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The Epilithic Diatom Community and Biological Water Quality Assessment of Naeseongcheon Located at the Upper Region of Nakdong River

낙동강 상류 수계인 내성천의 부착돌말 군집과 부착돌말지수를 이용한 생물학적 수질평가

  • Choi, Jae sin (Department of Biology, Kyungpook National University) ;
  • Lee, Jae hak (Department of Biology, Kyungpook National University) ;
  • Kim, Han-Soon (Department of Biology, Kyungpook National University)
  • Received : 2017.09.09
  • Accepted : 2017.12.14
  • Published : 2017.12.31

Abstract

The aims of this study were to analyze the physico-chemical factors and the characteristics of epilithic diatom community from 15 sites of the Naeseongcheon and tributaries located in the upper region of the Nakdong river from May to October 2016. The biological water quality was assessed using DAIpo and TDI. A total of 163 diatom taxa were identified with 2 orders, 3 suborders, 9 families, 35 genera, 145 species, 16 varieties and 2 forms. Cocconeis placentula var. lineata appeared at every examined sites. Achnanthes lanceolata, Nitzschia fonticola, Nitzschia inconspicua and Reimeria sinuata were common taxa of the Naeseongcheon. Nitzschia inconspicua and Achnanthes minutissima were major dominant species. As a result of the CCA, Electrical conductivity and total nitrogen concentration were important factors determining the diatom species composition. In the result of the biological assessment using DAIpo, the Naeseongcheon was rated at class B with an average of 62.38. In the result of assessment using TDI, the Naeseongcheon was rated at class C with an average of 66.12.

본 연구는 낙동강 상류에 위치한 내성천과 지류들을 대상으로 총 15개의 지점에서 2016년 5월, 8월 및 10월의 총 3회에 걸쳐 이화학적 환경요인들과 부착돌말 군집의 특성을 분석하고, 생물학적 방법인 DAIpo와 TDI를 이용하여 수질을 평가하였다. 내성천 수계에서 출현한 부착돌말류는 2목 3아목 9과 35속 145종 16변종 2품종으로 구성된 총 163종이 출현하였다. Cocconeis placentula var. lineata는 모든 지점에서 출현하였으며, Achnanthes lanceolata, Nitzschia fonticola, Nitzschia inconspicua와 Reimeria sinuate는 내성천의 보편적인 분류군들로 조사되었다. Nitzschia inconspicua와 Achnanthes minutissima가 주요 우점종으로 출현하였다. CCA 분석 결과, 부착돌말 종조성은 전기전도도와 총질소에 가장 많이 영향을 받는 것으로 나타났다. DAIpo를 이용한 생물학적 수질평가 결과, 내성천의 DAIpo는 평균 62.38로 B등급이나, TDI로 평가한 결과, 내성천의 TDI는 평균 66.12로 C등급으로 나타났다.

Keywords

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