Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Geochemical Properties of Sedimentary Phosphorus of Daechung Lake in Autumn, Korea

추계 대청호 퇴적물 내 인의 지화학적 특성

  • Shim, Moo Joon (Geum River Environment Institute, National Institute of Environmental Research) ;
  • Yang, Yun Mo (Geum River Environment Institute, National Institute of Environmental Research) ;
  • Oh, Da Yeon (Geum River Environment Institute, National Institute of Environmental Research) ;
  • Hwang, Yun Ho (Korea Institute of Science and Technology) ;
  • Lee, Soo Hyung (Geum River Environment Institute, National Institute of Environmental Research)
  • 심무준 (국립환경과학원 금강물환경연구소) ;
  • 양윤모 (국립환경과학원 금강물환경연구소) ;
  • 오다연 (국립환경과학원 금강물환경연구소) ;
  • 황윤호 (한국과학기술연구원) ;
  • 이수형 (국립환경과학원 금강물환경연구소)
  • Received : 2015.06.11
  • Accepted : 2015.09.30
  • Published : 2015.09.30
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Abstract

This study was conducted in autumn to determine phosphorus (P) fraction in sediments of Daechung Lake, to elucidate controlling factors for sedimentary P, and to compare with the other areas. For this study, sediment samples were collected at 6 sites only once on November 2014 using ponar grab and analyzed for solid-phase P (Loosely adsorbed, Fe-bound, Al-bound, detrital apatite, and refractory organic P) by sequential extraction. Total phosphorus (TP) was relatively high in front of Daechung Dam and Hoinam where fish farm was run until 1997. The dominant sedimentary P form was Al-bound P, followed by Fe-bound P, which could be released from sediment to water column during suboxic state. Based on principal component analysis, Al-bound P, Fe-bound, and TP were controlled by grain size of sediments. Loosely adsorbed, detrital apatite, and refractory organic P were relatively highly accumulated at the mouth of major tributaries where suspended sediments were delivered. Sedimentary P concentrations in Daechung Lake sediments were not higher than in other lake sediments. Therefore, based on these results, major controlling factors were grain size and input of suspended sediments from tributaries.

추계 대청호 퇴적물에서 가장 많이 존재하는 인의 형태는 환원환경이 되면 용출될 수 있는 Al-bound와 Fe-bound 인으로 나타났다. 총인, Al-bound와 Fe-bound 인은 가두리 양식장이 분포하였던 회남 지점과 대청댐 앞에서 높게 나타났다. 그 이유는 가두리 양식장 같은 인위적인 활동보다는 세립질 퇴적물의 이동과 연관이 있는 것으로 판단된다. 대청호 퇴적인의 농도는 그 어느 존재형태도 타 인공호수에 비해 높지 않았다. 그러나 보다 더 객관적인 비교를 위해서 존재형태별 연속추출법을 표준화해야 할 것이다.

Keywords

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