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Physico-chemical properties and photosynthetic production by phytoplankton of Lake Kasumigaura were investigated in the summer of 1971. Suspended organic matters were markedly abundant in the lake water, and the most part was presumed to be composed of phytoplankton. Whole the water column belonged to the euphoric zone and the lake was very productive. The water pollution of the lake is considered to be the secondary organic pollution caused by the growth of blue-green algae; its main factors are inflow of inorganic nutrients from the surrounding areas, characteristic contour with large but shallow water body, and a long retention time of lake water. High photosynthetic production is kept by enriched inflows and most of particulate organic matter synthesized by the primary producers is retained in the lake. Thus eutrophication and pollution of the lake may be progressed.
- 日本陸水学会の論文
日本陸水学会 | 論文
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