Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Effect of Cut-off Intervals on Nutrients Removal Efficiency in Hydrophytes at the Artificial Vegetation Island

인공수초재배섬에서 수생식물 지상부 절취주기별 수중영양염류 제거효율

  • Park, Hae-Kyung (Han River Water Environment Research Center, National Institute of Environment Research) ;
  • Byeon, Myeong-Seop (Han River Water Environment Research Center, National Institute of Environment Research) ;
  • Choi, Myung-Jae (Han River Water Environment Research Center, National Institute of Environment Research) ;
  • Yun, Seok-Hwan (Han River Water Environment Research Center, National Institute of Environment Research) ;
  • Jeon, Nam-Hui (Han River Water Environment Research Center, National Institute of Environment Research)
  • 박혜경 (국립환경과학원 한강물환경연구소) ;
  • 변명섭 (국립환경과학원 한강물환경연구소) ;
  • 최명재 (국립환경과학원 한강물환경연구소) ;
  • 윤석환 (국립환경과학원 한강물환경연구소) ;
  • 전남희 (국립환경과학원 한강물환경연구소)
  • Received : 2008.10.28
  • Accepted : 2009.01.23
  • Published : 2009.03.30
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Abstract

We investigated the most effective cutting interval for underwater nutrient removal through cut off the emergent part of hydrophytes at artificial vegetation island (AVR) which was installed for the purpose of water quality improvement in Lake Paldang. We divided the planting area of Phragmites japonica into three parts according to the cutting intervals. The shoot height and relative growth rate of P. japonica, nutrient contents and biomass of cut off P. japonica were measured at each cutting interval. The amount of nutrients which were removed through cut off at each cutting interval was calculated. P. japonica showed full growth, 80% and 60% of full growth before first cut off at three-months, two-months and one-month cutting interval condition respectively. Three-month cutting interval condition showed the largest biomass of cut off P. japonica and one-month cutting interval condition showed the least. However the cut off P. japonica showed the highest content of nutrients at one-month cutting interval condition and the least at three-month cutting interval condition. The amount of phosphorus and nitrogen removal at two-month cutting off condition is the largest among three cutting interval conditions indicating that cut off the emergent part of P. japonica every two months is the most effective to remove the nutrients from water at AVR in eutrophic lakes.

Keywords

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