Magnesium modified biochar facilitates favorable nitrogen conversion to mitigate ammonia and nitrous oxide emissions during pig manure composting

文献类型： 外文期刊

第一作者： Gu, Xuhan

作者： Gu, Xuhan;Li, Hui;Shi, Yixun;Sun, Cun;Li, Shuyan;Li, Jijin

作者机构：

关键词： Composting; Mg-modified biochar; Nitrogen conversion; Microbial community; Functional genes

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2025 年 504 卷

页码：

收录情况： SCI

摘要： This study aimed to reduce NH3 and N2O emissions and to investigate how Mg-modified biochar affected nitrogen conversion during composting. Results showed that Mg-modified biochar improved the composting performance with its more excellent porous structure and functional groups, thereby directly mitigated NH3 and N2O emissions or indirectly by regulating microbial community. Compared to control, adding Mg-modified biochar decreased NH3 and nitrogen losses by 18.0 %-37.4 % and 31.3 %-37.9 %, respectively. Especially, adding 5 % of Mg-modified biochar achieved the best nitrogen conservation and maturity performances. Mgmodified biochar promoted the reproduction of nitrogen-fixing (e.g. Peanibacillus) and amonifying bacteria (e. g. Corynebacterium), thereby enhanced nitrogen metabolism. The expressions of hao and nxrAB genes were elevated with the addition of Mg-modified biochar to facilitate the reduction of NH3 emission. Mg-modified biochar mitigated N2O emission with the reduction of denitrifying microorganisms to reduce N2O production and the increase of nosZ gene to increase N2O consumption.

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