Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Nutrients Removal Efficiency by Vegetation Density on Constructed Wetland from Small Watershed

소수계 유역 인공습지에서 식생 밀도 차이에 다른 영양염류 제거효율

  • Ko, Jee-Yeon (National Yeongnam Agricultural Experiment station) ;
  • Kang, Hang-Won (National Yeongnam Agricultural Experiment station) ;
  • Lee, Jae-Sang (National Yeongnam Agricultural Experiment station) ;
  • Kim, Chun-Song (National Yeongnam Agricultural Experiment station) ;
  • Sakadevan, K. (School of Science, Food and Horticulture, University of Western Sydney) ;
  • Bavor, H.J. (National Yeongnam Agricultural Experiment station)
  • 고지연 (영남농업시험장 식물환경과) ;
  • 강항원 (영남농업시험장 식물환경과) ;
  • 이재생 (영남농업시험장 식물환경과) ;
  • 김춘송 (영남농업시험장 식물환경과) ;
  • ;
  • Published : 2003.12.31
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Abstract

This study was conducted to evaluate effects of 2 constructed wetlands with different vegetation states (plumpton park wetland and Woodcroft park wetland) for reducing non-point source pollution from small watershed consisted of residential and agricultural area in suburban district of Sydney, Australia. The total nitrogen and phosphate removal efficiency of Plumpton park constructed wetland, composed of stable and dense vegetation, were 38.3% and 26.2% and Woodcroft park constructed wetland having still poor vegetation due to the short time to settle down transplanted plants after construction, showed relatively low removal efficiency of 20.2% and 14.0%. The removal efficiency of inorganic nutrients such as $NH_4-N$, $NO_3-N$, $PO_4^{-3}$ were higher than total nitrogen and phosphate because plants and microorganisms in rhizosphere of constructed wetlands took up inorganic nutrients shortly. According to the type of wetland inflow, the nutrients removal efficiency of storm water flow was lower than base flow.

호주 시드니 인근 도 농 복합 소도시로부터 발생하는 비점오염원을 처리하기 위하여 설치된 Plumpton park와 Woodcroft park 인공습지의 처리효율을 살펴본 결과, 수생식물의 밀도가 증가하고 식생이 안정된 Plumpton Park 인공습지에서 T-P의 26.2%, T-N의 38.3%, 식생분포가 안정적이지 않은 Woodcroft park에서 14.0%와 20.2%가 각각 제거됨으로서 인공습지에서 식물체와 식물체 근권 미생물에 의한 T-P 및 T-N의 제거 효율이 상당히 큼을 알 수 있었다. 또한 T-N와 T-P에 비하여 $NH_4-N$, $NO_3-N$, $PO_4^{-3}$의 제거율이 높았던 것은 무기태 형태의 영양염류가 식물 및 미생물에 더 쉽게 이용되었기 때문으로 생각된다. 이상의 결과로 볼 때 인공습지에서 식물체와 근권 주위 미생물에 의한 염류제거는 인공습지가 설치한지 오래되었을 때도 효과적이었고, 또한 인공습지는 무기태 영양염류의 제거효율이 더욱 높았으므로 무기화학비료 등의 용탈이 일어나기 쉬운 농경지 비점오염원으로 부터 발생하는 수질오염의 개선에 이용할 수 있는 경제적이고도 효율적인 system으로 고려되었다.

Keywords

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