ZHONG Meifang1, ZHANG Huayong1, WANG Hualin1, WANG Zhongyu1, TIAN Wang1, HUANG Tousheng1

（1. Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China）

Abstract： To explore the eutrophication of shallow water in the lake sediment bacteria community structure characteristics and driving factors， the sediment bacterial community from a eutrophic shallow lake - Lake Balihe - located in Anhui Province, China, was investigated by using 16S rRNA high-throughput sequencing method combined with the analysis of sediment nutrients, spatially and seasonally. The results indicated that: (1) In terms of species composition, ??-Gammaproteobacteria, ??- Deltaproteobacteria and Bacterodia were the dominant bacteria in sediment, and homogeneous in space and stable in season; (2) For community structure, the sediment bacterial communities were clustered by season as a whole, which showed the intra-seasonal similarity and inter-seasonal difference. The Clostridia derived from fish feces, could be an important contribution to the shaping of bacterial community structure in sediment; (3) From the overall perspective of all samples in four seasons, phosphorus-related factors (total phosphorus, NaOH extractable phosphorus, HCl extractable phosphorus, and organic phosphorus) had significant correlation for bacterial community variations (p < 0.001). The dissimilarity between bacterial communities increased with the increasing dissimilarity within each of these factors. The results from this study provide new information for understanding the traits of sediment bacterial communities and their nutrient driving factors in eutrophic shallow lakes which is meaningful for monitoring and evaluating the health status of lake ecosystems.

Key words：16S rRNA; eutrophic Lakes; community composition; community structure

EARTH AND ENVIRONMENT Vol.51, No.4, Tot No.354, 2023, Page 377