                    , N\n                    <jats:sub>2<\/jats:sub>\n                    O, and CO\n                    <jats:sub>2<\/jats:sub>\n                    efflux from both live and standing dead tree stems exhibited a similar seasonal trend. The status (live or dead) and height of the trees significantly influenced stem GHG dynamics. During the study, CH\n                    <jats:sub>4<\/jats:sub>\n                    emissions from tree stems (across different heights and precipitation conditions) offset an estimated 55.61~60.03% of the soil\u2019s CH\n                    <jats:sub>4<\/jats:sub>\n                    sink capacity. Here, we demonstrate for the first time a strong correlation between stem greenhouse gas fluxes and sap flow in subtropical forests. The stem fluxes of CH\n                    <jats:sub>4<\/jats:sub>\n                    in live and standing dead trees represented a combination of soil-derived and stem-produced methane, whereas CO\n                    <jats:sub>2<\/jats:sub>\n                    and N\n                    <jats:sub>2<\/jats:sub>\n                    O fluxes were primarily soil-derived.\n                  <\/jats:p>","DOI":"10.3389\/fpls.2026.1753330","type":"journal-article","created":{"date-parts":[[2026,3,11]],"date-time":"2026-03-11T05:37:04Z","timestamp":1773207424000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Precipitation and wood type determines stem and soil greenhouse gas fluxes in a subtropical forest"],"prefix":"10.3389","volume":"17","author":[{"given":"Guanghui","family":"Yang","sequence":"first","affiliation":[{"name":"The School of Hydraulic Engineering, Jiangxi University of Water Resources and Electric Power","place":["Nanchang, China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wanchen","family":"Xu","sequence":"additional","affiliation":[{"name":"School of Soil and Water Conservation, Jiangxi University of Water Resources and Electric Power","place":["Nanchang, China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wanyu","family":"Ning","sequence":"additional","affiliation":[{"name":"School of Soil and Water Conservation, Jiangxi University of Water Resources and Electric Power","place":["Nanchang, China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Men","family":"Jia","sequence":"additional","affiliation":[{"name":"School of Soil and Water Conservation, Jiangxi University of Water Resources and Electric Power","place":["Nanchang, China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pei","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Soil and Water Conservation, Jiangxi University of Water Resources and Electric Power","place":["Nanchang, China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuanqiu","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Silviculture, Co-Innovation Center of Jiangxi Typical Trees Cultivation and Utilization, College of Forestry, Jiangxi Agricultural University","place":["Nanchang, China"]},{"name":"Lushan Nature Reserve of Jiangxi, Lushan Mountain National Forest Ecological Station","place":["Jiujiang, China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chunsheng","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Soil and Water Conservation, Jiangxi University of Water Resources and Electric Power","place":["Nanchang, China"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1965","published-online":{"date-parts":[[2026,3,11]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"140","DOI":"10.1111\/pce.14718","article-title":"Model of methane transport in tree stems: case study of sap flow and radial diffusion","volume":"47","author":"Anttila","year":"2024","journal-title":"Plant. 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