数字农科院2.0

Stabilization of plant-derived carbon from different green manure species mediated by carbon-decomposition genes

文献类型： 外文期刊

作者： 李庭宇;冯伟;王天舒;孟熠黎;尧水红;彭新华

作者机构：

关键词： green manure;SOC storage;C recalcitrance;C functional genes

期刊名称： Journal of Integrative Agriculture

ISSN： 2095-3119

年卷期： 2025 年

页码：

收录情况： SCIE（2025版） ; ; CSCD（2025-2026年度） ; ; 科技核心（2024版） ; ; 农林核心（2024版）

摘要： The integration of green manure (GM) crops into traditional cropping systems has regained attention for its potential to improve soil organic carbon (SOC) content in an environmentally sustainable way. However, the effects of carbon (C) input from different GM species on the SOC accumulation and recalcitrant C fractions across soil profile remain inadequately understood. This three-year North China Plain study assessed SOC changes and C fractions of easily oxidizable organic carbon (EOC) and recalcitrant organic carbon (ROC) in fallow, rye, rapeseed, and vetch systems, with δ13C analysis for GM-derived C fraction and microbial C-decomposition functional genes. Our results show that SOC was significantly increased by GMs. Rapeseed was the only species that improved SOC at 20-40 cm, the rapeseed-derived C contributed 2.48% of the SOC. Rye enhanced EOC and ROC at topsoil, rapeseed increased ROC at 20-60 cm, and vetch increased EOC at 40-60 cm. At the topsoil, the abundances of cellulose- and pectin-decomposition gene were increased in vetch and decreased in rye. At 20-40 cm, the pectin- and lignin-decomposition genes were markedly improved by rapeseed, while at 40-60 cm, the chitin-decomposition gene was increased in vetch, indicating the microbial promoting effects by deep roots of vetch and rapeseed. Our results suggest GM species influence SOC deposition depth and the recalcitrance of SOC decomposition, thereby affecting the distribution of SOC accumulation through microbial-driven C decomposition activities.

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