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	Microbial Mediation of Carbon, Nitrogen, and Sulfur Cycles During Solid Waste Decomposition
	Song, Liyan1,2; Wang, Yangqing2; Zhang, Rui2; Yang, Shu3
	2022-06-16
摘要	Landfills are a unique "terrestrial ecosystem" and serve as a significant carbon sink. Microorganisms convert biodegradable substances in municipal solid waste (MSW) to CH4, CO2, and microbial biomass, consisting of the carbon cycling in landfills. Microbial-mediated N and S cycles are also the important biogeochemical process during MSW decomposition, resulting in N2O and H2S emission, respectively. Meanwhile, microbial-mediated N and S cycles affect carbon cycling. How microbial community structure and function respond to C, N, and S cycling during solid waste decomposition, however, are not well-characterized. Here, we show the response of bacterial and archaeal community structure and functions to C, N, and S cycling during solid waste decomposition in a long-term (265 days) operation laboratory-scale bioreactor through 16S rRNA-based pyrosequencing and metagenomics analysis. Bacterial and archaeal community composition varied during solid waste decomposition. Aerobic respiration was the main pathway for CO2 emission, while anaerobic C fixation was the main pathway in carbon fixation. Methanogenesis and denitrification increased during solid waste decomposition, suggesting increasing CH4 and N2O emission. In contract, fermentation decreased along solid waste decomposition. Interestingly, Clostridiales were abundant and showed potential for several pathways in C, N, and S cycling. Archaea were involved in many pathways of C and N cycles. There is a shift between bacteria and archaea involvement in N-2 fixation along solid waste decomposition that bacteria Clostridiales and Bacteroidales were initially dominant and then Methanosarcinales increased and became dominant in methanogenic phase. These results provide extensive microbial mediation of C, N, and S cycling profiles during solid waste decomposition.
关键词	Landfill Solid waste decomposition Carbon nitrogen and sulfur microbial cycles Microbial mediation
DOI	10.1007/s00248-022-02056-y
发表期刊	MICROBIAL ECOLOGY
ISSN	0095-3628
页码	14
通讯作者	Song, Liyan(20023@ahu.edu.cn) ; Yang, Shu(yangshu@cqu.edu.cn)
收录类别	SCI
WOS记录号	WOS:000811470800001
语种	英语