Nitrate-dependent anaerobic methane oxidation(N-DAMO)plays an important role in methane emission reduction in natural environment.In recent years,due to the influence of human activities,the content of microplastics(MPs)in the natural environment had gradually increased.However,the effects of MPs on the ecological distribution and function of N-DAMO archaea remain unclear,and the role of MPs in methane emission reduction remains to be explored.In this study,we examined the activity,abundance,and diversity of N-DAMO archaea in freshwater and marine sediments under different concentrations of polyvinyl chloride MPs using isotope tracing techniques and molecular biology methods.Results showed that polyvinyl chloride MPs significantly increased the activity of N-DAMO archaea in freshwater and marine sediments in the short term.polyvinyl chloride MPs were more effective in stimulating the activity of N-DAMO archaea in marine sediments.The diversity of N-DAMO archaea in both freshwater and marine sediments changed after the addition of MPs,and the community structure of N-DAMO archaea in marine sediments was more susceptible to MPs.
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