Tradeoff of CO2 and CH4 emissions from global peatlands under water-table drawdown

Yuanyuan Huang*, Phillipe Ciais, Yiqi Luo, Dan Zhu, Yingping Wang, Chunjing Qiu, Daniel S. Goll, Bertrand Guenet, David Makowski, Inge De Graaf, Jens Leifeld, Min Jung Kwon, Jing Hu, Laiye Qu

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

Water-table drawdown across peatlands increases carbon dioxide (CO2) and reduces methane (CH4) emissions. The net climatic effect remains unclear. Based on global observations from 130 sites, we found a positive (warming) net climate effect of water-table drawdown. Using a machine-learning-based upscaling approach, we predict that peatland water-table drawdown driven by climate drying and human activities will increase CO2 emissions by 1.13 (95% interval: 0.88–1.50) Gt yr−1 and reduce CH4 by 0.26 (0.14–0.52) GtCO2-eq yr−1, resulting in a net increase of greenhouse gas of 0.86 (0.36–1.36) GtCO2-eq yr−1 by the end of the twenty-first century under the RCP8.5 climate scenario. This drops to 0.73 (0.2–1.2) GtCO2-eq yr−1 under RCP2.6. Our results point to an urgent need to preserve pristine and rehabilitate drained peatlands to decelerate the positive feedback among water-table drawdown, increased greenhouse gas emissions and climate warming.

Original languageEnglish
Pages (from-to)618-622
Number of pages5
JournalNature Climate Change
Volume11
Issue number7
DOIs
Publication statusPublished - 7 Jun 2021

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