|关键词: 富营养化 非点源污染 洱海
|Study on eutrophication of Erhai Lake
Dali Prefectre Environmental Science Institute Yunnan 671000
|Erhai Lake,located in the central part of the Dali Bai National Autonomous Prefecture,extending from Eryuan County to Dali City,at 100°05'-l00°17'E and 25°36'-25°58'N,is the second largest fresh water lake in Yunnan Province with a surface area of 2565km2,catchment area of 2565km2, and mean and maximum depths of 10.5m and 20.5m,respectively and capacity of 28. 8×108m3.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.
|Key words: Eutrophication pollution of nonpoint sources Erhai Lake