Green manuring combined with zeolite reduced nitrous oxide emissions in maize field by targeting microbial nitrogen transformations

文献类型： 外文期刊

第一作者： Liu, Rui

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

作者机构：

关键词： Green manure; Zeolite; Metagenome; N-cycling functional microbes; 15N labeling; N2O emission factor

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：8.2； 五年影响因子：8.6 ）

ISSN： 0048-9697

年卷期： 2024 年 950 卷

页码：

收录情况： SCI

摘要： Green manure is a crucial strategy for increasing cereal yield and mitigating environmental burden while reducing chemical N fertilizer. To effectively tackle climate change, finding ways to reduce nitrous oxide (N2O) 2 O) emissions from green manuring systems is vital. Herein, field and 15 N labeled microcosm experiments were arranged to investigate the effect and mechanisms of green manuring and zeolite application on N2O 2 O emission. Both experiments comprised four treatments: conventional chemical N (N100), 70% chemical N (N70), N70 with green manure (N70 + CV), and N70 + CV combined with zeolite (N70 + CV + Z). Compared with N100, both N70 + CV and N70 + CV + Z maintained maize yield, cumulative N2O 2 O emissions decreased by 37.7 % and 34.9 % in N70 + CV + Z in 2022-yr and 2023-yr, and by 12.8% in N70 + CV in 2022-yr. Moreover, the reduction of N2O 2 O emission primarily occurred after incorporating green manure. The N100 and N70 + CV demonstrated a similar transformed proportion of chemical N to N2O 2 O (i.e., 4.9% and 4.7%) while reducing it to 2.7% in N70 + CV + Z. Additionally, a mere 0.7 % of green manure N was transformed to N2O 2 O in both N70 + CV and N70 + CV + Z treatments. Compared with N100, both N70 + CV and N70 + CV + Z decreased the relative abundances of ammonia oxidation microbes, increased denitrifier and the ratios of (nirK + nirS)/nosZ and norBC/nosZ. . Furthermore, compared with N70 + CV, N70 + CV + Z decreased the relative abundances of N2O-producer 2 O-producer and the ratios of (nirK + nirS)/nosZ and norBC/nosZ in denitrification. These findings revealed that the reduction of N2O 2 O emissions resulting from green manure replaced chemical N was mainly due to weakened nitrification, while zeolite reduced N2O 2 O emissions attributed to enhanced conversion of N2O 2 O to N2. 2 . Moreover, certain key N-cycling functional bacteria, such as Phycisphaerae, Rubrobacteria, and Thermoflexia, were positively correlated with N2O 2 O emission. In contrast, Dehalococcoidia, Gammaproteobacteria, and Betaproteobacteria were negatively correlated with N2O 2 O emission. This investigation uncovered the underlying mechanisms for effectively reducing N2O 2 O emissions through green manuring combined with zeolite.

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