长江口浮游植物群落的聚类分析

Cluster analysis of phytoplankton communities in the Yangtze River estuary during summer

根据2003年8月长江口深水航道水生态调查20个站点所采集的浮游植物样品,对长江口丰水期浮游植物种类组成及群落结构进行了聚类分析。调查区浮游植物种类共检出50种,主要分属3种生态类型。聚类分析将20个站点聚合为3类(类群I、II、III),类群I主要位于长兴岛以西水域,为淡水性群落类型;类群II和III则位于长兴岛以东水域,分别为河口近岸低盐性群落类型和外海高盐性群落类型。上述3个类群中,以河口近岸低盐性群落类型种类最多。结合三个类群的环境指标来看,盐度、悬浮物浓度、浊度在三个类群中差异很大。

Phytoplankton communities in the Yangtze River estuary were studied by cluster analysis based on the samples collected in August 2003, in the cruise for Yangtze River estuary deepwater channel. 50 phytoplankton species were identified and grouped into three eeotypes： the estuarine community, the dilute community and the high salinity community. The estuafine species are the main part of phytoplankton community, which dominates the community feature of Yangtze River estuary. The 20 stations can be separated into three groups （named group Ⅰ, Ⅱ, Ⅲ） by the cluster analysis based on the species composition. Group Ⅰ was in the west area of the Changxing Island, group Ⅱ and group Ⅲ were in the east area of the Changxing Island. According to the environmental factors in which species distributed, salinity, turbidity and suspended sediment were different significantly with each other.