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When the determinations of the vertical distribution of dissolved oxygen were done in Lake Biwa on August 23rd, 1973, there was found greatly diminished DO as small quantity as 4% in saturation in the bottom water at a depth of 93m off the island of Chikubushima (Table 1, Fig. 2). There was probably present a depression of small area on the bottom. At the two other stations, 85m and 76m deep respectively, east of the above station of 93m deep, oxygen deficiency in the hypolimnion was also observed. The results may indicate a present status of progressed eutrophication in Lake Biwa, which has been known to be in an oligotrophic condition.
- 日本陸水学会の論文
日本陸水学会 | 論文
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