太湖蠡湖浮游植物群落特征及其对水质的评价

2007年冬季（1月30日）和春季（3月27日）对太湖蠡湖进行两次全面调查。采用种类相似性指数、优势指数、多样性指数和污水生物系统等多项生物学指标分析浮游植物群落特征；并结合理化指标评价蠡湖水质营养状况。结果表明：蠡湖共检出浮游植物8门，88种；其中以绿藻门种类最多，共48种，占总种数的5455%；硅藻门次之，共15种，占总种数的1705%。两次调查中各个站位的优势种均为绿藻门种类，其中冬季的优势种为小球衣藻〖WTBX〗（Chlamydomonas microsphaera）〖WTBZ〗，优势指数变化在7143%~9628%，春季优势种为小形平藻〖WTBX〗（Pedinomonas minor）和小球藻（Chlorella vulgaris）〖WTBZ〗，优势指数变化在6702%~8259%，优势种非常明显。浮游植物相似性指数测算结果显示，冬季和春季的浮游植物种类组成差异很大，相似性指数仅为030。同时，生物学评价显示，蠡湖冬季水质劣于春季，与化学评价结果相一致；但从评定级别看，生物评价认为，2007年冬、春季节蠡湖水质分别处于重污染和中度污染状态，较化学评价的污染程度重，显示出两种方法的差异性。

PHYTOPLANKTON COMMUNITY CHARACTERISTICS AND ITS ECO-ASSESSMENT ON WATER QUALITY IN LIHU LAKE,TAIHU LAKE

Lihu lake,Taihu lake was investigated in winter(January 30th) and Spring(March 27th),in 2007,respectively.Biological indexes such as similarity index,predominance index,diversity index and Kolkwitz-Morsson pollution system were used to analyze the community characteristic of phytoplankton.Furthermore,both biological indexes and physical-chemical indexes were used to evaluate the water quality of Lihu lake.Results showed that 88 species and varieties,and 8 phylum of phytoplankton were detected in water sampl...