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Article Dans Une Revue Nature Geoscience Année : 2024

Enhanced response of soil respiration to experimental warming upon thermokarst formation

Guanqin Wang
Yunfeng Peng
Leiyi Chen
Benjamin W Abbott
Luyao Kang
  • Fonction : Auteur
Yang Liu
  • Fonction : Auteur
Qinlu Li
  • Fonction : Auteur
Josep Peñuelas
Shuqi Qin
  • Fonction : Auteur
Pete Smith
Yutong Song
  • Fonction : Auteur
Jens Strauss
Jun Wang
  • Fonction : Auteur
Bin Wei
  • Fonction : Auteur
Jianchun Yu
  • Fonction : Auteur
Dianye Zhang
  • Fonction : Auteur
Yuanhe Yang

Résumé

Abstract As global temperatures continue to rise, a key uncertainty of terrestrial carbon (C)–climate feedback is the rate of C loss upon abrupt permafrost thaw. This type of thawing—termed thermokarst—may in turn accelerate or dampen the response of microbial degradation of soil organic matter and carbon dioxide (CO 2 ) release to climate warming. However, such impacts have not yet been explored in experimental studies. Here, by experimentally warming three thermo-erosion gullies in an upland thermokarst site combined with incubating soils from five additional thermokarst-impacted sites on the Tibetan Plateau, we investigate how warming responses of soil CO 2 release would change upon upland thermokarst formation. Our results show that warming-induced increase in soil CO 2 release is ~5.5 times higher in thermokarst features than the adjacent non-thermokarst landforms. This larger warming response is associated with the lower substrate quality and higher abundance of microbial functional genes for recalcitrant C degradation in thermokarst-affected soils. Taken together, our study provides experimental evidence that warming-associated soil CO 2 loss becomes stronger upon abrupt permafrost thaw, which could exacerbate the positive soil C–climate feedback in permafrost-affected regions.
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Dates et versions

hal-04572958 , version 1 (13-05-2024)

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Guanqin Wang, Yunfeng Peng, Leiyi Chen, Benjamin W Abbott, Philippe Ciais, et al.. Enhanced response of soil respiration to experimental warming upon thermokarst formation. Nature Geoscience, 2024, ⟨10.1038/s41561-024-01440-2⟩. ⟨hal-04572958⟩
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