생태와환경 (Korean Journal of Ecology and Environment)

  • 제40권3호
  • /
  • Pages.468-480
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  • 2007
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  • 2288-1115(pISSN)
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  • 2288-1123(eISSN)
한국수생태학회 (The Korean Society of Limnology)
권호 표지

도시화 정도에 따른 포천천과 영평천의 돌 부착규조 군집 변화

Changes of Epilithic Diatom Communities according to Urbanization Influence in the Pocheon and Youngpyeong Streams

  • 김용재 (대진대학교 생명과학과)
  • 발행 : 2007.09.30
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초록

도시화는 하천의 수리, 수질 및 수로의 형태를 변화시키고, 수생태계의 조성을 변화시키고 있다. 최근 포천천과 영평천 주변에 많은 인구와 소규모의 공장 등이 유입되어 도시화됨으로써 오, 폐수의 방류량이 증가하였다. 본 연구는 도시화의 정도에 따라 하천 생태계를 구성하고 있는 돌 부착규조 군집의 조성이 다른 것에 기초로 하여 돌 부착규조 군집의 조성, 우점종 및 생태군 별 종 조성과 생물지수(DAIpo)에 의한 수 환경을 평가하였다. 두 하천의 도시화 지수는 포천천의 정점 P-3와 P-5에서 각각 85와 91로 매우 높은 반면에 영평천 주변의 도시화지수는 약 20 이하였다. 본 조사에서 돌 부착규조는 총 141종류로써 2목, 8과, 30속, 128종, 12변종, 1미동정종으로 구성되었다. 출현 종수는 포천천에서$11{\sim}36$종류의 범위였고, 영평천에서 $14{\sim}45$종류의 범위였다. 우점종은 포천천에서 Navicular saprophila, N. subminuscula, Nitzschia palea, Gomphonema pseudoaugur 등이었으며, 영평천에서 Achnanthes alteragracillima, A. convergens, A. minutissima, N. minima, N. fonticola, N. frustulum와 Cymbella minuta var. silesiaca 등으로써 두 하천의 도시화 정도에 따라 뚜렷한 차이를 나타내었다. 도시화 지수와 EC, BOC, COD, TN, TP. 및 DAIpo 등은 높은 상관관계 $(r^2>0.8)$를 나타내었다. 도시화에 따라 유기오염의 정도가 매우 다르며, 이에 따라 돌 부착 규조의 생태군이 포천천에서는 호오탁성종의 종수 및 상대빈도가 매우 높은 반면 영평천에서는 호청수종의 종수 및 상대빈도가 높았다. 생물지수(DAIpo)에 의한 두 하천의 수질은 포천천에서 조사 동안 강부수성(P-3, 4, 5)을 나타내었고, 영평천에서는 빈부수성(Y-1)에서 강부수성(Y-4)까지 다양하게 나타났다.

The urbanization is altering the hydrology, water quality, channel form of waterway and changing the composition of biological communities in the aquatic ecosystem. Recently, towns grew bigger by the drift of large numbers of people and the medium and small leather and dyeing industries around the Pocheon and Youngpyeong streams. The discharges of sewage were increased by them. The UII (urban intensity index) was 85 (st. P-3) and 91 (st. P-6) in the Pocheon stream and about 20 in the Youngpyeong stream. A total 141 taxa of epilithic diatoms which were composed of 2 order, 8 family, 30 genera. Dominant species were Navicula saprophila, N. subminuscula, Nitzschia palea, Gomphonema pseudoaugur in the Pocheon stream and Achnanthes alteragracillima, A. convergens, A. minutissima, N. minima, N. fonticola, N. frustulum and Cymbella minuta var. silesiaca in the Youngpyeong stream. It Showed the different composition of dominant species by the urbanization near two streams. In the relationships between UII and environmental factors such as EC, BOD, COD, TN, TP and DAIpo, UII showed the high relations $(r^2>0.8)$. It was the difference of organic pollution according to urbanization. It therefore, was higher the relative abundance and more the numbers of saprophilous taxa in the Pocheon stream than the Youngpyeong stream. The water quality of two streams by biological indicators(DAIpo) was polysaprobic state(st. P-3, P-4, P-5) in the Pocheon stream and was oligosaprobic (Y-1), mesosaprobic (Y-2, 3) and polysaprobic state (Y-4) in the Youngpyeong stream during the investigation periods.

키워드

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