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Drought-induced peatland carbon loss exacerbated by elevated CO2 and warming
Quan Quan1, Jian Zhou1, Paul J Hanson2
1Soil and Crop Sciences Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, USA.
None:
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.
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