Drought-induced peatland carbon loss exacerbated by elevated CO2 and warming
La perte de carbone des tourbières induite par la sécheresse est exacerbée par l'augmentation du CO2 et le réchauffement climatique
Quan, Quan ; Zhou, Jian ; Hanson, Paul J. ; Ricciuto, Daniel ; Sebestyen, Stephen D. ; Weston, David J. ; Chanton, Jeffrey P. ; Wilson, Rachel M. ; Kostka, Joel E. ; Zhou, Yu ; Wei, Ning ; Jiang, Lifen ; Mayes, Melanie A. ; Stelling, Jonathan M. ; Richardson, Andrew D. ; Dusenge, Mirindi Eric ; Way, Danielle ; Warren, Jeffrey M. ; Luo, Yiqi
Année de publication
2025
Extreme drought events are predicted to increase with climate change, yet their impacts on ecosystem carbon dynamics under warming and elevated carbon dioxide (eCO2) remain unclear. In a peatland experiment with five warming treatments each under ambient carbon dioxide (aCO2) and eCO2 (+500 parts per million), a 2-month extreme drought in 2021 reduced net ecosystem productivity by 444.0 ± 65.8 and 736.6 ± 57.8 grams of carbon per square meter at +9°C under aCO2 and eCO2, respectively?228.6 ± 56.8% and 381.9 ± 83.4% of the reduction at +0°C under aCO2. This exacerbation was driven by warming-induced water table decline, prolonged low water tables, and CO2-enhanced substrate availability through increased plant carbon inputs. Findings indicate that future climate will greatly amplify carbon loss during extreme drought, reinforcing positive carbon-climate feedbacks.</div>
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