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RISS 인기검색어
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- 저자 : 박양생 ( Kyu Song Cho (검색결과 1 건)
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조규송,박양생 ( Kyu Song Cho,Yang Saeng Park ) 한국하천호수학회 1969 생태와 환경 Vol.2 No.1·2
The study of typical brackish water, Yong-nang lake, which is situated at the east seaside of Korea had been done from March, 1964 to August, 1968. The results obtained are as follows. 1. The difference of water temperature between epilimnion and hypolimnion in the lake is deeply appeared in Aug., Sept., Oct., Dec., and Jan. The possible range of water temperature is average 14℃, and katotherm and thermocline is revealed in 2 -4m during the period toward autumn from summer, respectively. 2. Being accumulated the gyttia which is the source of non-organic salt at the bottom, anaerobic layer increasing take place in summer. The fact that the salinity of the lake in summer attained higher content at 2 -5m layers than annual average values is caused by the inflow of seawater. It is generally considered that a lots of residual salt at the bottom is connected with the decomposition of the bottom. The concentration of salt is unstable and is seasonally variable. So the lake belongs to mixo-mesobaline of the mixoeuhaline. 3. Because the range of pH value (6.6-7.2) is less than average pH value (7.0-8.0) that fishes are suitable to live in, it must be considered that the selection of fitter fish for raising is important. 4. The content of dissolved oxygen in the lake is 6.8cc/l in mid-summer and the condition is suitable to aquatic organisms or plankton for raising. 5. The content of N.P. and K salts is 0.2-0.35ppm, 0.02-0.05 ppm and 1.1-1.4 meq/l, respectively and the lake belongs to mesotrophic. 6. As the lake is brackish water, plankton flora of fresh water and sea water are mixed up each other. Chlorophyceae of phytoplankton is abundant in the lake because the species is often inflowed into the lake from around stream and paddy field. Bacillariophyceae is the abundant species of the Chlorophyceae and the species of fresh water and sea water is distributed in the peat. The fact that Rotifera, Clodocela and Copepoda of zooplankton is simmiliar with the content of fresh water ones but Notholca and Ceratium fusus is generally abundant is a characteristic of microfauna in brackish water.
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