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嚴圭白 한국식물학회 1973 Journal of Plant Biology Vol.16 No.3-4
The physico-chemical factors, the distribution of chlorophyll and the primary production of the lakes Hwajinpo, Yongrangho, Chunchonho, Uiamho, Soyangho and Changjamot have been studied in order to make ecological comparison among these lakes during summer stagnation period of August to September of 1973. On the basis of the characteristics of these lakes, the lake types have been discussed. Thermocline is observed at 3-4m zone in the lake Changjamot and 4-5m zone in the lake Yongrangho. In the case of lake Hwajinpo and impoundments, the distinct thermal stratification is not observed at the summer stagnation period. As to vertical distribution of dissolved oxygen, a positive heterograde curve is obtained in the lakes Hwajinpo and Yongrangho. In the lake Changjamot the typical clinograde curve and the oxygen depletion in hypolimnion are observed. In the case of impoundments, however, the orthograde curve is observed in the lakes Chunchonho and Uiamho. While in the lake Soyangho, any stratification of the dissolved oxygen is not found. In the brackish lakes, such as lakes Hwajinpo and Yongrangho, the salinity of hypolimnion is found to be much higher than that of epilimnion. In the lake Hwajinpo, the salinity of hypolimnion is exhibited 32.7‰, which is nearly the same as sea water. The distribution of nitrogenous compounds and phosphates is found to be high in the lake Changjamot. The silicate is also found in high concentration in the lake Chunchonho, and the distribution of nutrients in the brackish lakes is generally low. As to the vertical distribution of chlorophyll level, the lake Changjamot shows a stratum type and the brackish lakes L-type stratification. In the impoundments, lakes Chunchonho and Uiamho appear to be homogeneous trpe. Seasonal variation of chlorophyll level in the lake Changjamot is examined from January to September 1973. The vertical distribution of chlorophyll during the period of circulation from January to April is homogeneous type and is stratum type thereafter, The maximum chlorophyll level is 277.4㎎/㎡ on June 23 and the pattern of seasonal variation of chlorophyll level is comparable to the type of eutrophy. The horizontal distrbution of chlorophyll level is studied in the brackish lakes, Hwajinpo and Yongrangho. The pattern of distribution is found to be an irregular type. On the basis of measurements of primary production by means of the carbon-14 method and the distribution of chlorophyll level, it is concluded that the interior part of the lake Hwajinpo and Changjamot are eutrophic and the exterior part of the lake Hwajinpo, lake Yongrangho and the impoundments, lakes Uiamho and Soyangho are mesotrophic.
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.