Microbial Community Structure in Mangrove Sediments of Lianjiang Gaoqiao and Its Correlation with Nutrient Factors
[Objective]To study the microbial community structure in mangrove sediments of Lianjiang Gaoqiao and its correlation with environmental nutrition factors.It provides the basis for understanding the mangrove ecosystem function and mangrove wetland protection in this study area.[Method]The composition,diversity and community structure of microorganisms in the surface sediments of mangrove ecosystems were studied by 16S rDNA high throughput sequencing,and their responses to environmental nutrient factors were investigated by correlation analysis.[Result]The dominant bacterial groups in the sediments of the study area were Proteobacteria,Chloroflexi,Acidobacteria,Bacteroidetes and Gemmatimonadetes.Proteobacteria was the most abundant group,accounting for 46.6%― 68.9%.In microbial α diversity,the Shannon index ranges from 9.95 to 10.34,and the Chao1 index ranges from 1 990 to 2 527.There were significant differences between the middle tidal zone and the high tidal zone(P<0.05).The mass fractions of TP,AP,TN and NH4+in sediments ranged from 383.575-760.283,41.772-97.076,820.201-1 452.442,1.511-9.048 mg·kg-1 respectively.There was significant difference in TP between middle high water zones(P<0.05).The nutrient factors in sediments explained 46%of the microbial community composition at the gate level,among which Total organic carbon(TOC)and total nitrogen were the nutrient factors that had great influence on the community structure.[Conclusion]Microbial diversity was abundant in mangrove sediments in Lianjiang Gaoqiao.Compared with the high tidal zone,the microbial diversity and richness in the middle tidal zone were significantly higher than those in the high tidal zone,and the sampling points in the middle tidal zone were better separated from the high tidal zone.Different types of microorganisms had different degrees of response to environmental nutrient factors.TOC was the key factor affecting the composition and structure of microbial community in sediments in the middle tidal zone,while nitrogen and phosphorus were the main nutrient factors controlling the microbial community structure in the high tidal zone.
mangrove sedimentbacterial community16S rDNA high throughput sequencingdiversityrelativity
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