Limnological Features of Lake Yogo-ko just after the Fall-overturn
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概要
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Further observations on the physico-chemical and biological properties of Lake Yogo-ko were made just after the fall overturn. Lacustrine factors did not show a definite vertical stratification at any location, but two water masses were detected in the lake : one is a nutrient rich colder water mass at the northern part and the other is a relatively nutrient poor warmer water mass at the southern part. Standing crop of phytoplankton assessed by chlorophyll-a was about 88 mg/m<SUP>2</SUP>. This value was approximately two times higher than those in summer. A photosynthetic activity of phytoplankton <I>in situ</I> measured on a cloudy day was 11 mg CO<SUB>2</SUB>/mg. chl./day and a daily net primary production was 0.44 g CO<SUB>2</SUB>/m<SUP>2</SUP>/day. These values were nearly one-half of those measured on sunny day in summer, but a potential photosynthetic activity was almost the same order compared with that of summer phytoplankton.
- 日本陸水学会の論文
日本陸水学会 | 論文
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