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Effects and driving factors of domestic sewage from different sources on nitrous oxide emissions in a bog

Journal of Plant Ecology 2024年第5期17卷 52-64页

作者： Yue Li Zhongbing Chen Xue Wang Haibo Jiang Chunguang He Yao Shi Lianxi Sheng State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration School of EnvironmentNortheast Normal UniversityChangchun 130000China Key Laboratory for Vegetation Ecology Ministry of EducationNortheast Normal UniversityChangchun 130000China Department of Applied Ecology Faculty of Environmental SciencesCzech University of Life Sciences PraguePraha-Suchdol 16500Czech Republic College of Engineering Jilin Normal UniversitySiping 136000China

Direct sewage discharge may enhance soil nitrous oxide(N_(2)O)emissions,worsening the greenhouse ***,the effects of sewage discharge into bogs on N_(2)O flux,drivers and influencing mechanisms remain ***,investigating the impact of reclaimed water on N_(2)O flux is important for bog replenishment and water shortage *** study simulated sewage from different sources into a bog and analyzed N_(2)O fluxes,soil(organic carbon,total nitrogen,ammonium nitrogen,nitrate nitrogen,total phosphorus,available phosphorus,pH and electrical conductivity),plant(species richness and biomass)and microorganisms(ammonia-oxidizing archaea,napA,nirS,nirK and nosZ genes).Results showed that the reclaimed water did not significantly change N_(2)O flux,while 50%tap water mixed with 50%domestic sewage and domestic sewage significantly increased the N_(2)O *** soil factors,available nitrogen and pH were key in influencing N_(2)O *** plant parameters,species richness was the primary factor affecting N_(2)O *** transformation functional genes contributed the most to the increase in the N_(2)O fluxes,with an increase in domestic sewage input leading to a higher abundance of these genes and subsequent N_(2)O ***,domestic sewage should be considered,as it significantly increases N_(2)O emissions by affecting the soil,plants and microorganisms,thereby increasing the global warming *** study’s findings suggest that using treated reclaimed water for bog replenishment could be an environmentally friendly approach to wetland management.

关键词： sewage bog N_(2)O flux species richness nitrogen transformation functional microorganism

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