생태와환경 (Korean Journal of Ecology and Environment)

  • 제43권2호
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  • Pages.232-241
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  • 2010
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  • 2288-1115(pISSN)
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  • 2288-1123(eISSN)
한국수생태학회 (The Korean Society of Limnology)
권호 표지

도시 하천(원주천) 유입이 섬강 하류 부착규조 군집에 미치는 영향

Effects of an Inflowing Urban Stream (Wonju stream) on Epilithic Diatom Assemblages in the Lower Seom River

  • Yoon, Sung-Ae (Department of Environmental Science, Konkuk University) ;
  • Kim, Nan-Young (Department of Environmental Science, Konkuk University) ;
  • Kim, Baik-Ho (Department of Environmental Science, Konkuk University) ;
  • Hwang, Soon-Jin (Department of Environmental Science, Konkuk University)
  • 투고 : 2010.05.18
  • 심사 : 2010.06.10
  • 발행 : 2010.06.30
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초록

섬강 수계로 유입되는 도시하천(원주천)의 유입이 부착조류 군집에 미치는 생태학적 영향을 평가하기 위하여 부착조류 및 수질조사를 실시하였다. 조사는 섬강 본류와 원주천을 포함한 지류 등 총 14개 지점을 선정하여 2007년 10월에서 2008년 9월에까지 계절별로 4회에 걸쳐 실시하였다. 조사결과, 수온과 용존산소를 제외한 대부분의 수질항목은 계절 변이가 크지 않았고, 섬강 상류에서 가장 낮은 농도를 보였으며, 섬강 중류(원주천 유입부분)에서 가장 높은 농도를 보였고, 원주천 합류 이후 하류로 갈수록 점차 농도가 감소하였다. 조사기간 동안 가장 높은 빈도와 생물량을 보인 종은 Achnanthes convergens이었고, 원주천를 비롯하여 수질오염이 심한 지점에서는 Navicula goeppertiana, Navicula subminuscula, Nitzschia palea 등이 높은 밀도를 보였다. 각 조사지점의 TDI(trophic diatom index)에 의하면, 섬강 수계는 크게 3 그룹 - 섬강 상류와 지류하천(A 또는 B등급), 원주천(D등급), 합류후 섬강하류의 본류(C등급)로 구분되었으며, 대부분의 수질과 높은 상관성을 보였다. 생물 및 수질요인을 근거로 하는 유사도 분석결과는 TDI 지수의 분포와 유사하였다. 따라서, 인구밀집과 공업단지를 관통하는 원주천은 섬강 수계에 서식하는 부착규조 및 수질에 큰 영향을 미치며, 원주천 합류 이후 하류로 갈수록 오염정도가 점차 감소하는 것으로 평가되었다.

Epilithic diatom communities and water quality were monitored to evaluate the ecological impact of the inflow of Wonju-stream passing through the urban area in the Seom River Watershed. We selected the 14 sampling stations (5 main stream sites and 9 tributary sites), and collected diatom and water samples between October 2007 and September 2008, on the seasonal basis. The results indicate that most water quality parameters showed the site-specific patterns over the study, except for water temperature and dissolved oxygen. The levels of water quality parameters were highest at the site of Wonju stream, whereas the lowest in the upstream sites, and intermediate or gradually decreased in the downstream sites of the Seom river. One species, Achnanthes convergens, showed the highest biomass and frequency over the sites, while three saprophilous species-Navicula goeppertiana, Navicula subminuscula, Nitzschia palea were appeared only in Wonju Stream and other polluted sites. According to trophic diatom index (TDI) values, which were highly correlated with nutrients and EC, the study sites were classified into three classes: upstream and tributary (Class A and B), Wonju Stream (Class D), and mixed zone and downstream (Class C). A cluster analysis supported the result of TDI classification. Therefore, Wonju-stream located in populated urban area exerted the adverse ecological effects on the epilithic diatom community and water quality of the lower Seom River System, although its severity gradually decreased downstream.

키워드

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