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The Mechanism of γ-MnO2-mediated Abiotic Nitrogen Mineralization in Peptone and Its Influencing Factors
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Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences/Key Laboratory of Fertilization from Agricultural Wastes, Ministry of Agriculture and Rural Affairs/Hubei Engineering Research Center for Agricultural Environmental Control

Fund Project:

Supported by the National Key R&D Program of China (No. 2021YFD1901205), the General Projects by the China Postdoctoral Science Foundation (No. 2022M721078), and the Youth Science Fund Project of Hubei Academy of Agricultural Sciences, China (No. 2025NKYJJ16)

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    Abstract:

    【Objective】Existing literature has predominantly concentrated on the influence of microbial activity on soil organic nitrogen mineralization. However, the role of abiotic processes, particularly the non-biological mineralization of organic nitrogen facilitated by typical manganese oxides, has received little attention. 【Method】This study employed nsutite (γ-MnO2) as the experimental mineral and soybean-derived peptone as a representative of soil organic nitrogen to investigate the effect of abiotic nitrogen mineralization mediated by γ-MnO? under a near-neutral environment and elucidated the reaction mechanism. Three experimental systems were designed: a peptone system (0.25 g?L–1), a γ-MnO2 system (1.0 g?L–1), and a mixed system comprising both peptone (0.25 g?L–1) and γ-MnO2 (0.25~2.0 g?L–1). 【Result】The results indicated that under pH 7.0 and in an air atmosphere, γ-MnO2 could facilitate the mineralization of peptone nitrogen, producing inorganic nitrogen. The mineralization rate of peptone (0.25 g?L–1) initially increased and then tended to stabilize with increasing initial γ-MnO? concentrations (0.0-2.0 g?L–1). In this process, Mn(IV) and Mn(III) present in γ-MnO?, along with reactive oxygen species (ROS) generated on the mineral surface, served as the principal oxidizing agents facilitating the mineralization of peptone into inorganic nitrogen. 【Conclusion】This study is anticipated to advance the understanding of organic nitrogen mineralization mechanisms in farmland soils and to enhance the comprehension of nitrogen cycling processes within agricultural ecosystems.

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History
  • Received:December 05,2024
  • Revised:February 28,2025
  • Adopted:March 21,2025
  • Online: March 21,2025
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