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Soil Inorganic Carbon Losses Counteracted Soil Organic Carbon Increases in Deeper Soil over 30 Years in North China

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  • Yuanyuan Tang

    (College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China)

  • Xiangyun Yang

    (College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China)

  • Xinru Wang

    (College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China)

  • Guohong Du

    (College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China)

  • Mukesh Kumar Soothar

    (College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China)

  • Qi Tian

    (College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China)

  • Yanbing Qi

    (College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China)

Abstract

Finding out the dynamics of soil organic carbon and inorganic carbon is paramount for sustaining terrestrial carbon cycling and climate change mitigation. From the 1980s to 2010s, substantial changes in land use, climate, and agricultural practices have occurred across North China. This study systematically quantified the stratified dynamics of soil carbon stocks (0–100 cm with 20 cm intervals) and their compositional shifts by using the geographically weighted regression kriging model. The model integrated soil sample data from provincial surveys across North China with key environmental covariates (e.g., elevation, precipitation, air temperature, and the vegetation index) to spatially predict and analyze vertical carbon stock changes. The results indicated that soil carbon stocks decreased considerably by 5.86 Gt in the one-meter soil profile from the 1980s to the 2010s. Significant losses in soil inorganic carbon stocks directly contributed to net soil carbon sources. These significant soil inorganic carbon losses of 7.03 Gt, originating primarily from losses of 7.35 Gt in deeper soil layers (20–100 cm), effectively offset increases of 1.17 Gt in soil organic carbon. About two-thirds of regions in North China have been categorized as carbon source regions. These are distributed for the most part in arid and semi-arid areas and the Qinghai–Tibet Plateau. The remaining one-third of regions have been classified as carbon sink regions which are primarily found in the Loess Plateau, the Huang–Huai–Hai Plain, the Middle-lower Yangtze Plain, and the Northeast China Plain. Significant losses in soil inorganic carbon stocks caused by strong carbon sources may undermine global measures aimed at enhancing terrestrial ecosystem carbon sequestration and fixation. Our results highlight the urgent need to account for vulnerable subsurface inorganic carbon pools in regional carbon sequestration strategies and climate models.

Suggested Citation

  • Yuanyuan Tang & Xiangyun Yang & Xinru Wang & Guohong Du & Mukesh Kumar Soothar & Qi Tian & Yanbing Qi, 2025. "Soil Inorganic Carbon Losses Counteracted Soil Organic Carbon Increases in Deeper Soil over 30 Years in North China," Land, MDPI, vol. 14(8), pages 1-24, August.
    • Handle: RePEc:gam:jlands:v:14:y:2025:i:8:p:1616-:d:1720913
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    References listed on IDEAS

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    1. Anandkumar Naorem & Somasundaram Jayaraman & Ram C. Dalal & Ashok Patra & Cherukumalli Srinivasa Rao & Rattan Lal, 2022. "Soil Inorganic Carbon as a Potential Sink in Carbon Storage in Dryland Soils—A Review," Agriculture, MDPI, vol. 12(8), pages 1-20, August.
    2. Jörg Henseler & Marko Sarstedt, 2013. "Goodness-of-fit indices for partial least squares path modeling," Computational Statistics, Springer, vol. 28(2), pages 565-580, April.
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