Soil aggregate carbon stocks and sequestration efficiency under long-term fertilization across China's croplands

文献类型： 外文期刊

第一作者： Cheng, Man

作者： Cheng, Man;Ma, Haiyang;Li, Puwang;Cheng, Man;Shi, Ting;Xu, Minggang;Cheng, Man;Chen, Zhixuan;Wen, Yongli

作者机构：

关键词： Soil aggregation; Carbon distribution; Carbon sequestration efficiency; Long-term fertilization; China' croplands

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： 2026 年 255 卷

页码：

收录情况： SCI

摘要： Sequestration of soil organic carbon (SOC) within aggregates is widely recognized as a critical mechanism for SOC conservation. However, understanding of how long-term fertilization influences soil aggregation and carbon distribution remains limited. To investigate these responses across different fertilizer types, a meta-analysis was performed by synthesizing data from 53 studies, encompassing 229 paired observations across croplands in China. The results showed that, on average, long-term fertilization significantly increased carbon stocks in large macroaggregates (LM; >2000 mu m), small macroaggregates (SM; 250-2000 mu m), microaggregates (MIC; 53-250 mu m) and silt-clay fractions (SC; <53 mu m) by 43.3 %, 32.4 %, 11.6 % and 6.2 %, respectively, compared to no fertilization. Under different fertilization regimes, balanced chemical fertilization (BCF), chemical-manure fertilization (CMF) and manure fertilization (MF) enhanced carbon stocks in LM, SM and MIC, whereas partial chemical fertilization (PCF) exerted no significant effect. Long-term fertilization practices affect aggregate-associated carbon stocks via distinct pathways. The highest average carbon sequestration efficiency (CSE) was observed in SM (8.8 %), followed by LM and MIC (3.5 % and 1.3 %, respectively), with the lowest average CSE in SC. Mean annual temperature (MAT) was identified as the critical factor regulating CSE: for every 1 degrees C increase in MAT, the CSE of bulk soil and SM decreased by 0.8 %, whereas the CSE of SC increased by 0.3 %. These findings establish a quantitative framework linking fertilization strategies to size-dependent carbon sequestration patterns, offering critical insights for optimizing agricultural management to enhance soil carbon stocks across China's diverse agroecosystems.

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