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장자못의 생태학적 연구 - 제Ⅰ보 환경요인과 생산구조에 대하여 -
엄규백,홍영정 ( Kyu Baek Uhm,Young Nam Hong ) 한국하천호수학회 1969 생태와 환경 Vol.2 No.3·4
The productive structure of phytoplankton community in Lake Changja was studied by the vertical variation of chlorophyll-a amount in relation to the changes of environmental factors. The thermal stratification was formed at the beginning of June, and was continued until the late of summer. The range of Secchi disc transparencies was from 0.5m to 1.9m in the Lake Changja and the deepest was found in middle of June, and lowest was late July and August. The pH value was increased from May to October and it was thought of depending the increasing of phytoplankton. According as its depth become deeply, the vertical distribution of pH values was decreased. Oxygen content of surface waters was from 7.46 (in July) to 10.4 (in September) mg O₂ per liter, correspond to a range in saturations from 96.4 to 129.8%, the mean being 113.1%. In bottom layer, the oxygen content was declined and in the late of July the oxygen content was 0% in saturation. The small quantities of nitrite present in surface waters show marked seasonal variation. In Lake Changja, nitrite was always present and the minimal quantities occured in the latter part of summer stagnation. In general, maximal amounts of nitrate was present at the vernal circulation period in Lake Changja and during the summer months, the nitrate concentration remains low. The concentration of phosphate during the late spring months (May-June) and the autumn months (September-October) was lower than during the summer months (July-August) and it may be due to reduction of phosphate by the phytoplankton. The silicate concentration is usually increased in summer at 4-5m layer of the lake and these silicate concentration tend to increase until October, and maximal amounts of silicate was found in October. In vertical distribution of chlorophyll amounts, there are two main types; i.e., the one is homogenous distribution in which phytoplankton is distributed homogenously, and the other is stratum distibution in which the stratification of chlorophyll concentration is observed. The vertical distribution of chlorophyll amounts as a productive structure has almost always formed a stratum distribution in Lake Changja. In June, a zone which has the maximum chlorophyll content appeared in the bottom layer (L-type) and in August, it appeared in the surface layer.