巢湖藻类组成与环境因子典范对应分析

2008年5月—2009年5月对巢湖藻类组成及水质的季节变化进行了逐月调查研究。鉴定的藻类共6门31属48种,其中绿藻比例最高,占47.9%。藻类优势种群为蓝藻门的铜绿微囊藻（Microcystic aeruginosa）,出现频度为90.9%。3个采样点藻类群落组成没有明显差异,藻类物种丰富度指数（Margalef值）和藻细胞密度的变化范围分别为0.10~1.84和（12.65~825.00）×106 cell.L-1,且冬季值较低。同时,叶绿素（1.30~41.10μg.L-1）和总磷（0.06~0.48 mg.L-1）含量分别在秋季和夏季显著高于其他季节。典范对应分析（CCA）显示,藻类种群分布受水环境因子的影响较为明显。整体上,TP是影响巢湖藻类种群分布的重要因素。

Canonical Correspondence Analysis of Algae Community and Its Environmental Factors in the Lake Chaohu,China

This research was performed during May 2008 and May 2009 at the Lake Chaohu,aiming to investigate the seasonal variations of algal species and water quality.A total of 48 kinds of algal species belonging to 6 phyla and 31 genera were identified,among which,the species in Chlorophyta accounted for about 47.9% of the total species.The dominant specie was the Microcystic aeruginosa,the frequency of which was 90.9%.No significant difference was found on algal species across three sampling sites.Overall,Margalef values varied from 0.10 to 1.84,while algal density varying from 12.65 to 825.00×106 cell L-1,both showing lower values during winter season.The Chl-a concentrations varied from 1.30 to 41.10 μg·L-1 and TP concentrations varied from 0.06 to 0.48 mg·L-1,both having a significant higher values in autumn and summer.CCA analysis showed that the spatial distribution of algae was greatly affected by the aquatic environmental factors and TP could be the major one.