송백류의 (松柏類) 분포를 중심으로 하는 한라산의 수직분포대

엄규백 (Kyu Baek Uhm) 한국식물학회 1962 Journal of Plant Biology Vol.5 No.2

UHM. Kyu Back (Dept. of Botany, Coll. of L. & S., Seoul National Univ.) Altitudinal zones of Mt. Hanla according to Coniferae distribution. Kor. Jour. Bot. V(2) : 17-20. 1962. Attitudinal zones of Mt. Hanla were geoecologically investigated, and compared with climatic index, according to Coniferae distribution. For climatic index, Warmth index was calculated on Mt. Hanla. With the reaultsobtained, the altitudinal zones can be classified into the following three zones: Coniferous forest zone; below 43˚(month-degrees) (above 1,450 m) Deciouous broad-leaf forest zone: 84˚-43˚ (600-1,450 m) Lucidophyllous forest zone: above 84 ˚ (below 600 m)

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.

호소에 (湖沼) 있어서의 생산구조에 관한 연구

엄규백 (Kyu Baek Uhm) 한국식물학회 1971 Journal of Plant Biology Vol.14 No.1

The productivity of summer phytoplankton communities in Lake Hwajinpo, Lake Yongrang and Lake Changja were studied by measuring vertical variation of chlorophyll-a amounts. The author also classified the lake types on the basis of the amount of chlorophyll in the lake water. And in Lake Changja, the seasonal changes of stratification of chlorophyll were studied. In Lake Hwajinpo, the productive structure of the phytoplankton community in summer was found to be L-shaped and of the mesotrophic type. In Lake Yongrang, the productive structure of the phytoplankton community in summer was also L-shaped and of the mesotrophic type. And maximum chlorophyll layer was near the lake bottom below the compensation depth. In Lake Changja, the structure of phytoplankton community in summer was reversed L-shaped and of the eutrophic type, with the maximum chlorophtyll layer just below the surface. The vertical distribution of chlorophyll amounts as a measure of the productive structure almost always formed a stratum distribution except in September and sometimes in May, in Lake Changja. In September homogeneous distribution was observed.

夏季停滯期에 있어서 數個湖沼의 生態學的 比較硏究

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 富榮養化에 관하여

李鏡,嚴圭白,權寧命 한국식물학회 1975 Journal of Plant Biology Vol.18 No.3

The process of eutrophication was studied in the lake Changja from November in 1974 to May in 1975. The stratification of water temperature was going to be formed in April and the content of dissolved oxygen varied a little but it was almost zero from January. Total phosphorus was increased very rapidly in February but total nitrogen and carbohydrate-like substances were increased a little during the experimental period. The amount of chlorophyll-a varied from 127㎎/㎡ to 717㎎/㎡ with maximum value occuring in January. This phenomenon was an evidence that chlorphyll-a and total phosphorus were correlated each other. The numbers of colony of the coliform bacteria in point A was 10 times more than in point B. In conclcesions, the lake Changja is a very eutrophic and the ecological equilibrium of the lake can not be recovered as far as origin of pollution is erased out.