Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Variances of Environmental Factors during Water Bloom by Microcystis aeruginosa (K$\ddot{u}$tzing) K$\ddot{u}$tzing in Ilwol Reservoir, Suwon

수원 일월저수지에서 Microcystis aeruginosa (K$\ddot{u}$tzing) K$\ddot{u}$tzing 수화현상 시 환경요인들의 변화

  • Kim, Ji-Eun (Division of Chemical & Biological Enginering, Seokyeong University) ;
  • Park, Jung-Won (National Park Research Institute, Oil Pollution Research Center) ;
  • Jo, Ki-An (Department of Environment Health, Chodang University) ;
  • Kim, Si-Kyoon (Division of Chemical & Biological Enginering, Seokyeong University)
  • 김지은 (서경대학교 화학생명공학과) ;
  • 박정원 (국립공원연구원 유류오염연구센터) ;
  • 조기안 (초당대학교 환경보건학과) ;
  • 김시균 (서경대학교 화학생명공학과)
  • Received : 2013.05.10
  • Accepted : 2013.06.10
  • Published : 2013.06.30
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Abstract

Variances in environmental factors were followed in Ilwol reservoir, Suwon, during bloom of Microcystis aeruginosa (K$\ddot{u}$tzing) K$\ddot{u}$tzing, Cyanophtya from August to October, 2011. M. aeruginosa dominated the water column throughout the investigation period. The water temperature varied from $25.7^{\circ}C$ to $28.4^{\circ}C$, pH 8.40 to 11.17, CODcr 4.25 to $72.00mg\;L^{-1}$, electrical conductivity 333.1 to $749.0{\mu}g\;cm^{-1}$, and Chl-a 22 to $185mg\;L^{-1}$. In particular, the high levels of CODcr is likely indicate high contribution of autochthonous organic matters in the reservoir. TN varied from 28.86 to $56.75mg\;L^{-1}$, TP 0.20 to $1.24mg\;L^{-1}$, Fe 0.11 to $1.05mg\;L^{-1}$, and Si 3.13 to $7.46mg\;L^{-1}$. These increases imply constant accumulation in Ilwol reservior, and reinforce the idea of autochthonous organic matters input in the reservoir. The Korea Trophic Status Index ($TSI_KO$) varied from 37.19 to 147.22. Trophic levels varied from mesotrophic to hypertrophic level, and differed spatio-temporally. Therefore, it is concluded that $TSI_KO$ is useful for analyzing trophic status of reservoirs.

본 연구는 수원 일월저수지에서 수화현상 시 환경요인들의 변화와 한국형 부영양화 지수를 이용하여 영양단계를 평가하였다. 수화현상 종은 남조류의 Microcystis aeruginosa Kutz.였으며 조사기간 내내 우점하였다. 수온은 평균 $25.7{\sim}28.4^{\circ}C$, pH는 8.4~11.17, CODcr는 4.25~$72.0mg\;L^{-1}$, 전기전도도는 333.1~$749.0{\mu}S\;cm^{-1}$, Chl-a는 22.0~$185.0mg\;L^{-1}$였다. 정체 수역인 정점 2에서 CODcr는 다른 정점에 비해 2.9배 정도로 높아 내부기원 유기물의 기여도가 높은 것으로 판단된다. 영양염인 TN은 평균 28.86~$56.75mg\;L^{-1}$, TP는 0.2~$1.24mg\;L^{-1}$로 매우 높았고, Fe는 0.11~$1.05mg\;L^{-1}$이었고, Si는 3.13~$7.46mg\;L^{-1}$이었다. TN과 TP는 일월저수지 내에 지속적으로 누적된 것으로 파악되었고, Fe도 높은 농도가 유지되었다. 한국형 부영양화지수는 37.19~147.22였다. 영양단계는 중영양에서 과영양 단계로 평가되었고, 같은 저수지 내에서도 시기 및 지점에 따라 영양단계가 다름을 나타내므로 많은 자료가 추적된다면 한국형 영양단계 분석은 저수지의 영양단계 분석 시 매우 유용하게 활용될 것으로 판단된다.

Keywords

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