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Article Dans Une Revue Global Change Biology Année : 2023

Long‐term elevated precipitation induces grassland soil carbon loss via microbe‐plant–soil interplay

Mengmeng Wang
Xin Sun
Baichuan Cao
Nona Chiariello
  • Fonction : Auteur
Kathryn Docherty
  • Fonction : Auteur
Christopher Field
Qun Gao
Jessica Gutknecht
Xue Guo
Genhe He
  • Fonction : Auteur
Bruce Hungate
Jiesi Lei
Xavier Le Roux
Zhou Shi
Wensheng Shu
Mengting Yuan
  • Fonction : Auteur
Jizhong Zhou
  • Fonction : Auteur
Yunfeng Yang
  • Fonction : Auteur

Résumé

Abstract Global climate models predict that the frequency and intensity of precipitation events will increase in many regions across the world. However, the biosphere‐climate feedback to elevated precipitation (eP) remains elusive. Here, we report a study on one of the longest field experiments assessing the effects of eP, alone or in combination with other climate change drivers such as elevated CO 2 (eCO 2 ), warming and nitrogen deposition. Soil total carbon (C) decreased after a decade of eP treatment, while plant root production decreased after 2 years. To explain this asynchrony, we found that the relative abundances of fungal genes associated with chitin and protein degradation increased and were positively correlated with bacteriophage genes, suggesting a potential viral shunt in C degradation. In addition, eP increased the relative abundances of microbial stress tolerance genes, which are essential for coping with environmental stressors. Microbial responses to eP were phylogenetically conserved. The effects of eP on soil total C, root production, and microbes were interactively affected by eCO 2 . Collectively, we demonstrate that long‐term eP induces soil C loss, owing to changes in microbial community composition, functional traits, root production, and soil moisture. Our study unveils an important, previously unknown biosphere‐climate feedback in Mediterranean‐type water‐limited ecosystems, namely how eP induces soil C loss via microbe‐plant–soil interplay.
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Dates et versions

hal-04276539 , version 1 (09-11-2023)

Identifiants

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Mengmeng Wang, Xin Sun, Baichuan Cao, Nona Chiariello, Kathryn Docherty, et al.. Long‐term elevated precipitation induces grassland soil carbon loss via microbe‐plant–soil interplay. Global Change Biology, 2023, 29 (18), pp.5429-5444. ⟨10.1111/gcb.16811⟩. ⟨hal-04276539⟩
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