영양염류, 투명도 및 엽록소를 이용한 인공호 영양상태, 경험적 모델 분석 및 변수들 간의 상호관계
Reservoir Trophic State and Empirical Model Analysis, Based on Nutrients, Transparency, and Chlorophyll-a Along with Their Relations Among the Parameters
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Abstract
The purpose of this study was to determine trophic state, based on nutrients (TN, TP), transparency (SD), and chlorophyll-a (Chl) and identify their empirical relations of TN-Chl, TPChl and Chl-SD depending on the dataset used along with dynamics of conductivity and suspended solids. Analysis of trophic states showed that more than half of 36 reservoirs were judged as eutrophic-hypertrophic conditions depending on the trophic variables. Seasonal values of TP varied by nearly 500% and showed greater in August than any other months. In contrast, TN varied within less than 90% and all monthly mean values of TN were never fall less than 1.2 mg L-1, indicating low seasonal variations and high ambient concentrations (eutrophic-hypertrophic state). Analysis of empirical relations in the trophic variables showed that transparency had greater functional relations with Chl (R2=0.31, p⁄0.001) than TP (R2=0.15, p⁄0.001) and TN (R2=0.20, p⁄0.001). Ratios of TN : TP in the ambient water indicated that most reservoirs showed a potential phosphorous limitation on the algal growth. Thus, algal biomass, based on Chl values, was more regulated by phosphorous than nitrogen. Analysis of linear regression model, based on log-transformed annual mean values, showed that only 30% in the variation of Chl was explained by TP (R2=0.295, p=0.001, n=36) and 15% by TN (R2=0.151, p=0.019, n=36). However, linear regression model, based on individual system, showed that Chl-TP model had strong positive relations (R2=0.62, p=0.002, n=12), whereas the model had no any relations (p=0.892, n =12). Overall, our data suggested that averaging effect in the empirical model developments may influence the significance in the statistical analysis.
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