Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Seasonal Variation of Water Quality and Cryptomonads Distribution in Oncheon River

온천천내 수질 및 Cryptomonads 분포의 시기별 변화

  • Jeong, Tae-Uk (Busan Metropolitan City Institute of Health & Environment) ;
  • Jeong, Sun-Young (Busan Metropolitan City Institute of Health & Environment) ;
  • Kim, Min-Jeong (Busan Metropolitan City Institute of Health & Environment) ;
  • Choi, Yoo-Jeong (Busan Metropolitan City Institute of Health & Environment) ;
  • Cho, Eun-Jeong (Busan Metropolitan City Institute of Health & Environment) ;
  • Jeong, Jae-Eun (Busan Metropolitan City Institute of Health & Environment) ;
  • Seo, Dong-Cheol (Department of Applied Life Chemistry & Institute of Agriculture and Life Science, Gyeongsang National University) ;
  • Park, Jong-Hwan (Department of Life Resources Industry, Dong-A University)
  • 정태욱 (부산광역시 보건환경연구원) ;
  • 정선영 (부산광역시 보건환경연구원) ;
  • 김민정 (부산광역시 보건환경연구원) ;
  • 최유정 (부산광역시 보건환경연구원) ;
  • 조은정 (부산광역시 보건환경연구원) ;
  • 정재은 (부산광역시 보건환경연구원) ;
  • 서동철 (경상국립대학교 환경생명화학과 & 농업생명과학연구원) ;
  • 박종환 (동아대학교 생명자원산업학과)
  • Received : 2022.08.09
  • Accepted : 2022.08.30
  • Published : 2022.09.30
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Abstract

BACKGROUND: Recently, the inflow of nonpoint pollutants into rivers caused by rapid urban and industrialization promotes the proliferation of algae, which causes eutrophication of rivers. This study was conducted to evaluate the seasonal variation of water quality characteristics and cryptomonads growth in the Oncheon River. METHODS AND RESULTS: The water quality and distribution characteristics of cryptomonads in the Oncheon River were investigated monthly for 12 months from January 2021. The cell number of cryptomonads was intensively developed in January-April, and it decreased sharply in the summer with heavy rainfall. In particular, cryptomonads moved to the downstream side of the river depending on the time, and as a result, significant differences were shown for each investigation point. The Korean trophic state index (TsiKO) in Oncheon River was classified as eutrophy all year round, indicating that cryptomonads can grow year-round. Distribution characteristics of cryptomonads in Oncheon River showed high correlations with DO (r=0.678), BOD (r=0.826) and chlorophyll-a (r=0.613) in water. CONCLUSION(S): In order to reduce cryptomonads in the Oncheon River, it is judged that a complex countermeasure considering the residence time, insolation and precipitation along with water quality factors is required.

Keywords

Acknowledgement

This work was supported by the international suitability infrastruction project of test and examination in environmental field funded by National Institute of Environmental Research.

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