数字农科院2.0

Straw return boosts N2O emissions primarily during the pre-jointing stage in winter wheat fields: A meta-analysis

文献类型： 外文期刊

作者： Wu, Liuge;Wang, Qiang;Shang, Ziyin;Chen, Haotian;Deng, Aixing;Song, Zhenwei;Zheng, Chengyan;Zhang, Weijian

作者机构：

关键词： Straw return;N2O emissions;Stage-sensitive mitigation;Winter wheat agroecosystem

期刊名称： AGRICULTURE ECOSYSTEMS & ENVIRONMENT

ISSN： 0167-8809

年卷期： 2025 年 399 卷

页码：

收录情况： SCIE（2025版）

摘要： Straw return is generally associated with increased nitrous oxide (N2O) emissions in winter wheat systems. However, the stage-specific dynamics of N2O emissions remain unclear and hinder the implementation of precise mitigation practices. This knowledge gap will affect the efficient application of nitrogen (N) fertilizer with less N2O emissions. Here, we conducted a comprehensive meta-analysis based on 816 comparisons to quantify the overall and growth stage-specific effects of straw return on N2O emissions and to identify key environmental and agronomic drivers. On average, straw return increased seasonal N2O emissions by 15.32 %, with a significantly greater effect size observed during the pre-jointing stage (17.80 %) compared to the post-jointing stage (14.71 %). Moreover, the pre-jointing stage accounted for 63.66 % of the total seasonal N2O emissions. Fine-textured soils and lower N application rates amplified effect sizes at the pre-jointing stage, whereas post-jointing responses were more affected by topdressing and soil texture interactions. Notably, N2O emission responses increased with N fertilizer amount under straw mulch, but decreased under plow tillage. This study provides the first quantitative synthesis distinguishing the effects of straw return across growth stages and highlights how management interactions impact N2O emissions. The findings offer practical guidance for stage-specific mitigation by avoiding simultaneous straw mulch and high N input at pre-jointing stage, and by adjusting topdressing strategies according to soil texture to reduce N2O emissions in winter wheat systems.

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