数字农科院2.0

Optimizing maize straw return enhances wheat yield and nitrogen use efficiency while reducing N2O emissions

文献类型： 外文期刊

作者： Wu, Liuge;Wang, Qiang;Su, Yuxiao;Zheng, Yuntan;Lu, Yulun;Zheng, Shanchao;Akhtar, Muhammad;Deng, Aixing;Zhang, Xin;Song, Zhenwei;Zheng, Chengyan;Zhang, Weijian

作者机构：

关键词： Straw return methods;Wheat;Yield;NUE;N2O emissions

期刊名称： SOIL & TILLAGE RESEARCH

ISSN： 0167-1987

年卷期： 2025 年 256 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Crop straw return can not only affect soil fertility & crop productivity, but also influence nitrogen use efficiency (NUE) and nitrous oxide (N2O) emissions. However, the optimal straw return methods that ensure high yield and NUE (grain yield/total N uptake, %) with less N2O emissions remain inadequately understood. Here, we conducted a two-year field experiment in the North China Plain to investigate the integrated effects of maize straw return on wheat yield, NUE and N2O emissions with five treatments: straw removal (CK), straw mulch (SM), straw mixed evenly into the 0-10 cm soil layer (SR10), straw mixed evenly into the 0-20 cm soil layer (SR20), and straw mixed evenly with the 0-10 cm soil and then the mixture incorporated into the 10-20 cm soil layer (TB). Results showed that maize straw return significantly increased wheat yield compared to straw mulch, with the method of TB achieving the highest yield (10.63 Mg ha(-1)) and NUE (32.97). TB also improved soil organic carbon (SOC) and total N (TN) at the 10-20 cm soil layer, with TN increased by 24.89 % on average compared with SM, promoting soil N uptake by wheat plant and reducing N2O emissions. Conversely, straw mulch or mixed into 0-10 cm soil layer triggered cumulative N2O emissions by 22.33 % and 20.39 % compared to TB, respectively, particularly during the early growing stages, due to enhanced nitrification microbial activity and reduced substrate supply for denitrification. TB reduced yield-scaled N2O emissions by 27.6-29.4 % compared with straw mulch. Structural equation modeling (SEM) revealed that effects of straw return on soil chemical properties (r = 0.37, P < 0.001) and denitrification microbial activity (r = 0.62, P < 0.001) were key drivers of N2O emissions. These findings highlight that stratified incorporation of straw-soil mixtures is a promising strategy to balance wheat yield, NUE, and N2O mitigation in intensive wheat-maize cropping systems in the North China Plain.

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