数字农科院2.0

Long-term green manure incorporation increases soil carbon sequestration and improves aggregate stability by changing organic carbon components

文献类型： 外文期刊

作者： Chen, Yulu;Huang, Li;Huang, Shaomin;Guo, Tengfei;Zhang, Shuiqing;Guo, Doudou;Song, Xiao;Ding, Shijie;Mehran, Muhammad;Yang, Yongqiang;Yue, Ke;Su, Sumiao;Geng, Mingjian;Zhang, Huimin

作者机构：

关键词： Aggregate stability;DOC;Fluorescence spectra;Green manure;Humification

期刊名称： SOIL & TILLAGE RESEARCH

ISSN： 0167-1987

年卷期： 2025 年 258 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Dissolved organic carbon (DOC), the most labile fraction of soil organic carbon (SOC), plays a vital role in ecosystem functioning and soil productivity. However, the influence of long-term green manure application on DOC composition and its role in soil aggregate formation and carbon stabilization remains unclear. This study investigated changes in DOC composition and their effects on aggregate stability and carbon sequestration in two rice-green manure rotation trials long-5 years in Jingzhou (JZ) and 36 years in Qiyang (QY), China. Treatments included rice-winter fallow (WF), rice-Chinese milk vetch (MV), rice-oilseed rape (RP), and rice-ryegrass (RG). At the JZ test site, 5-year MV incorporation slightly improved aggregate stability, measured by mean weight diameter (MWD) and geometric mean diameter (GMD), but without significant changes. In contrast, at QY, 36year MV and RG incorporation significantly enhanced both MWD and GMD. Green manure addition increased SOC and DOC contents and enhanced the molecular complexity of DOC, reflected by higher molecular weight, aromaticity, and humification degree. DOC was primarily derived from plant residues and microbial metabolites, with green manure application enhancing microbial contributions. Fluorescence spectroscopy identified three DOC components: bioavailable, humic-like, and protein-like. While DOC composition at JZ remained largely unchanged after 5 years of MV incorporation, 36 years of MV and RG incorporation at QY facilitated the transformation of protein-like into humic-like components. SOC, humic-like DOC, and the humification index (HIX), were the key drivers of aggregate stability, showing direct positive effects on aggregate MWD. Humic-like DOC indirectly promoted SOC accumulation through increased DOC aromaticity and enhanced humification. Our findings highlight the central role of humic-like DOC in enhancing SOC sequestration and soil aggregate stabilization, underscoring the long-term benefits of green manure in sustainable agriculture.

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