20余年来缙云山黛湖鼓藻类植物的演变与水质的关系

对黛湖鼓藻类植物进行的调查研究发现，黛湖鼓藻类植物的种类逐年减少。1986～1988年为108种，减少了24种，1990-1992年为63种，减少了69种，1993-1995年为52种，减少了80种，1997-2000年为48种，减少了84种，2002-2004年为50种，减少了82种．利用Shannon-Wiever物种多样性指数分析，黛湖水质除1990-1992年为中度污染外，其余年份为微污水质，与Whittaker多样性指数、生物多样性指数以及指示藻类反映出的水质状况基本吻合．

The Relationship Between the Water Quality and the Evolution of the Algae of Cosmarium in Dai Lake of Jinyun Mountain over 20 Years

According to the reports in the years 1982 and 1984,there are 132 species of cosmarium in Dai Lake(mutants included).But the later research found that the algae of cosmarium in Dai Lake were on the decrease with each passing year:108 species existed in 1986-1988,24 species disappeared;63 in 1990- 1992,69 disappeared;52 in 1993-1995,80 disappeared;48 in 1997-2000,84 disappeared;50 in 2002- 2004,82 disappeared.The Shannon-Wiever Species Diversity Index have showed that the water quality of Dai Lake is little-polluted in most years.Except during 1990-1992,it's mid-polluted.These situations are considerably the same comparing with the Whittaker Diversity Index,Species Diversity Index and the wa- ter quality indicated by indicative algae.