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Environmental drivers of increased ecosystem respiration in a warming tundra
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Forest Ecology and Management Group (FORECOMAN), Department of Earth and Environmental Sciences, KU Leuven, Leuven, Belgium.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Department of Spatial Sciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Praha-Suchdol, Czech Republic.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.ORCID iD: 0000-0002-6206-7150
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2024 (English)In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 629, no 8010, p. 105-113Article in journal (Refereed) Published
Abstract [en]

Arctic and alpine tundra ecosystems are large reservoirs of organic carbon1,2. Climate warming may stimulate ecosystem respiration and release carbon into the atmosphere3,4. The magnitude and persistency of this stimulation and the environmental mechanisms that drive its variation remain uncertain5–7. This hampers the accuracy of global land carbon–climate feedback projections7,8. Here we synthesize 136 datasets from 56 open-top chamber in situ warming experiments located at 28 arctic and alpine tundra sites which have been running for less than 1 year up to 25 years. We show that a mean rise of 1.4 °C [confidence interval (CI) 0.9–2.0 °C] in air and 0.4 °C [CI 0.2–0.7 °C] in soil temperature results in an increase in growing season ecosystem respiration by 30% [CI 22–38%] (n = 136). Our findings indicate that the stimulation of ecosystem respiration was due to increases in both plant-related and microbial respiration (n = 9) and continued for at least 25 years (n = 136). The magnitude of the warming effects on respiration was driven by variation in warming-induced changes in local soil conditions, that is, changes in total nitrogen concentration and pH and by context-dependent spatial variation in these conditions, in particular total nitrogen concentration and the carbon:nitrogen ratio. Tundra sites with stronger nitrogen limitations and sites in which warming had stimulated plant and microbial nutrient turnover seemed particularly sensitive in their respiration response to warming. The results highlight the importance of local soil conditions and warming-induced changes therein for future climatic impacts on respiration.

Place, publisher, year, edition, pages
Springer Nature, 2024. Vol. 629, no 8010, p. 105-113
National Category
Climate Research
Identifiers
URN: urn:nbn:se:umu:diva-223836DOI: 10.1038/s41586-024-07274-7PubMedID: 38632407Scopus ID: 2-s2.0-85190691054OAI: oai:DiVA.org:umu-223836DiVA, id: diva2:1855281
Funder
Swedish Research Council, 2018-04004Knut and Alice Wallenberg Foundation, 2020.0126Swedish Research Council Formas, 2013-655Swedish Research Council Formas, 2021-02449EU, European Research CouncilEU, Horizon 2020Academy of FinlandThe Research Council of NorwayAvailable from: 2024-04-30 Created: 2024-04-30 Last updated: 2024-06-19Bibliographically approved

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Maes, S.L.Dietrich, J.Schwieger, S.Gavazov, K.Olofsson, J.Walz, J.Sarneel, J. M.Dorrepaal, E.

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