太湖武进港区域浮游植物群落特征及其主要水质污染影响因子分析

2009年7月丰水期和2010年1月平水期对太湖武进港区域13个点的浮游植物进行调查,丰水期共鉴定出浮游植物6门24科46属,以绿藻和蓝藻居多,平均密度为14.8×10^6cell/L;平水期共鉴定出浮游植物5门18科29属,以硅藻为优势门类,平均密度为3 113 cell/L.浮游植物群落结构季节差异显著,丰水期密度...

Analysis on the Key Water Quality Factors to Phytoplankton Community in Wujingang Region of Taihu Lake

Field investigations on the phytoplankton community were carried out in July 2009 and January 2010 in Wujingang Region of Taihu Lake (WRTL). Results show that there are 46 genus, 24 families and 6 phylum phytoplankton were identified in wet season, which is mainly composed of the Chlorophyta and Cyanophyta, the average phytoplankton abundance of this season is 14.8×10⁶ cell/L. There are 29 genus, 18 families and 5 phylum phytoplankton were found in level season, and Diatoms were the dominant category, the average phytoplankton abundance of the season is 3113 cell/L. It shows that a remarkable discrepancy in community and density between the two seasons. The principal component analysis(PCA) and canonical correspondence analysis(CCA) were used to assess the phytoplankton community structure with regard to 8 aquatic environmental factors and their spatial distribution, which result on the key aquatic environmental quality factors show that NH⁺₄-N and TN were the most extraordinary pollution factors which affect the phytoplankton community and WRTL was in extrophication level.