Abstract
Although composting, a measure to dispose agricultural waste, is widely accepted and applied, specific knowledge of microbially driven effects on nitrous oxide (N2O) emissions during composting remains limited. Here, we monitored the impact of sawdust on N2O emissions during pig manure composting. The results suggested that adding sawdust to the compost improved the compost temperature and reduced N2O emissions. The addition of sawdust significantly altered the bacterial community structure and enhanced community turnover during the composting process. The addition of sawdust significantly reduced the relative abundance of denitrification and ureolysis, while increasing the relative abundance of nitrogen fixation. Specifically, adding sawdust may reduce N2O emissions by reducing the relative abundance of Salinithrix, Truepera, Azomonas, Iamia, Silanimonas, Phycisphaera, and Gp21 during the thermophilic and mature phases of the composting period.
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This research was supported by the National Key Research and Development Program of China (2018YFD0201300 and 2018YFD0500201), the Fundamental Research Funds for the Central Universities (KYZ201871 and KJQN201746), the Priority Academic Program Development of the Jiangsu Higher Education Institutions (PAPD), the 111 Project (B12009), and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX19_0550).
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Chao Liu, Rong Li, Biao Shen and Qirong Shen conceived and designed the experiments; Chao Liu, Jiao Yan and Qian Huang performed the experiments; Chao Liu, Jiao Yan, Hongjun Liu and Cece Qiao analyzed the data. Chao Liu, Jiao Yan and Qian Huang wrote the paper. All authors reviewed and edited the manuscript.
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Liu, ., Yan, J., Huang, Q. et al. The addition of sawdust reduced the emission of nitrous oxide in pig manure composting by altering the bacterial community structure and functions. Environ Sci Pollut Res 29, 3733–3742 (2022). https://doi.org/10.1007/s11356-021-15786-2
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DOI: https://doi.org/10.1007/s11356-021-15786-2