太湖东部水域浮游硅藻群落特征及其与环境因子关系

对太湖东部水域9个点位浮游硅藻的群落结构进行了分析。结果表明,9个点位的生物多样性处于一般到较丰富状态,其水质为中污染到轻污染;硅藻群落的物种丰富度、生物量和密度因水域地形特点、换水周期等因素出现差异,在半封闭水体中的物种丰富度较差,生物量和藻密度较高,优势种所指示的水质处于中等偏下水平。硅藻相对多度和各项环境因子冗余分析显示,总磷(TP)对群落的组成和分布影响显著。东北部水域浮游硅藻群落主要受到TP和浊度(NTU)的影响,东南部水域浮游硅藻群落受到TP和NTU的影响则很小。

The Relationship between Planktonic Diatom Community and the Environmental Factors of the Eastern Eastern Taihu Lake

In order to study the indication and evaluation of diatom community on water quality in the water source,this study analyzed the community structure of nine planktonic diatoms in the eastern waters of Taihu Lake,the results show that the biodiversity of the 9 sites is from moderate to abundant,indicating that the water body is in a medium to light pollution state.In addition,the species richness,biomass,and algae density of diatom communities vary due to factors such as the topography of the water area,the water exchange cycle,and other factors.The species richness in semi-enclosed water is poor,and the biomass and algae density are high.The probability of dominant species at different points in different water quality was analyzed,and the results showed that the water quality in the eastern waters of Taihu Lake was at a moderately low level.The ecological indicator values of dominant species also indicate that these dominant species are mostly polluted species.The results are highly consistent with the aroma concentration index and water quality index,indicating that planktonic diatoms have a good ecological indicator function.The redundant analysis of the relative abundance of diatoms and various environmental factors showed that total phosphorus(TP)had a significant effect on the composition and distribution of the community.The planktonic diatom communities in the northeast waters are mainly affected by TP and NTU,while the planktonic diatom communities in the southeastern waters are affected by TP and NTU.This study shows that the community distribution of diatoms shows regional differences,and this difference is closely related to water quality indicators.