玄武湖蓝藻水华成因探讨

为了解南京玄武湖蓝藻水华的成因，对玄武湖长期监测资料进行了分析和现场调查。结果表明，玄武湖鲢鳙急剧减少中断了正常的食物链，使浮游植物的牧食压力降低，在东南湖回水的诱因作用下，发生了以微囊藻为优势种群的蓝藻水华。指出，玄武湖蓝藻水华的发生进程表明，东南湖回水可能是蓝藻水华发生的诱因，生态失衡是蓝藻水华发生的主要原因，蓝藻水华的暴发与富营养化程度无显著相关性，其暴发加重了玄武湖富营养化程度。

Study on the ReasonsofBlue Algain Xuanwu Lake ofNanjing

In order to find out the reasons of blue alga in Xuanwu Lake, this article had investigated the long-term monitoring information of Xuanwu Lake and the results had shown that the most important reason is sharp decline of two kinds of fishes, so that the normal food chain was interrupted and the amount of phytoplankton was increased in short time with the reason of circle water in its East-South part. The eruption course of blue alga had shown that its inducement was because of circle water in its East-South part, and its main reason was entironment unbalance. In addition, there is no relativity between the pollution of blue alga and the degree of over-enrichment, and the eruption of blue alga will aggravate the level of over-enrichment of Xuanwu Lake.