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Trophic States of 36 Korean Reservoirs and Empirical

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Trophic States of 36 Korean Reservoirs and Empirical Trophic States of 36 Korean Reservoirs and Empirical Model Analysis P096 Sang-Jae Lee, Dae-Yeul Bae, Jae-Kyung Kim, Kwang-Guk An (School of Bioscience and Biotechnology, Chungnam National University, Daejeon, 305-764, Korea) INTRODUCTIONS Also, Dalbang reservoir was selected in the Gangwon province. In the Gyeongsang province, According to necessity increase of water resource Namgang, Hapcheon, Unmun, Hoeya, Sayeon, security since 1990s, various research approaches Angye, Bomun, Yeongcheon, Andong, Gachang, for the eutrophication of artificial reservoirs was Imha, Kucheon, Yeoncho, Junam reservoirs were widely active. analyzed. Since the point of report in UNESCO about All survey sites were included broad range from eutrophication control in natural and artificial small agricultural reservoirs to large sized reservoirs (Ryding & Rast, 1989), it has been multipurpose dam. The range of watershed area was revealed the structural and functional differences from 6.7 to 3,204km2 and average depth covered between natural and artificial reservoir (Wetzel from 0.6 to 26.9m. 1990) and eutrophication mechanism examination in the waterbody (Lee et al. 2000). Also, evaluation RESULTS AND DISCUSSIONS method development (Choi et al. 2006; Carlson 1976) and management techniques (Yoon et al. The purpose of this study was to determine trophic 2000; Lee et al. 2008; Heo et al. 2006) in reservoirs state, based on nutrients (TN, TP), transparency and watershed management (Ticehursta et al. 2008) (SD), and chlorophyll-a (Chl) and identify their was broadly studied. empirical relations of TN-Chl, TP-Chl and Chl-SD In Korea, chlorophyll concentration increase by depending on the dataset used along with dynamics input of nutrient (especially TN, TP) and increase of of conductivity and suspended solids. Analysis of algal bloom frequency (Kim et al. 2003; Park et al. trophic states showed that more than half of 36 2005b) have been reported about chlorophyll reservoirs were judged as eutrophic-hypertrophic concentration increase by input of nutrient conditions depending on the trophic variables. (especially TN, TP) and increase of algal bloom Seasonal values of TP varied by nearly 500% and frequency (Kim et al. 2003; Park et al. 2005) in showed greater in August than any other months. In multipurpose artificial dam and reservoirs which is contrast, TN varied within less than 90% and all used for the agricultural watersupply. In association monthly mean values of TN were never fall less than with these multiple reasons, eutrophication has been 1.2mgL-1, indicating low seasonal variations and worse by decrease of oxygen concentration (Park et high ambient concentrations (eutrophic-hypertrophic al. 2008) and reduction of light penetrability in state). waterbody. Analysis of empirical relations in the trophic variables showed that transparency had greater MATERIAL AND METHODS functional relations with Chl (R2 = 0.31, p < 0.001) than TP (R2 = 0.15, p < 0.001) and TN (R2 = 0.20, Analyzed dataset in this research was monthly data p < 0.001). Ratios of TN:TP in the ambient water within the year during January to December 1999 indicated that most reservoirs showed a potential and gathered from Ministry of Environment and phosphorous limitation on the algal growth. Thus, Ministry of Agriculture in Korea. Thirty six algal biomass, based on Chl values, was more reservoirs distributed in whole country were studied regulated by phosphorous than nitrogen. Total number of reservoir surveyed. Detail sites are Analysis of linear regression model, based on as following. log-transformed annual mean values, showed that Kwangkyo, Idong, Kosam and Woncheon only 30% in the variation of Chl was explained by reservoirs were analyzed in the Gyeonggi province. TP (R2 = 0.295, p = 0.001, n = 36) and 15% by TN Yedang, Kyeongcheon, Daecheong, Tapjung, and (R2 = 0.151, p = 0.019, n = 36). However, linear Boryeong reservoirs were analyzed in the regression model, based on individual system, Chungcheong province. In the Jeonra province, showed that Chl-TP model had strong positive Damyang, Jangsung, Buan, Kwangju, Naju, relations (R2 = 0.62, p = 0.002, n = 12), whereas the Dongbok, Seomjingang, Bosung, Juam, Daea, Sueo, model had no any relations (p = 0.892, n = 12). and Juam regulating pondage reservoirs were Overall, our data suggested that averaging effect in analyzed. the empirical model developments may influence the significance in the statistical analysis. .
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