Suitable fermentation temperature of forage sorghum silage increases greenhouse gas production: Exploring the relationship between temperature, microbial community, and gas production

文献类型： 外文期刊

第一作者： Hu, Yifei

作者： Hu, Yifei;Pan, Gang;Zhao, Meirong;Yin, Hang;Wang, Yibo;Bai, Chunsheng;Sun, Juanjuan;Yu, Zhu;Xue, Yanlin

作者机构：

关键词： Silage; Temperature; Carbon dioxide; Methane; Nitrous oxide; Microbial community

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： Silage is an excellent method of feed preservation; however, carbon dioxide, methane and nitrous oxide produced during fermentation are significant sources of agricultural greenhouse gases. Therefore, determining a specific production method is crucial for reducing global warming. The effects of four temperatures (10 degrees C, 20 degrees C, 30 degrees C, and 40 degrees C) on silage quality, greenhouse gas yield and microbial community composition of forage sorghum were investigated. At 20 degrees C and 30 degrees C, the silage has a lower pH value and a higher lactic acid content, resulting in higher silage quality and higher total gas production. In the first five days of ensiling, there was a significant increase in the production of carbon dioxide, methane, and nitrous oxide. After that, the output remained relatively stable, and their production at 20 degrees C and 30 degrees C was significantly higher than that at 10 degrees C and 40 degrees C. Firmicutes and Proteobacteria were the predominant silage microorganisms at the phylum level. Under the treatment of 20 degrees C, 30 degrees C, and 40 degrees C, Lactobacillus had already dominated on the second day of silage. However, low temperatures under 10 degrees C slowed down the microbial community succession, allowing, bad microorganisms such as Chryseobacterium, , Pantoea and Pseudomonas dominate the fermentation, in the early stage of ensiling, which also resulted in the highest bacterial network complexity. According to random forest and structural equation model analysis, the production of carbon dioxide, methane and nitrous oxide is mainly affected by microorganisms such as Lactobacillus, , Klebsiella and Enterobacter, , and temperature influences the activity of these microorganisms to mediate gas production in silage. This study helps reveal the relationship between temperature, microbial community and greenhouse gas production during silage fermentation, providing a reference for clean silage fermentation.

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