Drought-induced peatland carbon loss exacerbated by elevated CO2 and warming

IF 45.8 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2025-10-23 DOI:10.1126/science.adv7104

Quan Quan, Jian Zhou, Paul J. Hanson, Daniel Ricciuto, Stephen D. Sebestyen, David J. Weston, Jeffrey P. Chanton, Rachel M. Wilson, Joel E. Kostka, Yu Zhou, Ning Wei, Lifen Jiang, Melanie A. Mayes, Jonathan M. Stelling, Andrew D. Richardson, Mirindi Eric Dusenge, Danielle Way, Jeffrey M. Warren, Yiqi Luo

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Abstract

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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二氧化碳浓度升高和气候变暖加剧了干旱导致的泥炭地碳损失

极端干旱事件预计将随着气候变化而增加，但它们对气候变暖和二氧化碳（eCO 2）升高下生态系统碳动态的影响尚不清楚。在环境二氧化碳（aCO 2）和eCO 2 （+ 500ppm）下分别进行5种增温处理的泥炭地实验中，2021年2个月的极端干旱使生态系统净生产力在+9°C和eCO 2下分别减少了444.0±65.8和736.6±57.8克碳/平方米，分别为+0°C下的228.6±56.8%和381.9±83.4%。这种加剧是由变暖引起的地下水位下降、低地下水位延长以及通过增加植物碳输入增加的CO 2增强的基质可利用性所驱动的。研究结果表明，未来气候将极大地放大极端干旱期间的碳损失，强化碳-气候正反馈。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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