왕피천 유역의 저서성 대형무척추동물 군집분석 및 생물학적 수질평가 = Community Analysis and Bological Water Quality Evaluation of Benthic Macroinvertebrate in Wangpi-cheon Watershed

다국어 초록 (Multilingual Abstract)

The aim of this study is to perform community analysis and biological assessment of water quality using benthic macroinvertebrate from Wangpi-cheon watershed which is defined as conservation areas of ecosystem and landscape by ministry of environment in Korea. Field survey of the study area was carried out 2 times from June to September in 2012. As a result of the field survey, total 155 species of benthic macroinvertebrates in 74 families, 15 orders, 7 classes and 5 phyla were collected. The findings of community analysis using the classified species and individuals showed relatively low DI(Dominant Index) value of 0.22 and very high value of average H'(Diversity index) as 4.24. And the analyzed results of SI(Similarity Index) according to habitat types using functional feeding groups showed higher values of 94.51% and 93.19% respectively to tributary and main stream after the designation of conservation areas of ecosystem and landscape. These results infer that various species and lots of individual are widely distributed at Wangpi-cheon watershed and stream ecosystem of the study area is healthy and well maintained after the designation of conservation areas. And also, the calculated EPT value was 62.9% as high enough to explain the cleanness of Wangpi-cheon watershed. We evaluated environmental condition and biological water quality by using ESB(Ecological Score of Benthic macroinvertebrate community) and KSI(Korean Saprobic Index). The average evaluated ESB shows very high value of 208.2, therefore Wangpi-cheon watershed is designated as 'First priority protection waters' area and the value of KSI is 0.32 which meets the saprobic water quality standard as 'First class'.

국문 초록 (Abstract)

이 연구는 환경부 지정 생태․경관보전지역인 왕피천 유역의 저서성 대형무척추동물 군집분석 및 생물학적 수질평가를 실시하기 위한 것으로 2012년 6월에서 9월까지 총 2회에 걸쳐 현장조사를 수행하였다. 조사대상 지점은 왕피천 유역의 핵심 및 완충구역을 중심으로 상류에서 하류에 걸친 총 11개 지점(본류 5개 지점, 지류 6개 지점)에 해당된다. 조사결과 총 5문 7강 15목 74과 155종이 확인되었으며, 분류된 종과 개체수에 대한 군집분석 결과 우점도지수(DI)는 평균 0.22로 낮게 나타났으며, 평균 종다양도지수(H')는 4.24로 매우 높게 분석되었다. 그리고 조사된 섭식기능군을 이용하여 생태경관보전지역 지정 전과 후의 서식지 유형별 유사도를 분석한 결과, 생태경관보전지역 지정 이후에 지류 94.51%, 본류 93.19%의 높은 유사도 지수 값을 보였다. 이러한 결과로 왕피천 유역에 다양한 종과 많은 개체수가 서식하고 있으며, 생태경관보전지역 지정 이후에 하천생태계의 기능적인 면 역시 잘 유지되고 있음을 유추할 수 있었다. 또한 청정한 하천에서 높은 값을 보이는 EPT 지수값 역시 62.9%로 높게 분석되었다. 그리고 저서성 대형무척추동물 생태점수(ESB)와 한국오수생물지수(KSI)를 이용한 연구지역의 환경상태 및 생물학적 수질을 평가한 결과, 저서성 대형무척추동물 생태점수는 평균 208.2로 매우 높게 나타나 ‘최우선보호수역’으로 판정되었으며, 한국오수생물지수는 평균 0.32로 생물학적 수질등급 ‘Ⅰ등급’으로 평가되었다.

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