Cover cropping shifts microbial life-history strategies to promote necromass carbon accumulation through soil metabolite mediation in orchard systems

文献类型： 外文期刊

第一作者： Zhang, Yutao

作者： Zhang, Yutao;Xiang, Xingjia;Liu, Jia;Liu, Kailou;Li, Daming;Cui, Rong;Liu, Yaxin;Liu, Ming

作者机构：

关键词： Cover crop amendment; Microbial life-history strategy; Microbial necromass carbon; Bacterial community assembly; Soil metabolites

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：6.8； 五年影响因子：7.8 ）

ISSN： 0167-1987

年卷期： 2025 年 254 卷

页码：

收录情况： SCI

摘要： Preliminary studies suggest that cover cropping (CC) enhances necromass carbon (C) accumulation, but the specific mechanisms linking microbial life-history strategies and soil biochemical pathways remain unclear. This study investigated these processes in orchard systems under hairy vetch (Vicia villosa Roth) cover in southern China, focusing on quantifying necromass C using biomarker analysis and examining the contributions of microbial assembly, life-history strategies, and soil metabolites to necromass C. Compared to clean tillage (CT), CC increased necromass C by 33.90 % and soil organic carbon (SOC) by 27.36 %. CC also enhanced homogeneous selection (HS), boosting bacterial community assembly by 12.85 % compared to CT, reinforcing deterministic processes. Additionally, CC shifted microbial life-history strategies toward the Y-strategy, enriching certain Proteobacteria with strong growth potential, leading to a 40.87 % increase in their relative abundance. Metabolites from the lipid and nucleic acid metabolic pathways, including lipids and lipid-like molecules (LL) as well as nucleosides, nucleotides, and analogues (NN), were significantly enhanced under CC, with relative abundances increasing by 94.85 % and 27.73 %, respectively, and positively correlating with necromass C. Partial least squares path modeling indicated that CC altered the bacterial community composition, ultimately increasing necromass C content, with this effect primarily mediated by soil metabolites. Overall, these findings demonstrate that CC promotes Y-strategist dominance through HS, which regulates LL and NN metabolism to promote necromass C accumulation. This study reveals novel perspectives on the microbial-mediated biochemical processes governing necromass C dynamics in orchard ecosystems, offering practical implications for sustainable agricultural management.

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