Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Modeling the effect of nutrient enrichment on the plankton population: Validation using mesocosm experiment data

영양염 증가에 따른 부유생태계 반응 모의: FVCOM을 이용한 중형폐쇄생태계(Mesocosm) 자료 재현

  • Received : 2011.08.25
  • Accepted : 2011.10.13
  • Published : 2011.10.31
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Abstract

Responses of plankton populations to nutrient enrichment in mesocosm experiments in Shihwa lake were simulated using FVCOM. Dissoloved oxygen module was added to the FVCOM to simulate impacts of its decreased levels. The ecological model included the major components of the pelagic ecosystem including nutrients, phytoplankton (pico-, nano-, micro-), zooplankton (two groups of protozoa, mesozooplankton), particulate organic matter, dissolved organic matter and bacteria, and was calibrated using trophodynamic data collected from Gyeonggi Bay and Shihwa Lake. The model was able to reproduce major responses of plankton populations to nutrient enrichment, including phytoplankton of different size groups, change of dominance of protozoa from < 20 ${\mu}m$ oligotrichs to scuticociliates, and reponses to bacteria and low levels of dissolved oxygen in water column of the mesocosms.

FVCOM을 이용하여 시화호의 부영양화 메소코즘 내 부유생태계 변화 현장실험 결과를 재현하였다. 용존산소는 부영양화된 연안의 지화학생태 반응 결정에 중요한 역할을 하는 요소이나 FVCOM에서는 이를 모의하지 않아 용존산소 모듈을 추가하였으며, 그 적용성을 확인하였다. 수질생태 관련 상태변수를 영양염, 식물플랑크톤(극미소, 미소, 소형), 동물플랑크톤(원생동물 2군, 중형동물플랑크톤), 쇄설성 유기물, 용존성 유기물, 박테리아 그룹으로 설정하고 경기만과 시화호에서 측정된 생물군 간 먹이 상관관계 자료를 기반으로 모델을 구성하였다. 영양염 증가에 따른 메소코즘 내 크기별 식물플랑크톤의 변화 특성과 실험 초기에 나타나는 < 20 ${\mu}m$ 빈섬모충류 우점에서 scuticociliates로의 원생동물 천이 양상 등을 재현할 수 있었으며, 박테리아와 저산소의 영향을 파악하였다.

Keywords

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