Presenter
Dr. Jie Wen, China Institute of Water Resources and Hydropower Research
Co-author(s)
Dr. Fei Yu Bao, China Institute of Water Resources and Hydropower Research
Dr. Ze Shan Li, China Institute of Water Resources and Hydropower Research
Prof. Chun Yu Wang, China Institute of Water Resources and Hydropower Research
Dr. Ming Ming Hu, China Institute of Water Resources and Hydropower Research
Sub-theme
4. Supporting Aquatic Ecosystem Health and Functions
Topic
4-4. Ecological restoration of degraded rivers and lakes
Body
Microbial communities play active roles in the phosphorus cycles and influence the aquatic environment. Water and sediments samples were collected in Xiangxi river（a tributary of Yangtze river, China） to analyze the spatiotemporal variations and relationships of phosphorus and bacterial communities. We studied the physicochemical properties, include phosphorus contents, nitrogen contents, dissolved oxygen, conductivity, and microbial communities from samples in Xiangxi river during spring and summer seasons. In summer, the total phosphorus concentration was higher, and the bacterial communities were richer and more diverse compared with the value in spring. The distribution of total phosphate concentration in the water samples showed a downward trend from estuary to upstream, and the phosphate value in the overlying sediment water was lower than that in the surface water samples. Compared with the distribution of dissolved phosphate in water samples, it showed a gradually increasing trend from estuary to the upstream, and the dissolved phosphate value in surface water was relatively low. The results showed spatiotemporal variations, highlighting higher values of the conductivity, nitrogen, enzyme activity in sediments collected in the upstream zone with slow flow velocity. The acidobacteria and betaproteobacteria were the most relatively abundant bacterial taxa in sediment samples, while the exiguobacterium were the most relatively abundant bacterial taxa and predicted function in water samples, respectively. For acidobacteria betaproteobacteria, and exiguobacterium, the function of metabolism was higher than information storage and processing, and cellular processes and signaling. The water and sediments were also revealed and the relationships between bacterial community and P-associated parameters were confirmed. This study represents an initial investigation aimed to unravel the compositions and relationships of bacterial communities and function genes with P recycling in these sediments, which are threatened by eutrophication. This information may be used in the design of countermeasures to prevent deterioration of Xiangxi rivers, which are relevant as ecosystem service providers.