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남한강 지류인 복하천과 달천의 부착규조를 이용한 생물학적 수질평가

Water Quality Assessed by DAIpo and TDI of Bokha Stream and Dal Stream in South-Han River

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Abstract

The research was to get a biological assessment on Bokha stream and Dal stream, using the physicochemical factors and the epilithic diatom from June, 2008 to March, 2009. As a result, Bokha stream showed high consistency of total phosphorus (0.041~0.886 mg∙L-1), and total nitrogen (0.336~10.532 mg∙L-1). Also, the concentration of BOD showed most of the sites polluted as 2~5 mg∙L-1 except for the upstream sites. However, excluding downstream sites and other few sites, Dal stream had very clean water quality having total phosphorus less than 0.06 mg∙L-1, and total nitrogen less than 2.0 mg∙L-1. Out of the 12 total sites, 98 taxa of epilithic diatoms appeared: 67 taxa from Bokha stream, and 78 taxa from Dal stream. The results of the water quality assessment showed that, Bokha stream, having TDI level over 80, was mostly α-mesosaprobic, which indicates a severe pollution. On the other hand, Dal stream, having TDI level below 50, was examined to be xenosaprobic and α-oligosaprobic, which indicates a clean water quality. The correlation between DAIpo and TDI measured to be high in correlation coefficent (0.83) from the result of correlation analysis. When the water quality is good, there is an inclination of getting high correlation between chemical and biological water quality assessment results. TDI, which uses numerous taxa of diatoms, showed more stability than DAIpo, which uses less amount of taxa of diatoms to get its result.

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