杭州西湖引流冲污前后浮游藻类变化及防治富营养化效果评价

Population variation of phytoplankton in West Lake of Hangzhou before and after diluting sewages with erupting into river water and effect of controlling eutrophication.

1988年4月—1989年4月西湖各湖区浮游藻类逐月分析资料表明,引水冲污后西湖蓝藻个体数量比例从1981年的84.4％下降到69.7％,藻种数118种增至192种;以蓝藻占绝对优势的群落结构特征及多项水质指标的TSI均值表明,西湖水体依然属富营养类型,且有缓慢发展趋势,引水并未根本改变西湖水质特性。根据藻量及多样性指数的方差分析,对各湖区污染及富营养程度进行了多重比较。

In 1988.4—1989.4, monthly investigations on individuals of blue algae in various areas of West Lake showed that after diluting sewages with empting into Qiantang River water, their amounts decreased from 84.4% in 1982 to 69.7%,and the species diversity increased from 118 to 192. The struetura' characteristics of population with blue algae being the dominant and the high TSI index indicated that the water body of West Lake is still of eutrophic and its eutrophication is being slowly developed, and empting into river water doesn't induce any essential variation of water quality. Based on the variance analysis of algae amount and diversity index, the rates of pollution and eutrophication in various areas of this Lake is compared.