{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T17:11:01Z","timestamp":1790874661158,"version":"4.1.0"},"reference-count":67,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2025,4,24]],"date-time":"2025-04-24T00:00:00Z","timestamp":1745452800000},"content-version":"vor","delay-in-days":23,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100010661","name":"Horizon 2020 Framework Programme","doi-asserted-by":"publisher","award":["847504"],"award-info":[{"award-number":["847504"]}],"id":[{"id":"10.13039\/100010661","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Global Change Biology"],"published-print":{"date-parts":[[2025,4]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p>Drought events are increasing in frequency and intensity due to climate change, causing lasting impacts on plant communities and ecosystem functioning. In the sub\u2010arctic, climate is changing at a rate above the global average with amplifying effects on the carbon cycle. Drought\u2010induced shifts in the balance between productivity and respiration might have important implications for climate change feedbacks in these regions. However, little is known about how carbon fluxes in sub\u2010arctic ecosystems respond to drought, hampering predictions. Here, we test how two important but contrasting sub\u2010arctic ecosystem types, <jats:italic>Sphagnum<\/jats:italic> peatland and tundra heath, respond to experimental drought. Mesocosms were exposed to a full precipitation exclusion for 7\u2009weeks, decreasing gravimetric water content by 66% and 53% for <jats:italic>Sphagnum<\/jats:italic> peatland and tundra heath, respectively. Drought suppressed all CO<jats:sub>2<\/jats:sub> flux components. Gross primary productivity was on average reduced by 47% and 64%, and ecosystem respiration by 40% and 53% in <jats:italic>Sphagnum<\/jats:italic> peatland and tundra heath, respectively. Concomitantly with the ecosystem fluxes, leaf photosynthesis of the three most abundant vascular plant species per ecosystem type was on average suppressed by 40% (peatland) and 77% (tundra heath). Drought resulted in high plant mortality, with up to 54% (peatland) and 73% (tundra heath) dead shoots, which might represent a significant legacy effect suppressing CO<jats:sub>2<\/jats:sub> uptake in subsequent growing seasons. In summary, tundra heath was overall more responsive to drought than peatland. This differential sensitivity, previously unaccounted for, might be important in the future under intensifying drought events. Considering that tundra heath covers more than half of the sub\u2010arctic land area, its drought responsiveness might induce significant reductions in total arctic net CO<jats:sub>2<\/jats:sub> uptake. This would move the arctic carbon balance further toward a net CO<jats:sub>2<\/jats:sub> source.<\/jats:p>","DOI":"10.1111\/gcb.70210","type":"journal-article","created":{"date-parts":[[2025,4,24]],"date-time":"2025-04-24T11:35:23Z","timestamp":1745494523000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Stronger Drought Response of <scp>CO<sub>2<\/sub><\/scp> Fluxes in Tundra Heath Compared to <i>Sphagnum<\/i> Peatland in the Sub\u2010Arctic"],"prefix":"10.1111","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-6630-4571","authenticated-orcid":false,"given":"Valentin","family":"Heinzelmann","sequence":"first","affiliation":[{"name":"Amsterdam Institute for Life and Environment, Section Systems Ecology Vrije Universiteit Amsterdam  Amsterdam the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julia","family":"Marinissen","sequence":"additional","affiliation":[{"name":"Amsterdam Institute for Life and Environment, Section Systems Ecology Vrije Universiteit Amsterdam  Amsterdam the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rien","family":"Aerts","sequence":"additional","affiliation":[{"name":"Amsterdam Institute for Life and Environment, Section Systems Ecology Vrije Universiteit Amsterdam  Amsterdam the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2346-1585","authenticated-orcid":false,"given":"J. Hans C.","family":"Cornelissen","sequence":"additional","affiliation":[{"name":"Amsterdam Institute for Life and Environment, Section Systems Ecology Vrije Universiteit Amsterdam  Amsterdam the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stef","family":"Bokhorst","sequence":"additional","affiliation":[{"name":"Amsterdam Institute for Life and Environment, Section Systems Ecology Vrije Universiteit Amsterdam  Amsterdam the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,4,24]]},"reference":[{"key":"e_1_2_10_2_1","volume-title":"Arctic Climate Change Update 2021: Key Trends and Impacts. Summary for Policy\u2010Makers","author":"AMAP","year":"2021"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586\u2010018\u20100539\u20107"},{"key":"e_1_2_10_4_1","volume-title":"nlme: Linear and Nonlinear Mixed Effects Models","author":"Bates J. 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