Soil pH Determines Nitrogen Effects on Methane Emissions From Rice Paddies

文献类型： 外文期刊

第一作者： Tang, Junqi

作者： Tang, Junqi;Qian, Haoyu;Zhu, Xiangcheng;Liu, Zhuoshu;Li, Ganghua;Liu, Zhenghui;Wang, Songhan;Ding, Yanfeng;Jiang, Yu;Tang, Junqi;Qian, Haoyu;Zhu, Xiangcheng;Liu, Zhuoshu;Ding, Yanfeng;Jiang, Yu;Tang, Junqi;Qian, Haoyu;Zhu, Xiangcheng;Liu, Zhuoshu;Li, Ganghua;Liu, Zhenghui;Wang, Songhan;Ding, Yanfeng;Jiang, Yu;Zhu, Xiangcheng;Kuzyakov, Yakov;Kuzyakov, Yakov;Kuzyakov, Yakov;Zou, Jianwen;Wang, Jinyang;Xu, Qiang;Zhang, Weijian;Zhang, Jun;Huang, Shan;Huang, Shan;van Groenigen, Kees Jan

作者机构：

关键词： meta-analysis; methane emissions; methanogens; methanotrophs; rice paddies; soil pH

期刊名称：GLOBAL CHANGE BIOLOGY （ 影响因子：12.0； 五年影响因子：14.0 ）

ISSN： 1354-1013

年卷期： 2024 年 30 卷 11 期

页码：

收录情况： SCI

摘要： Rice paddies account for approximately 9% of human-induced methane (CH4) emissions. Nitrogen (N) fertilization affects CH4 emissions from paddy soils through several mechanisms, leading to conflicting results in field experiments. The primary drivers of these N-related effects remain unclear and the contribution of N fertilization to CH4 emissions from the rice paddies has not yet been quantified for global area. This uncertainty contributes to significant challenges in projecting global CH4 emissions and hinders the development of effective local mitigation strategies. Here, we show through a meta-analysis and experiments that the impact of N fertilization on CH4 emissions from rice paddies can be largely predicted by soil pH. Specifically, N fertilization stimulates CH4 emissions most strongly in acidic soils by accelerating organic matter decomposition and increasing the activities of methanogens. Accounting for the interactions between soil pH and N fertilization, we estimate that N fertilization has raised current area-scaled and yield-scaled CH4 emissions across the total global paddy area by 52% and 8.2%, respectively. Our results emphasize the importance of alleviating soil acidification and sound N management practices to mitigate global warming.

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