金剛山댐 建設에 따른 北漢江 上流 水域의 環境 모니터링에 관한 硏究 = Monitoring of the Environmental Effects of Keumkangsan Dam on the North Han River

다국어 초록 (Multilingual Abstract)

Aquatic ecosystem was studies in Lake Paro to monitor the effects of the Keumkangsan Dam construction in North Korea. Water quality, primary prodectivity, and microbes were serveyed bimonthly in 1987. The texture and composition of sediments, and meterological sapects were also investigated.
The most remarkable change of water quality was the increase of turbidity. due to the dam construction. Overall chemical and biological aspects were greatly changed because of the high turbidity.
The concentration of phosphate increased and subsequently phytoplankto standing corp increased. The effect of phosphate increase was compensated by the decrease of light penetration, and, therefore areal primary prodectivity was not so high as expected from the chlorophyll concentration.
From the standing corp of microbes, the trophic state of lake Paro was evaluated as mesotrophy. As for the horizontal variation of microbial activity, the microbial heterotrophy was higher in the upstream regions than in the downstream regions.
Sediment types are almost clayey silt and the mean sizes of sediments were homogeneous through the whole lake area. Organic carbon contents of the sediment seemed to be influenced by seasonal variation of primary productivity.