Characteristics of microbial community structure and influencing factors in rivers entering Changdang Lake during the wet season
To understand the structural characteristics of microbial communities in rivers entering Changdang Lake and the response relationship with environmental factors,this study classified these communities based on the comprehensive assessment of the primary rivers flowing into Changdang Lake and the types of pollutant sources.The distribution characteristics of seven physicochemical indices were analyzed in rivers entering Changdang Lake,including dissolved oxygen(DO),pH,ratio of total nitrogen to total phosphorus(TN/TP),water temperature(WT),total organic carbon(TOC),total nitrogen(TN)and total phosphorus(TP).The differences in the structural characteristics of microbial communities and the relationship between microbial communities and physicochemical factors were analyzed based on 16S rRNA high-throughput sequencing technology with Circos,ANOSIM and redundancy analysis(RDA).The results showed that the dominant phyla and genera of microorganisms in rivers entering Changdang Lake with various pollution types were similar,though the relative abundance differed.The dominant phyla included Proteobacteria,Actinobacteria and Bacteroidetes;the dominant genera included hgcI clade,CL500-29 marine group,Acinetobacter,Comamonadaceae-Unclassified and Hydrogenophaga.ANOSIM analyses showed that the microbial community structure characteristics of rivers entering Changdang Lake were related to the type of pollution source.The results of redundancy analysis(RDA)showed that pH and TP were significantly associated with the dominant phylum of bacteria in rivers entering Changdang Lake(P＜0.05);DO and pH were extremely associated with the dominant genus of bacteria in rivers entering Changdang Lake(P＜0.05).The microbial communities in rivers entering the Changdang Lake were highly diverse at the phylum and genus levels and were correlated with type of pollution sources and physicochemical factors,which provided basis for the pollution prevention and ecological restoration of rivers entering the Changdang Lake.
国家科技期刊平台
NSTL
万方数据
