蘑菇湖水库浮游植物与富营养化关系初探

RESERCM ON THE RELATION BETWEEN PHYTOPLANKTON AND EUTROPH-ICATION PROCESS IN MOGU LAKE

根据在蘑菇湖一个水文年度进行的7次调查结果,研究了蘑菇湖浮游植物群落生态学的主要变化(包括数量、种类组成、优势种类、季节变化、多样性指数和初级生产力),年平均总数为1138万个/升,年数量变动曲线为夏季的一个蓝藻高峰,而且数量大,延续时间长,冬季以蓝藻和绿藻占优势,夏季转为以蓝藻、硅藻占优势。结果表明,蘑菇湖的富营养化现象在调查的14个月中都存在。

Summarizing the data of phytoplanktonon surveys made in July l987-August 1988 in Mogu lake from the main ecological changes in phyloplanklon asscialion (abandascc and specics compostition, dominant species and seasonal variations, diversity index and primary prodaetion). Average annual abundance of planktonic alagc is 11.38 million individuals perl of water. In the pal-Urn of seasonal fluctuation of phytoplankton abundance the maximum population is a blue algae in the summer, which becomes more predominant and lasts longer than before. Dominance of green algae in winter is gradually replaced by green and blue algae in summer, cutrophication in Mogu lake cxsisls in 14 month's investigation.