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γ-MnO2介导蛋白胨非生物氮矿化作用机制及其影响因素
作者:
作者单位:

湖北省农业科学院植保土肥研究所/农业农村部废弃物肥料化利用重点实验室/农业环境治理湖北省工程研究中心

基金项目:

国家重点研发计划项目(2021YFD1901205)、中国博士后科学基金面上项目(2022M721078)和湖北省农业科学院青年科学基金项目(2025NKYJJ16)资助


The Mechanism of γ-MnO2-mediated Abiotic Nitrogen Mineralization in Peptone and Its Influencing Factors
Author:
  • HONG Jun

    HONG Jun

    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
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  • XIA Xiange

    XIA Xiange

    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
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  • CHEN Yunfeng

    CHEN Yunfeng

    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
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  • LIU Bo

    LIU Bo

    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
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  • DUAN Xiaoli

    DUAN Xiaoli

    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
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  • ZHANG Minmin

    ZHANG Minmin

    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
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  • NIE Xinxing

    NIE Xinxing

    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
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  • YANG Li

    YANG Li

    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
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Affiliation:

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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    摘要:

    现有研究多关注微生物活动对土壤有机氮矿化的影响，忽视了非生物作用对其贡献，尤其是典型锰氧化物介导下有机氮的非生物矿化过程。以六方锰矿（γ-MnO2）为供试矿物，大豆源蛋白胨为土壤有机氮代表，设计了3个实验体系，即蛋白胨（0.25 g?L–1）单一体系、γ-MnO2（1.0 g?L–1）单一体系以及蛋白胨（0.25 g?L–1）与γ-MnO2（0.25~2.0 g?L–1）混合体系，研究了近中性环境条件下γ-MnO2介导蛋白胨非生物氮矿化过程和反应机制。结果表明，在pH 7.0、空气氛围下，γ-MnO2可促使蛋白胨氮矿化，生成无机态氮。蛋白胨（0.25 g?L–1）矿化速率随着初始γ-MnO2浓度（0.0~2.0 g?L–1）的提高先增大后趋于平衡；Mn(IV)、Mn(III)以及矿物表面产生的活性氧物种（ROS）是蛋白胨矿化生成无机态氮的主要氧化剂。本研究有望深化农田土壤有机氮矿化机理，丰富对农田生态系统中氮循环的认知。

    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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洪俊,夏贤格,陈云峰,刘波,段小丽,张敏敏,聂新星,杨利.γ-MnO2介导蛋白胨非生物氮矿化作用机制及其影响因素[J].土壤学报,DOI:10.11766/trxb202412050475,[待发表]
HONG Jun, XIA Xiange, CHEN Yunfeng, LIU Bo, DUAN Xiaoli, ZHANG Minmin, NIE Xinxing, YANG Li. The Mechanism of γ-MnO2-mediated Abiotic Nitrogen Mineralization in Peptone and Its Influencing Factors[J]. Acta Pedologica Sinica, DOI:10.11766/trxb202412050475,[In Press]

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  • 收稿日期:2024-12-05
  • 最后修改日期:2025-02-28
  • 录用日期:2025-03-21
  • 在线发布日期: 2025-03-21
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