Consecutive application of peanut shell and its biochar triggered different soil organic carbon mineralization by altering microbial resource availability and composition in sweet potato cropping systems

文献类型： 外文期刊

第一作者： Na, Meng

作者： Na, Meng;Feng, Jinping;Xu, Shangqi;Zhou, Jihai;Na, Meng;Feng, Jinping;Xu, Shangqi;Zhou, Jihai;Li, Xiaoping;Zhou, Jihai;Zheng, Xianqing

作者机构：

关键词： Peanut shell and biochar incorporation; Soil organic carbon mineralization; Microorganisms; Microbial resources; Red soil

期刊名称：PLANT AND SOIL （ 影响因子：4.1； 五年影响因子：4.7 ）

ISSN： 0032-079X

年卷期： 2025 年

页码：

收录情况： SCI

摘要： Background and aims The incorporation of crop residues into cultivated soils is widely adopted to improve soil quality of degraded lands. However, the understanding of how soil organic carbon (SOC) mineralization responds to consecutive residue return and the underlying microbial mechanisms remains limited. Methods Peanut shell or its derived biochar was annually applied at low and high rates to degraded upland red soils under a sweet potato system over two years, to assess changes in SOC mineralization, soil biochemical characteristics, microbial activities, and crop yield. Results The second-year application of high biochar generated a more pronounced increase in SOC mineralization compared to peanut shell application. This result was associated with lower soil nitrogen (N) availability in biochar-amended soils, which increased microbial demand for N from soils. In addition, the first-year addition of biochar improved stable microbial biomass C in soils, leading to microbes living in a resource-limited environment. The second-year addition of biochar could then activate the starving community to mine SOC by providing sufficient resources. In contrast, the first-year addition of peanut shell increased labile dissolved organic C in soils, leading to less resource restriction. The second-year addition of peanut shell thus had small stimulation on labile SOC mineralization. Moreover, biochar applications improved bacterial abundance which drove strong SOC mineralization. Peanut shell applications increased fungal abundance which dominated SOC mineralization. Conclusion The annual high amounts of biochar application may lead to greater soil C release than raw crop residues within two years, providing new insights for optimizing agricultural management.

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