Global synthesis on the responses of microbial- and plant-derived carbon to conservation tillage

文献类型： 外文期刊

第一作者： Yu, Yalin

作者： Yu, Yalin;Li, Li;Yang, Jinkang;Zhou, Jie;Li, Feng-Min;Yang, Haishui;Kan, Zheng-Rong;Xu, Yinan;Virk, Ahmad Latif

作者机构：

关键词： Conservation tillage; Soil organic carbon; Microbial-derived C; Plant-derived C; Meta-analysis

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： Aims The formation of soil organic carbon (SOC) is a complex phenomenon mainly originating from plant- and microbial-derived C. Conservation tillage involving no-till and residue return (RR) has been widely practiced to enhance SOC, but the relative contributions of plant- and microbial-derived C to SOC under these practices are still unknown. Methods A global meta-analysis of 500-paired observations was used to identify the effects of no-till and RR on plant- and microbial-derived C and their drivers. Results The results showed that no-till increased microbial necromass C by 18.3%, and the contribution of microbial necromass C to SOC by 5.0%, whereas plant necromass C and its contribution to SOC remained unchanged under no-till. No-till increased the ratio of fungal to bacterial necromass C by 12.3%, indicating fungal necromass C contributes more to SOC. The microbial necromass C under no-till was increased the most at MAP < 550 mm, humidity index < 85, medium-textured soil, acid soil, and initial C/N ratio >= 10 (P < 0.05). Dissolved organic and microbial biomass carbon contributed to the formation of microbial necromass C and benefited the SOC accumulation. RR increased plant and microbial necromass C by 83.8% and 13.0%, respectively, and enhanced the contribution of plant necromass C to SOC by 64.1%. Greater plant-derived C was observed when the experiment duration was over 3 years. Conclusions Our global meta-analysis highlighted that no-till can improve soil carbon stability (microbial-derived C) while RR can increase soil carbon quantity (plant-derived C). Conservation tillage (no-till and RR) is sustainable strategies through collaborative improvement of SOC capacity and quality.

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