Microbial Community Analysis in Surface Sediments of Wujiang Cascade Reservoirs Based on 16S rRNA High-throughput Sequencing
Microbial communities play an important role in the material cycling in lake sediment ecosystems.However,there are only a few studies on sediment microbes in the reservoirs formed by large-scale cascade damming.Here,the diversity and composition of microbial communities in different reservoirs,as well as their responses to environmental factors were analyzed in the surface sediments of seven cascade reservoirs in the main stream of the Wujiang River.The results show that the α-diversity index of microbial communities generally decreased from upstream to downstream in the surface sediments of the Wujiang cascade reservoirs.The β-diversity reveals that the microbial communities of Hongjiadu and Wujiangdu Reservoir were different from the others.This may be due to their longer reservoir age and stagnation time.Proteobacteria is the dominant phylum(17.28％-30.40％)at the level of microbial community in all reservoir sediments,and Gammaproteobacteria is the major phylum at the class level(12.14％-28.08％).Reservoir age is the main environmental factor controlling the structural characteristics of microbial communities in surface sediments.The diversity and stability of microbial communities decreased with increasing reservoir age,and the construction of microbial community is mainly governed by the stochastic process.This study reveals the evolution mechanism of microbial communities in cascade reservoirs of different ages,delivering an indispensable scientific basis for the reservoir development and the sustainable use of water resources.
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