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다변량 통계분석을 이용한 북한강의 수질 및 식물플랑크톤 군집 특성 평가
김헌년 ( Hun Nyun Kim ),윤석제 ( Seok Jea Youn ),변명섭 ( Myeong Seop Byeon ),유순주 ( Soon Ju Yu ),임종권 ( Jong Kwon Im ) 한국물환경학회 2019 한국물환경학회지 Vol.35 No.1
The purpose of this study is to evaluate the water quality and phytoplankton community in Bukhan River which account for 44.4 % of the total inflow into Lake Paldang, using multivariate statistical techniques (i.e., correlation analysis, principal component analysis (PCA)/factor analysis (FA)). Water samples were collected from March to November 2015 and the following parameters measured; water temperature, pH, DO, EC, SS, BOD, Chl-a, COD, TN, NO<sub>3</sub>-N, NH<sub>3</sub>-N, TP, DTP, PO<sub>4</sub>-P, and phytoplankton community. The water quality of the main stream and the tributaries were not significantly different apart from the relatively high concentration of BOD, COD and nutrients recorded in MH. The highest cell density of Stephanodiscus hantzschii and Merismopedia glauca dominated phytoplankton was observed in PD. Based on the correlation analysis, total phytoplankton and cyanophyceae were highly correlated with BOD, COD and nutrients. PCA/FA resulted in four main factors accounting for 82.240 % of the total variance in the water quality dataset. The group of component 1 (TN, DTN, DO, NO<sub>3</sub>-N, water temperature) and component 2 (PO<sub>4</sub>-P, T-P, DTP, SS) were classified as nutrient element factor whereas component 3 (Chl-a, COD, BOD, NH<sub>3</sub>-N, pH) was related to organic substances. Hence, the identification of the main potential environmental pollution factors in Bukhan River will help policy makers make better and more informed decisions on how to improve the water quality.
강원도 홍천강의 조류군집과 생물학적 지수에 의한 수질 평가
백준수 ( Jun Soo Baek ),김헌년 ( Hun Nyun Kim ),이옥민 ( Ok Min Lee ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.6
This research has studied the physicochemical environmental factors and communities of epilithic diatom and phytoplanktons at Hongcheon river from December 2011 to September 2012. In case of TN, the result was hypertrophic, and for TP, it ranged from mesotrophic to eutrophic. As for BOD, Hongcheon river was rated level II or better, according to the water quality level; values were found to be below 3mg/L at most sites. Total of 83 and 114 taxa of epilithic diatom and phytoplanktons respectively, were found during the research. When assessed using the TSI, it ranged from oligomesotrophic to eutrophic. In case of DAIpo, it ranged from 64.1 to 99.5, and TDI ranged from 51.5 to74.0. These results signify good water quality, level B or better, for Hongcheon river. P-IBI was rated moderate to low, which showed higher pollution than other indices. Among the biological water quality measures analyzed in the Hongcheon river study, DAIpo best matches TDI and BOD, while TDI showed greater pollution. Therefore, P-IBI appears to be inappropriate when assessing the domestic small rivers and lakes.
환경요인에 따른 청평호 식물플랑크톤 군집 및 우점종의 천이 특성
윤석제 ( Seok Jea Youn ),김헌년 ( Hun Nyun Kim ),임종권 ( Jong Kwon Im ),김용진 ( Yong-jin Kim ),백준수 ( Jun-soo Baek ),이수웅 ( Su-woong Lee ),이은정 ( Eun Jeong Lee ),유순주 ( Soon Ju Yu ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.8
Phytoplankton populations were examined at three sites in Lake Cheongpyeong, South Korea from March 2008 to December 2016, including measurement of phytoplankton communities and their dominant species, abundance and environmental factors. The annual average ranges of water temperature, dissolved oxygen and conductivity were 15.2-18.8℃, 10.3-12.2 mg/L, 86-140 μS/cm, respectively, with similar values at all studied sites. The highest phytoplankton cell density was observed in spring and fall, and it subsequently decreased rapidly during heavy rainfall. Diatoms were dominant in spring (mainly Stephanodiscus hantzschii, Asterionella formosa) and fall (mainly Aulacoseira granulata), while greenalgae and cyanobacteria had high appearance in early-summer and summer, respectively, indicating that water temperature is the most important factor influencing their growth. Stephanodiscus hantzschii and Asterionella formosa frequently occurred at low water temperature (4.5-15.0℃ and 5.4-21.6℃, respectively) while Aulacoseira granulata and Anabaena spp. were favored by high water temperature (8.6-28.4 and 14.9-26.2℃, respectively) and phosphorus. Additionally, Fragilaria crotonensis occurred at low nutrient conditions. Rhodomonas spp. frequently appeared year-round.
