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신재기(Jae Ki Shin),조경제(Kyung Je Cho) 한국환경영향평가학회 2001 환경영향평가 Vol.10 No.2
Water environment and freshwater algae were studied in the upstream of the Tamjin River Dam. Among the environmental factors, DO concentration in the Tamjin River ranged from 9.0 mg O₂/l to 9.2 mg O₂/l, pH from 7.0 to 7.1 and conductivity from 98 μS/cm to 100 μS/cm. Average concentration of NH₄ and NO₃ ranged from 40 μg N/l to 56 μg N/l and from 489 μg N/l to 611 μg N/l, respectively. NO₃ was more plentiful above 9∼15 fold than that of NH₄. Average concentrations of soluble reactive phosphorus and soluble reactive silicon were 2 μg P/l and 1.6 mg Si/l, respectively. Particulaly, Si nutrient increased by heavy rain events during summer season. The ratios of N/P and Si/P ranged from 248 to 261 and from 640 to 740, respectively. It is assumed that P would be limiting nutrient on the freshwater algal growth. Average content of planktonic chlorophyll-a ranged from 5 μg/l to 13 μg/l. Mean contents of chlorophyll-a, phaeo-pigment and ash-free dry matter of periphyton were 50.3 mg/m², 11.9 mg/m², 11.5 g/m² in the main stream and 30.1 mg/m², 5.6 mg/m², 7.8 g/m² in the tributary. By comparison of the epilithon biomass, the main stream was higher with 1.5∼2.1 fold than the tributary. The impotant algae were composed of diatom Achnanthes linearis, A. minutissima, Fragilaria crotonensis, Gomphonema gracile, Tabellaria flocculosa and blue-green algae Microcystis aeruginosa. In the relative abundance of the phytoplankton and epilithon, the serial dominance were diatom > green algae > blue-green algae, and diatoms were very abundant in comparison with other algal phylum.
신재기(Jae Ki Shin),조경제(Kyung Je Cho),오인혜(In Hye Oh) 한국환경생물학회 1999 환경생물 : 환경생물학회지 Vol.17 No.4
In order to elucidate characteristics of water quality, investigation of monthly dynamics of environmental factors and algal populations at major four stations of the mid and lower part in Taechong Reservoir was performed from June 1998 to June 1999. Water temperature, DO and pH were ranged 5.3∼27.7℃, 6.2∼13.8 ㎎ O_2/l and 6.4∼9.5, respectively. Those were varying as the season changes. Among inorganic nitrogen nutrients, NH_4 was ranged from 5.5% to 7.2% of NO_3 and NO_3 was almost same through the seasons except summer in which it was low. SRP and SRSi were increased in summer when the blue-green algae became dominant. Those were decreased as the cell density of diatom increased when the water temperature dropped. Therefore SRSi was considered to be another important nutrient factor contributing to the increment of biomass of freshwater algae as well as SRP. Average chl-α concentration ranged from 8 to 12 ㎍/l and in the lower part of the reservoir, the lowest was found. Moreover, there were remarkable increment in summer when TN/TP ratio were decreasing from relationships between TN/TP ratio and chl-α concentration. Annual mean ratio of TN/TP ratio was relatively high as the value was 110, which was relatively high, and it showed that P is the dominant factor in the algal growth. The dynamics of phytoplankton were simply dominated by a few species seasonally. In summer, blue-green algae such as Anabaena, Microcystis and Oscillatoria were dominant and algal bloom of blue-green began from early summer, sustained to late autumn. The average standing crops of A. spiroides v. crassa, M. aeruginosa and O. limosa were ranged 0.3∼2.0×10 exp (4) cells/ml 6.4×10 exp (2)∼1.0×10 exp (4) cells/ml and 4.6×10 exp (3)∼1.6×10 exp (4) cells/ml respectively. In winter, diatom Stephanodiscus was considered to be an important species whose average standing crops of Stephanodiscus was 4.9×10 exp (2) cells/ml from November to April of the next year and the highest was 1.3×10 exp (3) cells/ml in January. [Taechong Reservoir, Inorganic nutrient, Phytoplankton, Anabaena, Microcystis, Stephanodiscus].
