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Rape straw-driven mitigation of greenhouse gas emissions and key bacterial communities during the treatment of pig farm manure in the ectopic fermentation system

文献类型： 外文期刊

作者： Yi, Ming 1 ; Shen, Qi 2 ; Tang, Jiangwu 2 ; Sun, Hong 2 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Plant Protect & Microbiol, Hangzhou, Zhejiang, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Environm Resource Soil & Fertilizer, 298 Desheng Middle Rd, Hangzhou 310021, Peoples R China

关键词： Ectopic fermentation system; Manure; Rape straw; Greenhouse gas; Mitigation

期刊名称：ENVIRONMENTAL TECHNOLOGY & INNOVATION （ 影响因子：7.1； 五年影响因子：7.1 ）

ISSN： 2352-1864

年卷期： 2025 年 37 卷

页码：

收录情况： SCI

摘要： Rice chaff, sawdust, and rape straw are commonly used as padding materials in the ectopic fermentation system. However, the characteristics of greenhouse gas emissions the ectopic fermentation system using rice chaff, sawdust, as well as the effects of rape straw on these emissions, remain unclear. This study investigated the effects of different proportions of rape straw (0, 10 %, 25 %, and 50 %) on greenhouse gas emission characteristics in this system. The experimental results indicated that the treatment group containing rice chaff, sawdust, and more than 25 % rape straw significantly increased fermentation temperature, prolonged the thermophilic phase, enhanced the maturity of fermentation products, and altered microbial community structures compared to the control group with only rice chaff and sawdust. Redundancy analysis revealed that replacing rice chaff and sawdust with 50 % rape straw significantly decreased the relative abundance of methanogens (e.g., Methanospirillum and Methanobacterium) and denitrifying species (e.g., Denitrificimonas caeni and Aliarcobacter butzleri), resulting in reductions in cumulative emissions of CH4 and N2O by up to 44.6 % and 84.9 %, respectively, compared to the treatment group with rice chaff and sawdust alone. The absolute abundance of the nosZ gene was positively correlated with N2O emissions. Therefore, rape straw has been demonstrated to be an effective padding material that reduces CH4 and N2O emissions while enhancing the maturity of fermentation products in the ectopic fermentation system.

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