汉丰湖夏季浮游植物群落与环境因子的典范对应分析

Canonical Correspondence Analysis of Summer Phytoplankton Community and Its Environmental Factors in Hanfeng Lake

2013年6~8月对三峡库区汉丰湖的浮游植物群落进行了调查,共检出浮游植物7门72种,优势种为针杆藻、舟形藻、直链藻、卵形藻、栅藻、伪鱼腥藻、平裂藻.浮游植物在东河入口以硅藻为主,南河入口以蓝、绿藻居多.运用典范对应分析对浮游植物与环境因子关系进行研究.结果表明,东河入口物种受水体理化性质影响大,南河入口物种受营养盐含量影响大,影响浮游植物群落结构的主要因子为温度、溶解氧(DO)、p H、总氮(TN)、总磷(TP)、可溶性氮(DN)与可溶性磷(DP).

The phytoplankton community in Hanfeng Lake Reservoir,located in the Three Gorges Reservoir Areas of Yangtze River,was investigated from Jun to August 2013. The results showed that 72 species belonging to 7 phyla of phytoplankton were detected in the water. The dominant species were Synedra,Navicula,Melosira,Cocconeis,Scenedesmus,Pseudoanabaena and Merismopedia. The phytoplankton at the entrance of Donghe River was mainly composed of Bacillariophyta,while that at the entrance of Nanhe River was dominated by Cyanophyta and Chlorophyta. Canonical correspondence analysis was applied to investigate the relationships between the distribution of phytoplankton and the environmental factors. The results showed that the species of phytoplankton at the entrance of the Donghe River were influenced by the physiochemical properties of the water,while those at the entrance of Nanhe River were affected by the nutrient status of the water. The key factors influencing the distributions of phytoplankton were temperature,dissolved oxygen( DO),p H,total nitrogen( TN),dissolved nitrogen( DN) and dissolved phosphorus( DP).