Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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The Effect Factors on the Growth of Phytoplankton and the Sources of Organic Matters in Downstream of South-Han River

남한강 하류수역에서 식물플랑크톤 증식의 영향인자 및 수중유기를 기원

  • Park, Hae-Kyung (Han river Environmental Research Center, National Institute of Environment Research) ;
  • Byeon, Myeong-Seop (Department of Water Environment, National Institute of Environment Research) ;
  • Choi, Myeong-Jae (Han river Environmental Research Center, National Institute of Environment Research) ;
  • Kim, Young-Jin (Han river Environmental Research Center, National Institute of Environment Research)
  • 박혜경 (국립환경과학원 한강물환경연구소) ;
  • 변명섭 (국립환경과학원 수질환경과) ;
  • 최명재 (국립환경과학원 한강물환경연구소) ;
  • 김용진 (국립환경과학원 한강물환경연구소)
  • Received : 2008.06.04
  • Accepted : 2008.08.01
  • Published : 2008.09.30
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Abstract

We divided the downstream of South-Han River into three water zones, such as river zone, transition zone and lacustrine zone depending on the flow rate, and elucidated the major effect factors on the growth of phytoplankton and the sources of organic matters in each water zone. The difference of chlorophyll-a concentration which represents the standing crop of phytoplankton was statistically significant among the water zones. From the results of bivariate correlation analysis between chlorophyll-a concentration and water quality parameters in each water zone, the outflow of Chungju dam and hydraulic retention time of Lake Paldang which are directly related with the flow rate seemed to have obvious impact on phytoplankton growth in the downstream of South-Han River. The concentration of nutrients such as phosphorus and nitrogen exceeded the criterion of eutrophication and did not showed significant relationship with chlorophyll-a concentration. There were strong correlations between $BOD_5$ and chlorophyll-a concentrations in transition and lacustrine zone showing autochthonous production of phytoplankton was dominant source of organic matters in these zones especially in dry seasons. The results of this study show that the control of abundance of phytoplankton is the key target for reduction of the organic pollution in the downstream of South-Han River.

Keywords

Acknowledgement

Grant : 남한강 중.하류 하천 및 팔당호의 생태계 구조 조사

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