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Dynamic Replacement of Soil Inorganic Carbon under Water Erosion

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  • Chen Zhang

    (Kunming General Survey of Natural Resources Center China Geological Survey, Kunming 650100, China
    Technology Innovation Center for Natural Ecosystem Carbon Sink, Ministry of Natural Resources, Kunming 650100, China)

  • Can Xu

    (Kunming General Survey of Natural Resources Center China Geological Survey, Kunming 650100, China
    Technology Innovation Center for Natural Ecosystem Carbon Sink, Ministry of Natural Resources, Kunming 650100, China)

  • Tianbao Huang

    (Kunming General Survey of Natural Resources Center China Geological Survey, Kunming 650100, China
    Technology Innovation Center for Natural Ecosystem Carbon Sink, Ministry of Natural Resources, Kunming 650100, China)

  • Liankai Zhang

    (Kunming General Survey of Natural Resources Center China Geological Survey, Kunming 650100, China
    Technology Innovation Center for Natural Ecosystem Carbon Sink, Ministry of Natural Resources, Kunming 650100, China)

  • Jinjiang Yang

    (Kunming General Survey of Natural Resources Center China Geological Survey, Kunming 650100, China
    Technology Innovation Center for Natural Ecosystem Carbon Sink, Ministry of Natural Resources, Kunming 650100, China)

  • Guiren Chen

    (Kunming General Survey of Natural Resources Center China Geological Survey, Kunming 650100, China
    Technology Innovation Center for Natural Ecosystem Carbon Sink, Ministry of Natural Resources, Kunming 650100, China)

  • Xiongwei Xu

    (Kunming General Survey of Natural Resources Center China Geological Survey, Kunming 650100, China
    Technology Innovation Center for Natural Ecosystem Carbon Sink, Ministry of Natural Resources, Kunming 650100, China)

  • Fuyan Zou

    (Kunming General Survey of Natural Resources Center China Geological Survey, Kunming 650100, China
    Technology Innovation Center for Natural Ecosystem Carbon Sink, Ministry of Natural Resources, Kunming 650100, China)

  • Zihao Liu

    (Kunming General Survey of Natural Resources Center China Geological Survey, Kunming 650100, China
    Technology Innovation Center for Natural Ecosystem Carbon Sink, Ministry of Natural Resources, Kunming 650100, China)

  • Zhenhui Wang

    (Kunming General Survey of Natural Resources Center China Geological Survey, Kunming 650100, China
    Technology Innovation Center for Natural Ecosystem Carbon Sink, Ministry of Natural Resources, Kunming 650100, China)

Abstract

The dynamic replacement of soil organic carbon represents a pivotal mechanism through which water erosion modulates soil–atmosphere CO 2 fluxes. However, the extent of this dynamic replacement of soil inorganic carbon within this process remains unclear. In our study, we focused on Yuanmou County, China, a prototypical region afflicted by water erosion, as our study area. We leveraged the WaTEM/SEDEM model to quantify the dynamic replacement of soil carbon, accounted for the average annual net change in soil carbon pools, and used isotope tracer techniques to track and measure the process of the coupled carbon–water cycling. This comprehensive approach enabled us to scrutinize the dynamic replacement of soil carbon under water erosion and delineate its ramifications for the carbon cycle. Our findings unveiled that the surface soil carbon reservoir in the Yuanmou area receives an annual replacement of 47,600 ± 12,600 tons following water erosion events. A substantial portion, amounting to 39,700 ± 10,500 tons, stems from the dynamic replacement of soil inorganic carbon facilitated by atmospheric carbon. These results underscore the critical role of the dynamic replacement of soil inorganic carbon in altering the soil–atmosphere CO 2 fluxes under water erosion, thereby influencing the carbon cycle dynamics. Consequently, we advocate for the integration of water erosion processes into regional carbon sink assessments to attain a more comprehensive understanding of regional carbon dynamics.

Suggested Citation

  • Chen Zhang & Can Xu & Tianbao Huang & Liankai Zhang & Jinjiang Yang & Guiren Chen & Xiongwei Xu & Fuyan Zou & Zihao Liu & Zhenhui Wang, 2024. "Dynamic Replacement of Soil Inorganic Carbon under Water Erosion," Land, MDPI, vol. 13(7), pages 1-16, July.
  • Handle: RePEc:gam:jlands:v:13:y:2024:i:7:p:1053-:d:1434847
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    References listed on IDEAS

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    1. Tom J. Battin & Ronny Lauerwald & Emily S. Bernhardt & Enrico Bertuzzo & Lluís Gómez Gener & Robert O. Hall & Erin R. Hotchkiss & Taylor Maavara & Tamlin M. Pavelsky & Lishan Ran & Peter Raymond & Jud, 2023. "River ecosystem metabolism and carbon biogeochemistry in a changing world," Nature, Nature, vol. 613(7944), pages 449-459, January.
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