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Improvement and Stability of Soil Organic Carbon: The Effect of Earthworm Mucus Organo-Mineral Associations with Montmorillonite and Hematite

Author

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  • Yuxuan Li

    (Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China)

  • Siyue Feng

    (Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China)

  • Lin Wang

    (Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China)

  • Chencen Lei

    (Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China)

  • Hongbo Peng

    (Faculty of Modern Agricultural Engineering, Kunming University of Science & Technology, Kunming 650500, China)

  • Xinhua He

    (School of Biological Sciences, University of Western Australia, Perth, WA 6009, Australia)

  • Dandan Zhou

    (Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China)

  • Fangfang Li

    (Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China)

Abstract

Improving soil carbon storage and stability plays an important role in the development of sustainable agricultural production and mitigating climate change. Earthworms are widely distributed in soil environments; earthworm mucus (EM) can interact with natural mineral materials to form EM–mineral association, enriching soil carbon storage. However, it is unclear how minerals affect the formation and oxidation degradation of EM–mineral associations. Herein, the interactions between EM and natural mineral materials (hematite ore (HO) and montmorillonite (MT)) were investigated. The carbon stability of EM–mineral associations was analyzed based on their chemical oxidative resistance. EM interacted with HO/MT through ligand exchange, hydrogen bonding interaction, and electrostatic attraction. Compared to EM that was extracted under pH 5.0 (EM5) or 9.0 (EM9), EM obtained at pH7 (EM7) contained more protein and polysaccharide components, and was greatly adsorbed by HO/MT. Moreover, EM showed a stronger sorption affinity to MT than HO. The stronger oxidation resistance of EM–MT than EM–HO was revealed by its higher carbon retention, suggesting the vital role of MT in protecting biogenically excreted organic carbon from degradation. Earthworms in neutral environments could substantially promote the establishment of organo-mineral associations. This study provides guidance for promoting soil carbon sequestration through agricultural management and is beneficial to the sustainability of the soil.

Suggested Citation

  • Yuxuan Li & Siyue Feng & Lin Wang & Chencen Lei & Hongbo Peng & Xinhua He & Dandan Zhou & Fangfang Li, 2024. "Improvement and Stability of Soil Organic Carbon: The Effect of Earthworm Mucus Organo-Mineral Associations with Montmorillonite and Hematite," Sustainability, MDPI, vol. 16(13), pages 1-13, June.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:13:p:5458-:d:1423371
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    References listed on IDEAS

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    1. Michael W. I. Schmidt & Margaret S. Torn & Samuel Abiven & Thorsten Dittmar & Georg Guggenberger & Ivan A. Janssens & Markus Kleber & Ingrid Kögel-Knabner & Johannes Lehmann & David A. C. Manning & Pa, 2011. "Persistence of soil organic matter as an ecosystem property," Nature, Nature, vol. 478(7367), pages 49-56, October.
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