Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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The Distribution of POC and DOC in Four Reservoirs on the North Han River and the Relationship with Algal Density

북한강수계 호수의 POC와 DOC 분포와 조류밀도의 관계

  • Kim, Kiyong (Department of Environmental Science, Kangwon National University) ;
  • Kim, Bomchul (Department of Environmental Science, Kangwon National University) ;
  • Eom, Jaesung (Department of Environmental Science, Kangwon National University) ;
  • Choi, Youngsoon (Department of Environmental Science, Kangwon National University) ;
  • Jang, Changwon (Department of Environmental Science, Kangwon National University) ;
  • Park, Hae-kyung (National Institute of Environmental Research)
  • 김기용 (강원대학교 자연과학대학 환경학과) ;
  • 김범철 (강원대학교 자연과학대학 환경학과) ;
  • 엄재성 (강원대학교 자연과학대학 환경학과) ;
  • 최영순 (강원대학교 자연과학대학 환경학과) ;
  • 장창원 (강원대학교 자연과학대학 환경학과) ;
  • 박혜경 (국립환경과학원)
  • Received : 2009.03.26
  • Accepted : 2009.09.17
  • Published : 2009.11.30
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Abstract

Spatial and temporal distributions of POC and DOC were surveyed in the North Han River system, Korea The proportion of algal cells was calculated in four reservoirs (Lakes Soyang, Paro, Chunchon, and Uiam). Monthly average DOC concentrations ranged from 1.5 to 2.3 mg C/L, and POC showed larger variation than DOC (range 0.3 to 1.9 mg C/L). The average proportion of POC in TOC was higher than those of typical natural lakes. Due to the influence of the Asian summer monsoon, the seasonal variation in POC concentration depended on heavy rain events occurring during the summer. POC concentrations increased during the summer monsoon season due to turbid storm runoff laden with debris, while DOC concentrations did not increase. The highest POC concentrations were observed in Lake Soyang in 2006 when a severe rain event occurred. In two deep stratified reservoirs (Lake Soyang and Paro) storm runoffs formed an intermediate turbidity layer with high POC and chlorophyll concentrations which is thought to originate from terrestrial debris and periphyton transported by inflowing streams. The proportion of algal cells in total POC was much lower than for most natural lakes, and it varied with season; low in the monsoon season and high in dry seasons with algal blooms. An analysis of POC concentration and chlorophyll a concentration showed that the ratio of POC/Chl.a varied from 24 to 80.

Keywords

References

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