洱海富营养化研究

STUDY ON EUTROPHICATION OF ERHAI LAKE

通过1985—1988年对洱海水体的水质、生物等参数的观测分析,研究其富营养现状及变化规律。结果表明,洱海已从1985年的贫中营养型湖泊向中营养型湖泊过渡。其营养状况的变化与流域气候、湖水水位以及非点源污染有关。

Erhai Lake,located in the central part of the Dali Bai National Autonomous Prefecture, extending from Eryuan County to Dali City,at 100°05′—100°17′E and 25°36°—25°58′N,is the second largest fresh water lake in Yunnan Province with a surface area of 250km^2, catchment area of 2565km^2, and mean and maximum depths of 10.5m and 20.5m ,respectively and capacity of 28.8×10~s8m^3. The eutrophication conditions of Erhai Lake is studied by analyzing the data obtained from 1985 to 1988 on water quality and biology properties. The results indicate that in 1985 Erhai Lake began to be from the oligotrophic to mesotrophic due to climate of the catchment, water level fluctuation and pollution of nonpoint sources.