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Article Dans Une Revue Nature Année : 2023

Microbial carbon use efficiency promotes global soil carbon storage

Feng Tao
Yuanyuan Huang
Bruce A Hungate
Stefano Manzoni
Serita D Frey
Michael W I Schmidt
Markus Reichstein
Nuno Carvalhais
Lifen Jiang
  • Fonction : Auteur
Johannes Lehmann
Ying-Ping Wang
Benjamin Z Houlton
  • Fonction : Auteur
Bernhard Ahrens
Umakant Mishra
  • Fonction : Auteur
Gustaf Hugelius
Toby D Hocking
  • Fonction : Auteur
Xingjie Lu
  • Fonction : Auteur
Zheng Shi
  • Fonction : Auteur
Kostiantyn Viatkin
  • Fonction : Auteur
Ronald Vargas
  • Fonction : Auteur
Yusuf Yigini
Christian Omuto
  • Fonction : Auteur
Ashish A Malik
Guillermo Peralta
  • Fonction : Auteur
Rosa Cuevas-Corona
  • Fonction : Auteur
Luciano E Di Paolo
  • Fonction : Auteur
Isabel Luotto
  • Fonction : Auteur
Cuijuan Liao
  • Fonction : Auteur
Yi-Shuang Liang
  • Fonction : Auteur
Vinisa S Saynes
  • Fonction : Auteur
Xiaomeng Huang
Yiqi Luo

Résumé

Soils store more carbon than other terrestrial ecosystems 1,2. How soil organic carbon (SOC) forms and persists remains uncertain 1,3 , which makes it challenging to understand how it will respond to climatic change 3,4. It has been suggested that soil microorganisms play an important role in SOC formation, preservation and loss 5-7. Although microorganisms affect the accumulation and loss of soil organic matter through many pathways 4,6,8-11 , microbial carbon use efficiency (CUE) is an integrative metric that can capture the balance of these processes 12,13. Although CUE has the potential to act as a predictor of variation in SOC storage, the role of CUE in SOC persistence remains unresolved 7,14,15. Here we examine the relationship between CUE and the preservation of SOC, and interactions with climate, vegetation and edaphic properties, using a combination of global-scale datasets, a microbial-process explicit model, data assimilation, deep learning and meta-analysis. We find that CUE is at least four times as important as other evaluated factors, such as carbon input, decomposition or vertical transport, in determining SOC storage and its spatial variation across the globe. In addition, CUE shows a positive correlation with SOC content. Our findings point to microbial CUE as a major determinant of global SOC storage. Understanding the microbial processes underlying CUE and their environmental dependence may help the prediction of SOC feedback to a changing climate.
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hal-04132307 , version 1 (19-06-2023)

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Feng Tao, Yuanyuan Huang, Bruce A Hungate, Stefano Manzoni, Serita D Frey, et al.. Microbial carbon use efficiency promotes global soil carbon storage. Nature, 2023, 618, pp.981-985. ⟨10.1038/s41586-023-06042-3⟩. ⟨hal-04132307⟩

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