数字农科院2.0

The differences in effects of short-term and long-term N fertilization on CH4 emissions from rice paddies

文献类型： 外文期刊

作者： Nana Chen;Xiangcheng Zhu;Kailou Liu;Jin Chen;Shan Huang;Yanfeng Ding;Haoyu Qian;Xin Zhang; Yu Jiang

关键词： Rice paddies; CH4 emissions; Nitrogen fertilization; Methanogens; Methanotrophs; Legacy effects

期刊名称： AGRICULTURE ECOSYSTEMS and ENVIRONMENT

ISSN： 0167-8809

年卷期： 2025 年

页码：

收录情况： SCIE（2023版）

摘要： Rice paddies are one of the main anthropogenic sources of methane (CH4), and their emissions are strongly influenced by nitrogen (N) fertilization. However, the temporal variation in the effects of N fertilization on CH4 emissions remains poorly understood. Leveraging a unique 43-year field experiment, this study provides the first direct investigation of the different effects of short- versus long-term N fertilization on CH4 emissions. We found that N fertilization stimulated CH4 emissions more strongly in long-term than in short-term plots. Short-term fertilization increased CH4 emissions by 49–60 %, whereas long-term N fertilization increased emissions by 324–339 %. Compared with short-term N fertilization, long-term N fertilization resulted in higher soil dissolved organic carbon (DOC) and NH4+-N concentrations and increased ethanogenic abundance by 56 %. Moreover, it shifted methanogenic and methanotrophic communities toward more efficient CH4 production (an increase in the relative abundance of Methanoregula) and less efficient CH4 oxidation (a decrease in the relative abundance of Methylocystis). These findings indicated that long-term N fertilization exacerbated CH4 emissions compared to short-term primarily due to legacy effects on substrate availability and microbial community structure. Our findings suggest that current estimates of the impact of N fertilization on CH4 emissions may be underestimated, underscoring the urgent need for targeted mitigation strategies in intensively managed rice systems to effectively reduce CH4 emissions.

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