팔당댐 담수수역 (湛水水域) 식물 플랑크통의 수직분포 (垂直分布) = Vertical Distribution of Phytoplankton in the Paldang Dam Reservior

다국어 초록 (Multilingual Abstract)

Phytoplankton community was investigated at the Paldand Dam Reservoir in the Mid-Han River by it`s depth, in spring and summer known as the period of phytoplankton`s blooming. It was only in summer that phytoplankton bloomed at the investigated area. 128 kinds of phytoplankton were identified and of them, diatoms were abundunt in spring but cyanophyta and chlorophyta were in summer. Because some species with high pollution index were observed in summer, it could be proved that the investigated area was polluted especially in summer. In spring shown the circulation period by vertical distribution pattern of chlorophyll-a and isothermal distribution pattern of water temperature, maximum value of phytoplankton standing crops appeared at the upper layer, except for surface layer. In summer shown the circulation period after the stagnation period by vertical distribution pattern of chlorophyll-a and immediate destruction after stratification of water temperature, maximum value of phytoplankton standing crops appeared at the lower layer. The layer at which the maximum value of chlorophyll-a appeared also accorded with that of phytoplankton standing crops. So, it could be approved that there existed a close relationship among phytoplankton standing crops, chlorophyll-a, and water temperature.