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철원북방 DMZ 내의 중영양호 토교저수지의 생태학적 연구 5. 경안천 ( 팔당호 ) 과 토교저수지에서 식물플랑크톤의 크기별 현존량과 Chlorophyll α 의 계절 변동
한명수(Myung Soo Han),최영길(Yong Keel Choi),김세화(Se Wha Kim),이경(Kyung Lee),유광일(Kwang Il Yoo),이후랑(Hu Rang Lee),홍성수(Sung Su Hong),김영옥(Young Ok Kim) 한국환경생물학회 2002 환경생물 : 환경생물학회지 Vol.20 No.1
N/A With physico-chemical environmental factors such as temperature, DO, pH, conductivity and nutrients, size fractionated of phytoplankton standing crops and chlorophyll α concentrations(>8㎛, 3∼8㎛ and <3㎛) and their relationships were investigated at each station of Kyungan Stream and Togyo Reservoir from April to November in 1997. The two sampling sites showed different nutrient status: Kyungan Stream was eutrophic, while Togyo Reservoir was mesotrophic. Large sizes of phytoplankton and chl. α were higher in Kyungan Stream, opposite to those of Togyo Reservoir; Standing crops of phytoplankton(>8㎛) and chl. α(3∼8㎛) were high in Kyungan Stream, while phytoplankton(3∼8㎛) and chl. α(<3㎛) were abundant in Togyo Reservoir. These results imply that phytoplankton community in the highly eutrophicated water mainly comprised the large filamentous and/or colonial algae, such as Microcystis spp. and Aphanizomenon flos-aquae, which easily enriched by nutrients loading.
팔당호의 생태학적 연구 - 1. 수질의연변화 : 과거와 현재 -
한명수,유재근,유광일,공동수 ( Myung Soo Han,Jee keun Ryu,Kwang Il Yoo,Dong Soo Kong ) 한국하천호수학회 1993 생태와 환경 Vol.26 No.2
Annual variation of water quality in Pal`tang Reservoir in Korea is described. Water samples were collected monthly from surface layer at the one station of Pal`tang reservoir, Korea from March 1988 to May 1992. Dissolved oxygen, turbidity, conductivity, pH and chlorophyll-α concentration in water column was high compared with that of 1970`s. Recently, the frequency and intensity of phytoplankton blooms(over 15㎍ chlorophyll-α1^-1) appear to be increasing. Total nitogen concentration was high compared with that of 1970`s. But, it decreased gradually from 4.76mg/l to 0.51mg/l on January 1991 as it goes. Total phosphorus concentration in water column has increased more and more from 0.004mg/l to 0.074mg/l since 1988. Therefore, N/P ratio by atoms reduced from 500 to 10∼20 because of the increasing of phosphorus and decreasing of nitrogen. This result suggests that phosphorus limited phytoplankton growth in Pal`tang Reservoir. However, if N/P ratio reduced continuously like this pattern, dominat phytoplankton species might change due to nitrogen limitation from diatom assemblages to blue green algae.
철원 북방 DMZ 내의 중영양호 토교저수지의 생태학적 연구 - Ⅰ. 넷트로 제작된 mesocosm 에 대한 현장 시험 -
한명수,이경,유광일 ( Myung Soo Han,Kyung Lee,Kwang Il Yoo ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.4
Exploratory analysis of field derived data from in situ aquatic net-enclosure mesocosm and control stations, and the considerations for experimental design aquatic mesocosm were investigated in Togyo Reservoir at Chulwon, Korea. Physico-chemical parameters were measured and subsamples were collected weekly from surface layer of the each station from 5 November 1994 to 15 April 1995. Changing patterns for weekly fluctuation of phytoplankton biomass and relative dominant species within net enclosure(station N) were similar to the 2 control stations(Cl and C2), although nutrient concentrations had slightly different value at each stations during the study periods. Dominant species of phytoplankton changed dramatically from a Chlorococaloid(coccoid form) in autumn to dinoflagellate, Peridinium inconspicuum in spring at all stations. It has suggested that the field test for in situ aquatic net-enclosure mesocosmis successful for the ecological risk assessment. Trophic state of Togyo Reservoir according to its physicochemical parameters, phytoplankton biomass and species composition could be regarded as mesotrophic.
팔당호의 생태학적 연구 - 2. 식물플랑크톤의 군집 구조의 변화 -
한명수,어윤열,유재근,유광일,최영길 ( Myung Soo Han,Yun Yeol Auh,Jae Keun Ryu,Kwang Il Yoo,Yong Keel Choi ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.3
In order to examine the changes in phytoplankton community structure in Pal`tang river-reservoir system and to describe some of their interrelations, 4 stations were chosen. Observations were carried out for four times at the Pal`tang reservoir and the lower part of three rivers such as North Han river, South Han river and Kyung-An stream from April 1992 to May 1993 and these data were analyzed with other published data. A total of 60 taxa in phytoplankton: of these, 24 were Bacillariophyceae, 29 were Chlorophyceae, five were Dinophyceae, the other taxa as Chrysophyceae, Cryptophyceae were identified one species, respectively. Rapid eutrophication contribute to the shift of the chief components of the total phytoplankton community from Bacillariophyceae to Bacillariophyceae including Chlorophyceae. Among them, Autacoseira(=Melosira) granulata dominated continuously in this study area since 1980. Changes in Phytoplankton community structure in Station 4(Pal`tang reservoir) affected by the longitudinal transport along each river strech in Pal`tang river-reservoir system. However, Changes of phytoplankton community structure probably were affected by its growth characteristics during the stagnation period of water column. Station 3(Kyung-An Stream) is heavily eutrophicated due to stagnation of water column.
수계종속 영양세균 군집의 종조성 및 세포의 효소의 변화에 미치는 산성화의 영향
최영길(Yong Keel Choi),한명수(Myung Soo Han),김세화(Se Wha Kim),이경(Kyung Lee),유광일(Kwang Il Yoo) 한국환경생물학회 2002 환경생물 : 환경생물학회지 Vol.20 No.1
N/A In an artificial pH-gradient batch culture system, the author analyzed the effects of acidification on the species composition of heterotrophic bacteria. As the result of this study, it was found that the numbers of total bacteria were not affected by acidification and that the population size of heterotrophic bacteria decreased as pH became lower. THe heterotrophic bacteria isolated from all of the pH gradient were 12 genera and 22 species, and among them, gram negative and gram positive bacteria were 64% and 36%, respectively. As pH decreased, the distribution rate of gram negative bacteria increased while that of gram positive bacteria decreased. Regarding to distribution rate of genuses in each pH gradient, 13 genuses appeared at pH 7 while only 5 genuses appeared at pH 3, which means that the diversity of genera decrease as pH decreased. The activities of extracellular enzyme showed the ranges of 0.008∼0.292μMl^-1hr^-1 in bioreactor system. The enzymatic activities decreased rapidly below pH 5 and then sustained 5∼38% at the lower pH values.