巢湖浮游藻类的初步研究

巢湖周年先后共出现浮游藻类277种(包括变种),隶属于8门85属。依种类组成的季节变动,均以绿藻门的属,种最多,其次为蓝藻、硅藻,而金藻、黄藻、隐藻、甲藻均极少;从种群数量分析,除冬季外,则均以蓝藻门为绝对优势,占巢湖浮游藻类年平均总数的99.58％,其中微囊藻和鱼腥藻是引起巢湖蓝藻水华的主要种类。

A Preliminary Study of the Plankton Algae in the Chaohu Lake

The Chaohu Lake has an important part to play in shipping, water supply, fish cultivation, sightseeing, etc. However in recent years, water pollution and serious entrophication have increased the frequency of the appearance of blue green algae water-bloom. In order to prevent the Chaohu Lake from being furthur polluted and to make good use of the Lake resources,qua- litative and quantitative analyses of the plankton algae in the Chaohu Lake were made in 1984. There are altogather 277 species (in cluding varieties) of plankton algae at different periods of the year, belonging to eight phylaa and eighty-five genera. Both the common species and the uncommon ones have been analysed. The seasonal changes of species composition and population and the horizontal distribution have also primarily studied. From the viewpoint of the seasonal changes of species composition, the genera belonging to Chlorophyta exist in the greate abundance; the next come the genera of Cyanophyta and Bacillariophyta; and Chrysophyta, Xanthophyta, Crytophyta and Pyrrophyta exist in the least abundance. In regnrd to the population numbers, Cyanophyta dominates all the time except in winter. It reaches 99.58% of the annual average amount of plankton algae in the lake. Microcystis and Anabaena are the chief composition elements that result in serious water-bloom.The number of both the species and cells is greater in the western area of the lake than in the eastern area.