数字农科院2.0

Linking microbial life strategies to carbon mineralization under diverse tillage practices: Insights from eroding black soil hillslopes

文献类型： 外文期刊

作者： Qian, Rui;Gao, Lei;Liu, Junjie;Biswas, Asim;Peng, Xinhua

作者机构：

关键词： Soil erosion;Tillage practices;Carbon mineralization;Microbial life-strategy

期刊名称： AGRICULTURE ECOSYSTEMS & ENVIRONMENT

ISSN： 0167-8809

年卷期： 2025 年 399 卷

页码：

收录情况： SCIE（2025版）

摘要： Microbial community structure plays a critical role in regulating soil organic carbon (SOC) mineralization in agricultural systems. However, the interrelationships between microbial life-history strategies and SOC mineralization under different tillage practices in erosion-prone landscapes remain insufficiently understood. This study explored the microbial mechanisms underlying SOC mineralization across three tillage systems, conventional tillage with straw removal (CT), conventional tillage with straw incorporation (CTS), and no-tillage with straw mulch (NTS), on a hillslope in Northeast China's black soil region. Cumulative SOC mineralization (1132.8-3044.5 kg C ha(-1)) varied significantly with slope positions and tillage practice (p < 0.05), with upper and lower positions exhibiting 50.2 % and 34.5 % higher values than the middle position, respectively. Compared to CT, CTS increased SOC mineralization by 68.5 %. Although NTS also exhibited higher mineralization than CT, it promoted SOC storage as confirmed by positive C balance. Microbial life-history strategies emerged as stronger predictors of SOC mineralization than microbial diversity alone. Bacterial communities displayed distinct shifts in response to erosion and deposition, transitioning from r-strategists in nutrient-rich upper and lower positions to K-strategists in the nutrient-depleted middle area. In contrast, fungal communities responded primarily to tillage practice, with the abundant input of fresh straw favoring r-strategist fungi (e. g., Ascomycota) as key drivers of SOC mineralization and accumulation, rather than K-strategists. Our findings provide mechanistic insights into microbe-mediated C cycling in agricultural systems and support the implementation of conservation tillage practices to enhance SOC sequestration in erosion-vulnerable landscapes.

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