Abstract
In order to solve the poor self-purification ability of low temperature water in winter, the microbial community structure in the sediment of Pi River water (located in West Anhui) was investigated experimentally in this study. Firstly, the sediment was sampled in the lower reaches of Pi River and prepared with the different pH (5.0, 5.5, 7.0 and 8.5); secondly, the prepared samples were tested by the high-throughput sequencing technology and the tested results showed that more than 40% of the bacteria in the sediment samples had an average relative abundance of less than 1.5% and the bacterial community was relatively dispersed and diversified; the relative abundance of Acidobacteria was the lowest, while Proteobacteria and Bacteroidetes were the opposite; additionally, the abundances of Nitrosomonadaceae, Nitrospirae and Nitrosomonadales samples (pH = 5.5, 7.0 and 8.5) were all less than 5%, while the abundance in pH = 5.0 samples was less than 1%; the specific species of alkaline sample is 0, because acidity had a great influence on the structure of microbial community, especially nitrifying bacteria, furthermore, the optimal environment for bacterial growth in sediments had an acidity threshold. Accordingly, this paper will provide a reference for the poor self-purification of water at low temperature in winter.
Highlights
In recent years, the level of urbanization in China has been continuously improved and the pollution of life, agriculture and industry to urban rivers has been increasing, the results of which the pollution of urban water environment is becoming more and more seriously
Microorganisms in sediment play an important role in the circulation of river ecosystem (Billard et al, 2015; Kaestli et al, 2017), as well as a certain role in regulating river ecosystem, their diversity and community structure are affected by the varies of environmental factors, such as physical chemistry and biological parameters of environmental conditions (Lapanje et al, 2005; Lundgaard et al, 2017; Tiquia, 2010)
Some researchers implemented that microbial community structure or specific microbial functional groups was used as an important tool to evaluate the heterogeneity or ecological stress of river sediment (Jalili et al, 2018; Kaestli et al, 2017; Xie et al, 2016), the results indicated that the temporal and spatial varies of physical and chemical properties of sediment would inevitably lead to corresponding changes in microbial community structure and the number of specific microbial functional groups (Kaestli et al, 2017; Torres-Alvarado et al, 2016; Chen et al, 2015)
Summary
The level of urbanization in China has been continuously improved and the pollution of life, agriculture and industry to urban rivers has been increasing, the results of which the pollution of urban water environment is becoming more and more seriously. This study intends to sample from the winter Pi River bottom sludge and research the community structure of sediment microbes in the sample by changing the acidity-basicity.
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