퇴적층 배양에 따른 식물플랑크톤 군집 형성과 이취미물질 발생 특성
김용진 ( Yong Jin Kim ),윤석제 ( Seok Jea Youn ),김헌년 ( Hun Nyun Kim ),박응로 ( Eung Roh P가 ),황문영 ( Moon Young Hwang ),박진락 ( Jin Rak Park ),이병천 ( Byoung Cheun Lee ),이재관 ( Jae Kwan Lee ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.6
In this study, Uiam-sediment(US) and Gongji-sediment(GS) were incubated to analyze the formation of phytoplankton community and occurrences of odorous compounds from benthic cyanobacteria. For the phytoplankton, 45 and 40 taxa were found in GS and US, respectively. The phytoplankton species detected in the harmful algae included Microcystis, Anabaena and Oscillatoria. As a result, a standing crop of phytoplankton appeared to be in the range of 0.9∼71.8×103 cells/mL in GS, 0.8∼51.2×103 cells/mL in US, and as the incubation progressed, benthic cyanobacteria was increased. The highest number of akinetes was shown in the initial incubation, and akinetes was reduced by 10% on day 4 of incubation start. After reduction of akinetes incubated for 4 days in US and 15 days in GS, Anabaena appeared from the surface water. Benthic cyanobacteria such as Oscillatoria tenuis, O. limosa and Lyngbya hieronymusii was dominant in GS(max. 3.96×106 cells/cm2) and US(max. 5.77×106 cells/cm2), forming cyanobacterial mats in sediment surface. Cyanobacterial mats were suspended after 10∼12 days incubation in GS and US. Before and after the suspension of cyanobacterial mats, the concentration of geosmin was the highest in GS(115 ng/L) and US(175 ng/L). In the second suspension of cyanobacterial mats in GS, the concentration of 2-MIB was increased to the range of 22~92 ng/L.
김용진 ( Yong Jin Kim ),김헌년 ( Hun Nyun Kim ),이옥민 ( Ok Min Lee ) 한국환경영향평가학회 2012 환경영향평가 Vol.21 No.2
This research was to examine the physiochemical factors and the attached diatoms of ecological wetland in Paju from August 2010 to May 2011. As a result of physicohemical water quality assessment, the water temperature did not fluctuate much due to ample riparian vegetation and aquatic plants growing at the site. Due to the effect of Han River Estuary, site 4, 5 and 6 had high electricity conductivity. The BOD concentration was high at site 2, 3, and 4 caused by decrease in water quantity and inflow of polluted water. At all sites, T-N and T-P concentrations ranged from eutrophic to hypertrophic status. At the downstream, the T-N and T-P concentrations decreased by inhabiting aquatic plant. Total of 98 taxa of attached diatoms were found. As for dominant taxa, Achnanthes convergens, A. minutissima, Gomphonema gracile, G. parvulum, Melosira varians, Navicula seminulum, N. minima, N. pseudolanceolata, Nitzschia amphibia, N. palea, Surirella minuta and Synedra ulna var. fragilariodes appeared. The result of biological assessment of water quality rated the sites B(suboptimal)~D(poor) during seasons of low water temperature, Fall and Winter, with DAIpo ranging 24.1~68.2 and TDI of 48.4~85.6. During Spring and Summer, all sites were rated D(poor) with DAIpo lower than or equal to 40, and TDI above or equal to 70. The biological assessment of water quality at the research site showed inferior TDI result compared to that of DAIpo.
