Abstract
Water samples taken from the center of Lake Kasumigaura (Nishiura and Kitaura) which was an eutrophic lake in Japan were measured for the dissolved organic metters during May 1974 to May 1975. And the water samples of Lake Kitaura were determined for dissolved organic carbon (DOG), dissolved carbohydrates (DCHO) and dissolved amino acids (DAA). Relationship between chlorophyll-a as index of phytoplankton and, DOC, DCHO and DAA was discussed. The correlation between chlorophyll-a and DOC and DCHO was observed in Lake Kitaura water. But no relationship between chlorophyll-a and DOG was observed in Lake Nishiura water. Throughout the experimental period, only about 18% of DOC could be attributed to DCHO and DAA carbon and about 22% of DON could be attributed to DAA nitrogen but larger fraction remained to be identified.
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