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太湖东部水域浮游硅藻群落特征及其与环境因子关系
陈瑜, 高昕, 景明
江苏省苏州环境监测中心
摘要:
为研究水源地硅藻群落对水质的指示与评价作用,本研究通过对太湖东部水域9个浮游硅藻的群落结构分析,结果显示9个点位的生物多样性处于一般到较丰富,表明水体处于中污染至轻污染状态。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。分析各点位的优势种在不同水质中出现的概率,结果表明优势种所指示的水质处于中等偏下水平。优势种的生态指示值也表明这些优势种多为污生种,该结果与Shannon-Wiener指数、水质指标一致性高,说明了浮游硅藻具有良好的生态指示作用。将硅藻相对多度和各项环境因子进行冗余分析,表明总磷(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。本研究表明硅藻的群落分布呈现出区域差异性,且该差异性与水质指标密切相关。
关键词:  硅藻群落结构 生态指示型 冗余分析 主成分分析
DOI:
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基金项目:太湖典型水源地硅藻水华发生特征及其对水质的影响(1810)
Characteristics of planktonic diatom community and its relationship with environmental factors in the eastern waters of Taihu
Abstract:
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 Lake Taihu 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.
Key words:  diatom communities  ecological indicator type  principal component analysis( PCA)  redundancy analysis(RDA)