Environmental Studies in the Lower Part of the Han River IIX. Assessment for Water Quality Using Epilithic Diatom Assemblage Index to Organic Water Pollution (DAIpo) in Dry Season

한강하류의 환경학적 연구 IIX. 갈수기 부착돌말류의 유기오탁지수 (DAIpo index)에 의한 수질 평가

  • 정승원 (한양대학교 자연과학대학 생명과학과) ;
  • 박성환 (상명대학교 자연과학대학 생명과학과) ;
  • 이진환 (상명대학교 자연과학대학 생명과학과)
  • Published : 2008.08.31

Abstract

In order to access the water quality using epilithic diatom assemblage index to organic water pollution (DAIpo) in the lower part of the Han River, the diatom samples were collected biweekly at 2 stations by means of artificial substrates of ceramic tiles from February, 2004 to February, 2005. A total of 60 taxa, representing 18 genera 51 species, 7 varieties and 2 forms, of diatoms were identified in the present study. Dominant percentages of Aulacoseria granulata and Melosira varians (Indifferent taxa) were 22.76$\sim$30.30% and 17.44$\sim$34.78%, respectively, and Nitzschia palea (Saprophilous taxa) were 15.00$\sim$31.76% at St. 1. In St. 2, the percentages of dominant species, N. palea, were 19.86$\sim$58.20%. Average DAIpo index was 40.6 in St. 1 and 32.1 in St. 2, and the saprobic level was shown $\beta$-mesosaprobic in the lower part of the Han River. It is suggested that epilithic diatoms as bioindicators and a DAIpo index indicate useful for analy-zing assessment of the water quality.

본 연구는 한강하류역에서 2개 정점을 선정하여 2004년 2월부터 2005년 2월까지 갈수기에 격주 간격으로 인공기질을 이용하여 부착돌말류에 의한 수질평가를 수행하였다. 조사기간 중 출현한 부착돌말류는 총 60분류군으로 2목 3아목 8과 18속 51종 7변종 2품종으로 구성되어 있었다. 정점별 우점종은 정점 1에서 광적응성 종인 A. granulata (22.76$\sim$30.30%), M. varians (17.44$\sim$34.78%)와 호오염성 종인 N. palea (15.00$\sim$31.76%)등이 출현하였으며, 정점 2에서는 호오염성 종인 N. palea (19.86$\sim$58.20%)가 주요 우점종이 었다. DAIpo지수는 정점 1에서는 평균 40.6을, 정점 2에서는 평균 32.1로 각각 $\beta$-중부수성 수역이었으나, 정점 2에서 수질이 더 악화되어 있었다. 본 연구에서 출현한 우점종들이 한강하류역에서 수질 판정할 수 있는 주요 지표종이며, 이들의 상대빈도에 의한 DAIpo지수는 수질평가의 유용한 수단이 될 수 있었다.

Keywords

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