数字农科院2.0

Green Manure Intercropping with Reduced Chemical N Input Mitigates Yield-Scaled N2O Emissions in Arid Maize Systems

文献类型： 外文期刊

作者： Li, Hanting;Chen, Guiping;Fan, Zhilong;Nan, Yunyou;Hu, Falong;Yin, Wen;Cao, Weidong;Zhang, Min;Chai, Qiang;Yao, Tuo

作者机构：

关键词： green manure intercropping;reduced N input;N2O emissions;soil mineral N;arid areas

期刊名称： AGRONOMY-BASEL

ISSN：

年卷期： 2026 年 16 卷 2 期

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收录情况： SCIE（2025版）

摘要： Agricultural soils are the largest anthropogenic source of nitrous oxide (N2O), primarily due to excessive nitrogen (N) fertilization and inefficient N management. Mitigating N2O emissions from croplands without compromising productivity is therefore a major global challenge for climate and environmental sustainability. A three-year split-plot field experiment was conducted in an arid maize production region of northwestern China to examine how green manure intercropping combined with reduced chemical N input regulates N2O emissions and soil N residues. The main plots comprised maize monoculture (M), maize intercropped with common vetch (M/V), and maize intercropped with rape (M/R), while subplots consisted of local conventional N application (N1: 360 kg N ha(-1)) and a 25% reduced rate (N2: 270 kg N ha(-1)). Results indicated that intercropping with green manure can offset the reduction in maize grain yield caused by a 25% decrease in N supply. Green manure intercropping significantly decreased cumulative N2O emissions compared with monoculture maize, and the mitigation effect was further strengthened under reduced N input. The M/V system under reduced N input exhibited the strongest mitigation effect, reducing N2O emissions per unit of grain yield by 9.2-11.5% compared with the M/R system. This reduction was driven by the ability of M/V to stabilize soil mineral N availability. Notably, the independent maize growth stage contributed 52.6-66.9% of total seasonal N2O emissions, emphasizing it as a critical period for emission mitigation. Overall, integrating green manure intercropping with reduced chemical N input effectively mitigates N2O emissions while maintaining maize productivity in arid regions, providing a practical strategy for sustainable and environmentally responsible agricultural intensification.

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