Quantifying the global methane mitigation potential of deep nitrogen placement in rice paddies

作者：Xiangcheng Zhu, Nana Chen, Weiwei Li, Junqi Tang, Yuanfa Huang, Haoyu Qian, Ganghua Li, Yanfeng Ding, Kees Jan van Groenigen, Yu Jiang · 发表于：Resources Conservation and Recycling · 年份：2025 · DOI：10.1016/j.resconrec.2025.108315 · 被引用次数：12 · 研究领域：Soil Carbon and Nitrogen Dynamics、Rice Cultivation and Yield Improvement

Rice paddies are major sources of methane (CH₄), a potent greenhouse gas, with emissions influenced by soil nitrogen (N) availability. Deep nitrogen placement (DN) is emerging as a promising strategy to improve rice yields, N use efficiency, while also impacting CH₄ emissions. However, the variability in DN's effects on CH₄ emissions complicates the extrapolation of experimental results to broader geographical regions. This study, combining meta-analysis and experiments, identifies N application rate as a key factor in DN's impact on CH₄ emissions. DN is more effective at CH₄ emission mitigation with higher N application rates, mainly through reducing organic matter decomposition and suppressing soil mcrA gene abundance. We estimate that DN could lower CH₄ emissions from global rice paddies by 14.6 %. These findings underscore the potential of DN to mitigate CH₄ emissions on a global scale while enhancing rice yields and N efficiency, particularly in regions with high N application rates.