진양호와 남강의 수질에 대한 Algal Growth Potential Test (AGPT) 적용
신재기 ( Jae Ki Shin ),이옥희 ( Ok Hee Lee ),조경제 ( Kyung Je Cho ) 한국하천호수학회 2003 생태와 환경 Vol.36 No.1
The algal growth potential test (AGPT) bioassay were conducted to assess the water quality and fertility in the Chinyang Reservoir and the lower part of the Nam River from August 2000 to July 2001. The AGPT value of the Chinyang Reservoir ranged from 0 to 23.4 mg dw l^-1, while 79% of the algae cultivation have not grown. The AGPT value was in proportion to phosphorus concentration of the water, and it was less when chlorophll-α was high. This value was higher in the middle and lower layers than in the upper layer, and in the inflow part where the water is shallower than in the lacustrine. The AGPT value has increased in the whole reservoir in August~September when the water volume is high. In contrast, the AGPT value in the Nam River varied greatly compared to that of reservoir, and ranged from 0 to 252.0 mg dw l^-1 and 65% of the algae cultivation have grown. The value was less than 10 mg dw l^-1 in the upstream, over the point where the treated wastewater discharged. It was 57 mg dw l^-1 on the average in the downstream, except in March and July when the discharged water influenced greatly, exceeding the hypertrophic condition. The result of AGPT shows the differences in the time and hypertrophic condition. The result of AGPT shows the differences in the time and space on the reservoir and the streams. The AGPT value has increased in July~September, and in December in the inflow part of the reservoir; in March and August~December in the lower part; and in January, May, and November in the streams. AGPT is useful not only in defining the influence of the limiting nutrients on the algal growth, but also in evaluating the nutrients fertility in the inland water.
신재기 ( Jae Ki Shin ),황순진 ( Soon Jin Hwang ),조경제 ( Kyung Je Cho ) 한국하천호수학회 2003 생태와 환경 Vol.36 No.1
The water quality of the Pyeongtaek Reservoir and its main streams has been evaluated for water pollution state in March, June, September and December, 2000. The following are the findings: NH_4 accounts for the majority of TN in the inflow streams. In the reservoir, TN and NH_4 are the more present in the winter season and less in the summer season, with 1.6~2.4 times of NO_3 and 5.3~11.4 times of NO_2 found in December and June compared with other seasons. The concentration of each component is different between streams; NH_4 among inorganic nitrogen has the highest concentration in the upstream, and NO_3 is more prevalent in the downstream. SRP accounts for 25~69% of TP in the stream. Unlike N component, P component in the reservoir rapidly decreases from upstream toward downstream, except in the summer. Average SRSi slightly increases in the fall, i.e., immediately after rainfall. In the streams, the average concentration of chlorophyll-a ranges from 9 to 33㎍/l, and is relatively high in the downstream. In contrast, in the reservoir, it is the highest in the upstream where NH_4 and SRP are frequently found. In particular, diatom and cryptomonad algae are bloomed in March, and blue-green algae in September; their maximum values are 108㎍/l and 130㎍/l, respectively. Considering the concentration of N and P nutrients, pollution loads can affect the Pyeongtaek Reservoir in the downstream in this order: Ansong Steam <Osan-Chiwi Stream<Songhwan Stream <Sojong Stream and Hwangguchi Stream. The water quality deterioration of the major streams in the watershed of the Pyeongtaek Reservoir due to the effluents of wastewater treatment plants and untreated domestic wastewater. The water pollution of the Pyeongtaek Reservoir is undergoing typical eutrophication, caused by excessive N and P nutrients from the upstream of the watershed. It is mainly felt in the winter and summer seasons.