数字农科院2.0

Legacy effects cause systematic underestimation of N2O emission factors

文献类型： 外文期刊

作者： Haoyu Qian;Zhengqi Yuan;Nana Chen;Xiangcheng Zhu;Shan Huang;Changying Lu;Kailou Liu;Feng Zhou;Pete Smith;Hanqin Tian;Qiang Xu;Jianwen Zou;Shuwei Liu;Zhenwei Song;Weijian Zhang;Songhan Wang;Zhenghui Liu;Ganghua Li;Ziyin Shang;Yanfeng Ding;Kees Jan van Groenigen;Yu Jiang

作者机构：

期刊名称： Nature Communications

ISSN： 2041-1723

年卷期： 2025 年 16 卷 1 期

页码：

收录情况： SCIE（2025版）

摘要： Agricultural soils contribute ~52% of global anthropogenic nitrous oxide (N2O) emissions, predominantly from nitrogen (N) fertilizer use. Global N2O emission factors (EFs), estimated using IPCC Tier 1 methodologies, largely rely on short-term field measurements that ignore legacy effects of historic N fertilization. Here we show, through data synthesis and experiments, that EFs increase over time. Historic N addition increases soil N availability, lowers soil pH, and stimulates the abundance of N2O producing microorganisms and N2O emissions in control plots, causing underestimates of EFs in short-term experiments. Accounting for this legacy effect, we estimate that global EFs and annual fertilizer-induced N2O emissions of cropland are 1.9% and 2.1 Tg N2O-N yr−1, respectively, both ~110% higher than IPCC estimates. Our findings highlight the significance of legacy effects on N2O emissions, emphasize the importance of long-term experiments for accurate N2O emission estimates, and underscore the need for mitigation practices to reduce N2O emissions.

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