数字农科院2.0

Regional variability in soil organic carbon responses to chemical fertilizer and manure slurry driven by microbial functional pathways

文献类型： 外文期刊

作者： Chang, Xingping;Wang, Xiaofei;Du, Huiying;Wang, Hao;Zhang, Keqiang;Du, Lianzhu

作者机构：

关键词： Soil organic carbon;Manure slurry application;Regional variation;Carbon cycling genes

期刊名称： ENVIRONMENTAL TECHNOLOGY & INNOVATION

ISSN： 2352-1864

年卷期： 2026 年 41 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Soil organic carbon (SOC) dynamics are profoundly influenced by fertilization regimes and regional environmental conditions. In this study, we compared the impacts of chemical fertilizer and manure slurry application on SOC content and microbial functional gene composition across three geographically distinct regions in China: Harbin, Yiyang, and Nanyang. Our results revealed contrasting SOC responses among regions. Manure slurry application significantly enhanced SOC in Harbin, resulting in a 54 % increase compared with chemical fertilizer, mainly due to a pronounced accumulation of particulate organic carbon (POC). In contrast, SOC responses to manure slurry were minor in Yiyang and Nanyang, indicating that fertilization effects on SOC were strongly site-dependent. Metagenomic analyses showed that manure slurry increased the abundance of carbon fixation genes in Harbin, particularly those involved in the reductive pentose phosphate cycle and reductive tricarboxylic acid cycle, which increased by 9.57 % and 6.38 %, respectively. In contrast, manure slurry in Yiyang primarily enhanced genes involved in labile carbon degradation. Integrating soil properties, microbial functional genes, and enzyme activities revealed that fertilization affected SOC mainly through indirect pathways mediated by soil nutrient conditions and microbial functional traits. Changes in soil nutrients were closely associated with shifts in microbial carbon fixation and degradation gene abundances, which were more strongly linked to SOC and POC than to mineral-associated organic carbon. Overall, our findings indicate that the effectiveness of manure slurry versus chemical fertilizer in promoting SOC sequestration is not universal but strongly context-dependent, emphasizing the need for sitespecific strategies in sustainable soil carbon management.

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