Potential effect of biogas slurry application to mitigate of peak N2O emission without compromising crop yield in North China Plain cropping systems

文献类型： 外文期刊

第一作者： Zou, Zhichao

作者： Zou, Zhichao;Zhao, Zichao;Zou, Zhichao;Ren, Xueqin;Du, Zhangliu;Li, Yue;Wu, Di;Zhao, Zichao;Zhao, Zichao

作者机构：

关键词： Biogas slurry; Nitrous oxide; Crop yield; Isotopomer; Nitrifier; Denitrifier

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：5.0； 五年影响因子：5.4 ）

ISSN： 0929-1393

年卷期： 2025 年 210 卷

页码：

收录情况： SCI

摘要： Biogas slurry (BS) produced from anaerobic digestion of livestock manure can be benefit for crop yields and soil fertility in cropping systems as compared to sole synthetic fertilization, but its impact on nitrous oxide (N2O) emissions is inconsistent in the literatures. The North China Plain (NCP) serves as a vital agricultural region in China, contributing approximately 40 % of the nation's total wheat and maize production. However, owing to the lack of relevant field studies, the understanding of how BS affects crop yield and N2O emissions in NCP remains unclear. Here, we assessed the effects of BS substitution (0 % substitution, CF; 50 % substitution, 50%BS; 100 % substitution, 100%BS) on the amount and sources of N2O emissions by monitoring N2O fluxes combined with the isotopomer ratios of soil-derived N2O in the NCP. The results showed that, compared with the control, CF, 50 % BS, and 100 % BS significantly increased wheat grain yield by 66.1 %-67.9 % and silage maize yield by 46.3 %-53.3 %, respectively. Compared with CF, 50%BS reduced N2O emissions by 40.1 % in the wheat season and by 35.5 % maize season, while 100%BS reduced N2O emissions by 31.9 % in the wheat season and by 49.2 % in the maize season. Further site preference analysis revealed that nitrification and fungal denitrification together contributed to 40.3-44.9 % of the peak N2O emissions in CF, 50%BS, and 100%BS, with no significant differences in SP values among them. Compared with CF, 100%BS significantly reduced the copy numbers of AOBamoA, nirK, and nirS by 65 %, 41 %, and 35 %, respectively, which may be key factors in reducing N2O emissions. Our results showed that the partial substitution of chemical fertilizers with BS is an efficacious practice for maintaining crop yields while simultaneously reducing N2O emissions in the NCP.

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