Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Effects of Sediment Removal on Water Quality, Phytoplankton Communities and Benthic Macroinvertebrate

퇴적물 제거가 수질과 식물플랑크톤, 저서성 대형무척추동물에 미치는 영향

  • Youn, Seok Jea (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Hun Nyun (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Yong Jin (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Lee, Eun Jeong (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Byeon, Myeong-Seop (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Lee, Byoung-cheun (Environmental Health Research Department, National Institute of Environmental Research) ;
  • Lee, Jae-Kwan (Water Environment Research Department, National Institute of Environmental Research)
  • 윤석제 (국립환경과학원 한강물환경연구소) ;
  • 김헌년 (국립환경과학원 한강물환경연구소) ;
  • 김용진 (국립환경과학원 한강물환경연구소) ;
  • 이은정 (국립환경과학원 한강물환경연구소) ;
  • 변명섭 (국립환경과학원 한강물환경연구소) ;
  • 이병천 (국립환경과학원 환경건강연구부) ;
  • 이재관 (국립환경과학원 물환경연구부)
  • Received : 2018.04.02
  • Accepted : 2018.05.24
  • Published : 2018.05.30
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Abstract

This study investigated the effects of sediment removal on water quality and phytoplankton development by setting up mesocosms at Uiam Lake, South Korea, and analyzing the environmental parameters and phytoplankton communities between June and October 2015. The comparison between testbed without sediment removal (TB-1) and testbed after sediment removal (TB-2) gave similar values for water temperature, pH, dissolved oxygen (DO), and electrical conductivity. Nevertheless, the average electrical conductivities of the two testbeds were $139{\mu}S/cm$ and $135{\mu}S/cm$, which were lower than the value obtained from the external control point (TB-con; $154{\mu}S/cm$). The small difference in total phosphorus (TP) and total nitrogen (TN) concentrations between the two testbeds implied that sediment removal did not greatly reduce nutrients; however, the phytoplankton cell count had decreased by approximately 37 % in TB-2 (average 1,663 cells/mL) compared to TB-1 (average 2,625 cells/mL). Compared to TB-con, the phosphorus and nitrogen concentrations of the two testbeds had decreased by 39 % and 30 %, respectively, whereas the phytoplankton abundance had decreased by up to 73 %, perhaps because of the blocked inflow of nutrients and the stabilized body of water caused by the installation of the mesocosm. The concentration of geosmin was lower in testbeds than in the external point, because installation of the structures had reduced the cyanobacteria biomass.

Keywords

References

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