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최승익,변명섭,안태석 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-
The total bacterial numbers were estimated by acridine orange direct count method in Lake Soyang monthly from January 1990 to 1992 The range of total bacterial number was from 0.4*10^(6) to 4.7*10^(6) cell*㎖^(-1). In epilimnion,the variation range was wider than other depths. while in hypolimnion was narrower. At August, when water temperature was highest. the bacterial numbers was also highest . This means that water temperature was highest the bacterial numbers was also highest. This means that water temperature was one of the factor governing the bacterial abundance. In metalimnion. the bacterial number was higher than other depths during stratigication. And spacially the bacterial numbers near aquaclture net-cages were higher than those of dam site. This means that allochthonous materials such as terrestorial originated particle, organics and microbes from watershed and fish feed stinmulated the bacterial growth.
최승익,안태석,김범철 한국미생물학회 1992 미생물학회지 Vol.30 No.2
소양호에서 인(P) 의 순환 과정중 유기인산염 분해율을 1990 1월 부터 1991녕 4 월 까지 측정한 결롸 1-2220 nM/l/hr 의 범위였다. 표층의 경우 8월에 가장 높았으며, 성층이 깨지는 10월과 11 월에는 8월보다 1/240배 이하로 낮은 값이였다. 우기인산염 분해율과 엽록소 a 와는 높은 상관 관계(R = 0.69) 를 나타내었고, specific activity는 겨울에 45-122 nM/hr/$\mu$g chl. a 으로조사기간중 최조값을, 10월에는 2 nM/hr/$\mu$g chl. a 로서 최저값을 나타내었다. 유기인산염 분해율과 DIP 농도와는 역상관의 관계이였다. 성층기에는 식물 플랑크톤이 증식하면서 유도된 alkaline phosphatase 에 의하여 유기인산염을 분해하고, 표, 심층부가 섞이는 가을에는 중, 심츤부로부터 충분한 양의 DIP 가 공급되는 것으로 나타나, 소양호의 부영양화 상태가 매우 심각함을 알 수 있었다. To elucidate a part of phosphorus cycle an'd the nutritional status of phosphorus. the degradation rates of organic phosphate by phosphatase activity (PA). were studied at the water column of Lake Soyang. from March 1900 to April 1991. Phosphatase activity showed the range of 1-2220 nMillhr. Its maximum value was recortled on August and minimum during October and November. The PA and chlorophyll u v~luess howed high correlation coefficent (0.69). and the values of specific astivity was highest during Winter, 45-12\ulcorner nMihripg chl. a, and lowest on October. 2 nMl hripg chl. 11. The values of PA and bioavailable dissolved inorganic phosphate (DIP) showed negative correlation in surface water. During destratification period (Oct. and Nov. 1990). the values of PA were about 11240 times lower than those during August albeit high concentration of chlorophyll a (1.7- 7.2 mglm'). Such results seem to be cause'd by DIP supply from the metalimnion. hypolimnion ant1 sediment. With these results. phosphate was sufficient to sustain the biomass in Autumn. and internal loading of phosphate shoultl accelerate the eutrophication in Lake Soyang.
소양호에서 섬유소 기질에 부착한 미생물의 유기물 분해 활성도
최승익,안태석 ( Seung Ik Choi,Tae Seok Ahn ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.1
In order to define the composition of dissolved organic materials(DOM) in the Lake Soyang, the cellobiohydrolase and, the β-glucosidase activity of attached bacteria on cellulose films submerged in various depths for 40-50 days were investigated. The numbers of the attached bacteria varied from 0.5×10^6 to 8.4×10^6 cells cm^-2, and the seasonal variation was more dramatic in epilimnion than in hypolimnion. The ranges of cellobiohydrolase and β-glucosidase activities were from 0.1 to 1396.5nM l^-1hr^-1 and from 0.2 to 2194.8nM l^-1hr^-1, respectively. Maximum activity of these two factors was recorded in winter. The specific activity of β-glucosidase was relatively higher during fall and winter compared to that of early spring. This results may indicate that the major component of DOM after the phytoplankton bloom is high molecular weight organic materials. But in early spring and summer, the DOM is low molecular weight organic materials.
최승익,김범철,안태석 ( Seung Ik Choi,Bomchul Kim,Tae Seok Ahn ) 한국하천호수학회 1997 생태와 환경 Vol.30 No.2
To scutinize the effects of acidification on bacterial community, bacterial numbers and β-glucosidase activities were analyzed within the acid-treated lake water. One liter of 0.2㎛ filtrated water of Lake Soyang were adjusted as pH 3.7, 5.0, 6.1 with 1N H-2SO_4 and inoculated to ml of Lake water. In case of pH 6.1, after incubating for 10 hrs, bacterial numbers and activities were similar to those of control. But in case pH 5.0, after incubating for 72 hrs, bacterial numbers and activities were higher than other cases. In low pH condition, pH 3.7, the bacterial community have not recovered their numbers and activities. Specific activity of β-glucosidase in pH 5.0 condition was the highest.
최승익,변명섭,안태석 ( Seung Ik Choi,Myeong Seop Byeon,Tae Seok Ahn ) 한국하천호수학회 1997 생태와 환경 Vol.30 No.4
The total bacterial numbers were estimated by acridine orange direct count method in Lake Soyang monthly from January, 1990 to December. 1992. The range of total bacterial number was from 0.4×10^6 to 4.7×10^6 cells ·ml^-1. In epilimnion, the variation range was wider than other depths, while in hypolimnion was narrower. At August, when water temperature was highest, the bacterial numbers was also highest. This means that water temperature was one of the factor governing the bacterial abundance. In metalimnion, the bacterial number was higher than other depths during stratification. And spacially, the bacterial numbers near aquaculture net-cages were higher than those of dam site. This means that allochthonous materials such as terrestorial originated particles, organics and microbes from watershed and fish feed stimulated the bacterial growth.
최승익,안태석,양상용,유홍일,유재근 ( Seung Ik Choi,Tae Seok Ahn,Sang Yong Yang,Hong Il Rhu,Jae Keun Ryu ) 한국하천호수학회 1994 생태와 환경 Vol.27 No.2
To define the effects of fish(Hypophihalmichthys molltrix) predation on phytoplankton densities and activities of extracellular enzymes including phosphatase, cellobiohydrolase and β-glucosidase were weekly investigated both in fish and control aquariums. Eventhough there was no increment of nutrients by fish predation, chl. a concentration in the fish aquarium was 12.6mg m^-3, twice higher than in the control, and total bacterial number(AODC) was 1.1x10^7cells ml^-1, 5 times higher than control aquarium after 25 days. The V_(max) and K_m values of extracellular enzyme activities were higher in the fish aquarium. Especially, the V_(max) of β-glucosidase in the fish aquarium was 7 times higher than in the control. These results suggest that the predation and digestion of Hypophihalmichthys molltrix should cause the diversification of substrates of extracellular enzymes and stimulate nutrient cycles and degradation of organic materials.