Long-term partial substitution of chemical fertilizer with green manure regulated organic matter mineralization in paddy soil dominantly by modulating organic carbon quality

文献类型： 外文期刊

第一作者： Xu, Peidong

作者： Xu, Peidong;Zhu, Jun;Fu, Qingling;Geng, Mingjian;Hu, Hongqing;Huang, Qiaoyun;Wu, Ji;Wang, Hui;Han, Shang

作者机构：

关键词： Organic matter; Mineralization; Green manure; Chemical fertilizer substitution; Organic carbon quality; Microbial community

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

年卷期： 2021 年 468 卷 1-2 期

页码：

收录情况： SCI

摘要： Purpose The purpose of this study was to investigate the response characteristics and potential mechanisms of soil organic matter (SOM) mineralization to the ten years partial substitution of chemical fertilizer with green manure in paddy soil. Methods The mineralization of SOM in paddy soil treated with no fertilizer, complete chemical fertilizer, and chemical fertilizer partially substituted with increasing amount of green manure was investigated by incubation experiments. The CO2 released during the incubation was determined by gas chromatography. The chemical structure and pool of soil organic carbon was analyzed by nuclear magnetic resonance and acid hydrolysis, respectively. Soil microbial communities and the abundance of organic carbon hydrolase genes were analyzed by high-throughput sequencing and quantitative polymerase chain reaction, respectively. Random forest analysis was used to analyze the roles of related factors in the mineralization of SOM. Results The mineralization of SOM was significantly suppressed by chemical fertilizer, but the suppression was alleviated or reversed by the partial substitution of chemical fertilizer with increasing amount of green manure. The quality of soil organic carbon showed a similar tendency to the mineralization of SOM. Fertilization treatments, especially those with green manure, significantly increased soil organic carbon quantity and the activity of organic carbon hydrolases. Fertilization treatments also significantly changed the composition of microbial communities, but had no significant influence on the abundance of the genes encoding hydrolases. Conclusion Long-term partial substitution of chemical fertilizer with green manure regulated organic matter mineralization in paddy soil dominantly by modulating organic carbon quality.

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