Applying green manure and zeolite and reducing N fertilization in maize mitigates N2O emission while maintaining yield

文献类型： 外文期刊

第一作者： Liu, Rui

作者： Liu, Rui;Chai, Qiang;Chang, Danna;Cao, Weidong;Liang, Hao;Zhang, Jiudong;Liu, Rui;Li, Ran

作者机构：

关键词： Green manure; Zeolite; Nitrous oxide; Soil labile fraction; Enzyme activity; Functional gene abundance

期刊名称：AGRONOMY FOR SUSTAINABLE DEVELOPMENT （ 影响因子：6.7； 五年影响因子：8.5 ）

ISSN： 1774-0746

年卷期： 2025 年 45 卷 4 期

页码：

收录情况： SCI

摘要： Green manure is widely employed to substitute chemical N fertilizer. However, the potential of further alleviating N2O emission when combined with efficient management technologies has not been fully explored. To reduce this research gap, a 2-year field experiment was conducted in northwestern China. The aim was to investigate the impact of zeolite application on N2O emission in the maize-common vetch intercropping system under 30% N reduction, as well as the possible mechanisms. The experiment included two cropping systems, namely monoculture maize and maize-common vetch intercropping, along with three amendment practices, namely conventional N, 70% conventional N, and zeolite application under 70% conventional N. Compared with monoculture maize under conventional N, maize-green manure intercropping combined with zeolite application under 70% chemical N achieved comparable yields. Simultaneously, this practice reduced cumulative N2O and yield-scaled N2O emissions by 36.9% and 39.2%, respectively. This reduction can be attributed to a decrease in soil ammonium-N by 20.9%-57.7%, nitrate-N by 47.7%-51.3%, nitrate reductase activities by 25.3%-34.4% and N2O-producer (i.e., nirS and nirK) abundance by 17.3%-79.4% in denitrification, and an increase in the N2O-reducer (i.e., nosZ) abundance by 40.0%-103.4%. Compared with 100% N input, 70% chemical N treatment reduced ammonium-N by 22.3%-41.0%, nitrate-N by 25.4%-41.0%, and N2O-producer abundance by 17.1%-35.0% in denitrification. Zeolite application reduced denitrifying enzyme activities by 8.2%-12.9%, N2O-producer abundance by 42.5%-56.4%, but increased N2O-reducer abundance by 13.3%-23.3% in denitrification. PLS-PM analysis showed that N2O emission mitigation was mainly related to reduced soil ammonium-N and nitrate-N, decreased N2O-producer abundance, and increased N2O-reducer abundance in denitrification. These findings provide new insights into the fact that intercropping green manure combined with zeolite application effectively mitigates N2O emission by regulating mineral N, N-cycling enzymes, and denitrifier abundances while maintaining maize yield after cutting 30% N input.

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