김용진 ( Yong-jin Kim ),백준수 ( Jun-soo Baek ),윤석제 ( Seok-jea Youn ),김헌년 ( Hun-nyun Kim ),이병천 ( Byoung-cheun Lee ),김귀다 ( Guee Da Kim ),박송은 ( Song Eun Park ),유경아 ( Kyung A You ),이재관 ( Jae-kwan Lee ) 한국물환경학회 2016 한국물환경학회지 Vol.32 No.3
We analyzed cyanobacterial community including akinete, resting cell, and benthic cyanobacteria in sediment of Bukhan, Namhan-River, Paldang-Lake, and Kyeongan-Stream and compared the physicochemical factors for water and pore water. We also performed cyanobacteria growth potential test through incubating sediment. As a result of physicochemical analysis, the concentrations of nutrients were similar for each depth of Bukhan-River. For Namhan-River and Lake Paldang sites, the concentrations of TP and DTN in bottom and deep water had higher levels. DTN in water body composed of NO3-N(73%) while DTN in pore water composed of NH3-N(77.8%). Benthic cyanobacteria in the sediment such as Oscillatoria tenuis, O. limosa, Phormidium tenue, Pseudanabaena limnetica, and Lyngbya sp. were dominant (between 0.0~243.3×103 cells/g, w/w). Cell densities of cyanobacteria in sediment depth of 0~2 cm in most sites were higher compared to those in other depths. The cell density of cyanobacteria in sediment correlated with pH, conductivity, BOD5, TP, DTP, and chl. a. Increased phytoplankton and organic matters were found to be able to inhibit the growth of benthic cyanobacteria. Results of cyanobacteria growth potential test after incubating sediment revealed that harmful cyanobacteria (Anabaena, Aphanizomenon, Microcystis, and Oscillatoria) appeared at 7 days post culturing. Base on these results, the methods used in this study are considered to be able to determine the appearance of harmful cyanobacteria.
북한강에서 출현한 Anabaena circinalis의 형태학적 특성 및 지오스민(geosmin) 발생 양상
윤석제 ( Youn Seok Jea ),김용진 ( Yong-jin Kim ),김헌년 ( Hun Nyun Kim ),김진용 ( Jin-yong Kim ),유미나 ( Mi-na Yu ),이은정 ( Eun Jeong Lee ),유순주 ( Soon Ju Yu ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.1
This study was carried out in the Bukhan River in the summer of 2014 and 2015, to identify the relationship between geosmin and the morphological changes in Anabaena. Identification of Anabaena was conducted using morphological and molecular analyses. Anabaena in this study was similar to Anabaena circinalis, A. crass, and A. spiroides with regard to regular coils, vegetative cell, akinete shape, and size, hoever, it was distinguishabl from A. crass and A. spiroides because of its larger trichome coil size. Additionally, the sequences of phycocyanin (PC) gene from Anabaena showed a 99% genetic similarity with A. circinalis NIES-1647 strain. The coil diameter of trichome ranged from 106 to 899 μm, and the diameter and abundance showed an insignificant positive correlation (r=0.544, p<0.05). The result of relationship between the coil diameter and the cell number per 360-degree rotation was kept at 33.8±5.2 cells per 100 μm diameter despite variable diameter. The average geosmin concentrations in 2014 and 2015 were investigated to be 99 ng/L and 35 ng/L, respectively. A. circinalis cell density contributed considerably to the change in geosmin and was positively correlated with geosmin concentration (2014; r=0.599, p<0.01, 2015; r=0.559, p<0.01). Our results suggest that geosmin and coil diameter could be estimated with the help of cell density.