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Important role of Fe oxides in global soil carbon stabilization and stocks

Author

Listed:
  • Nan Jia

    (Chinese Academy of Sciences
    Chinese Academy of Sciences
    Cele National Station of Observation and Research for Desert-Grassland Ecosystems
    University of Chinese Academy of Sciences)

  • Lei Li

    (Chinese Academy of Sciences
    Chinese Academy of Sciences
    Cele National Station of Observation and Research for Desert-Grassland Ecosystems
    University of Chinese Academy of Sciences)

  • Hui Guo

    (College of Water Resources)

  • Mingyu Xie

    (Chinese Academy of Sciences
    Chinese Academy of Sciences
    Cele National Station of Observation and Research for Desert-Grassland Ecosystems
    University of Chinese Academy of Sciences)

Abstract

Iron (Fe) oxides can interact with soil organic carbon (SOC) to form Fe-bound organic carbon (OC-Fe), which strongly promotes SOC protection, mitigating global climate change. However, the global patterns and factors controlling OC-Fe are unclear. Here, we conducted a meta-analysis of 3,395 globally distributed soil profiles to reveal the role of Fe-Al oxides in global soil carbon stabilization and stocks. The global OC-Fe stock in topsoil is 233 PgC, accounting for 33 ± 15% of the total SOC stock. A substantial OC-Fe deficit (difference between OC-Fe and OC-Femax) was observed at the equator and at mid-latitudes. Our findings suggest that mineral factors should be incorporated into soil carbon models to improve model predictions. Although there are uncertainties in current OC-Fe extraction method, the global distribution of OC-Fe and OC-Femax constitutes a vital resource for future research targeting carbon cycling issues and offers innovative strategies for global soil carbon sequestration initiatives.

Suggested Citation

  • Nan Jia & Lei Li & Hui Guo & Mingyu Xie, 2024. "Important role of Fe oxides in global soil carbon stabilization and stocks," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-54832-8
    DOI: 10.1038/s41467-024-54832-8
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