Characteristics and influencing factors of microbial communities in polluted sediment of urban rivers under low water level operation
In view of the unclear microbial mechanism of polluted sediment remediation in urban rivers under low water level operation,a study on the characteristics and influencing factors of microbial communities in the polluted sediment of urban rivers under low water level operation was conducted based on the physical and chemical property analysis,metagenomic high-throughput sequencing,and bioinformatics analysis of sediment in different urban rivers at high and low water levels.It is found that Proteobacteria,Actinobacteria,Firmicutes,and Euryarchaeota are the bacteria and archaea with the highest relative abundance under different water level operating conditions,respectively.The Shannon index of bacteria in the sediment under high water level operation is significantly higher than that under low water level operation(p＜0.001),while archaea is the opposite,indicating that the archaeal community may dominate the degradation process of sediment pollutants under low water level operation.Proteobacteria may be the main microbial community involved in the degradation of nitrogen-containing pollutants and nitrogen cycle in the sediment under low water level operation,while Alphaproteobacteria may play an important role in removal of ammonia nitrogen in the sediment.Through mantel analysis of microbial community and environmental factors,it is found that TOC,TN,and NH3-N are the main environmental driving factors of microbial community change in the sediment of urban rivers.Low water level operation can not only effectively reduce the pollution degree of conventional pollution indicators in the sediment,and solve the problem of internal pollution in the sediment,but also significantly reduce the potential harm of pathogenic bacteria in the sediment,and build safer hydrophilic urban river ecosystems.
urban riverspolluted sedimentlow water level operationmicroorganismremediation mechanism
国家科技期刊平台
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