Mechanisms of N2O emission reduction during agricultural straw composting: functional gene regulation and bacterial community dynamics mediated by exogenous microbial inoculants
文献类型： 外文期刊
作者： He, Yuewei 1 ; Hu, Fenglong 1 ; Du, Zan 1 ; Liu, Ping 1 ; Cui, Xinwei 3 ; Cai, Yixiang 4 ; Zhao, Xichen 5 ; Qi, Renli 6 ; Huang, Hongli 1 ; Yan, Binghua 1 ; Chen, Anwei 1 ; Zhang, Jiachao 1 ;
作者机构： 1.Hunan Agr Univ, Coll Environm & Ecol, Changsha 410128, Hunan, Peoples R China
2.Yuelushan Lab, Hunan Agr Univ area, Changsha 410000, Hunan, Peoples R China
3.Hunan Acad Agr Sci, Hunan Cultivated Land & Agr Ecoenvironm Inst, Changsha 410125, Hunan, Peoples R China
4.Hunan Univ Humanities Sci & Technol, Dixing Rd, Loudi City 417000, Hunan, Peoples R China
5.Chinese Acad Sci, Inst Subtrop Agr, Changsha 410000, Hunan, Peoples R China
6.Chongqing Acad Anim Sci, Natl Ctr Technol Innovat Pigs, Chongqing 402460, Peoples R China
关键词： Composting; N2O emission reduction; Thermophilic bacteria inoculation; Nitrogen cycling functional gene; Crucial factors
期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.4； 五年影响因子：8.6 ）
ISSN： 0301-4797
年卷期： 2025 年 392 卷
页码：
收录情况： SCI
摘要： This study investigated the effects of exogenous microbial inoculation on nitrous oxide (N2O) emissions, N2O-related gene expression, and bacterial community structure during straw composting. The study found that the inoculation of thermophilic bacteria and the combined inoculation of thermophilic bacteria and decomposition agent reduced N2O emissions by 33.3 % and 50.8 %, respectively. The inoculation of exogenous microbial agents altered the physicochemical properties, functional genes, and the contribution of bacterial communities to N2O emissions. The amoA gene was a key gene significantly affecting N2O emissions (P < 0.001). Proteobacteria was the main potential hosts of N2O-related functional genes and significantly influenced the gene abundances of nxrA and nirS (P < 0.01). Through the Partial least squares path modelling model, it was found that physicochemical properties were the most direct and crucial factors in regulating N2O emissions. The research findings offer novel ideas and theoretical support for applying microbial agents to the resource utilization of straw and the regulation of N2O emissions during composting.
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