Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Long-term Change of Phytoplankton Biomass (chlorophyll-a), Environmental Factors and Freshwater Discharge in Youngsan Estuary

하구언 담수방류와 영산강 하구 식물플랑크톤 생체량 및 환경인자의 장기변동

  • Yoon, Bo-Bae (Korea Basic Science Institute) ;
  • Lee, Eo-Jin (Department of Marine Environmental Engineering and Biotechnology, Mokpo National Maritime University) ;
  • Kang, Tae-Ahn (Department of Marine Environmental Engineering and Biotechnology, Mokpo National Maritime University) ;
  • Shin, Yong-Sik (Department of Marine Environmental Engineering and Biotechnology, Mokpo National Maritime University)
  • 윤보배 (한국기초과학지원연구원) ;
  • 이어진 (목포해양대학교 환경.생명공학과) ;
  • 강태안 (목포해양대학교 환경.생명공학과) ;
  • 신용식 (목포해양대학교 환경.생명공학과)
  • Received : 2013.03.12
  • Accepted : 2013.06.21
  • Published : 2013.06.30
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Abstract

In Yeongsan River estuary, located in the southern West Coast, a dike was constructed in December 1981. After the construction of a dike, discharge mechanism of fresh water has been changed, the water quality and chlorophyll-a are expected to be influenced by fresh water discharge. We investigated temporal and spatial variations and long-term trend of phytoplankton biomass (chlorophyll-a) and environmental factors. The concentrations of nutrient and chlorophyll-a were generally high in summer and the concentrations were increased toward downstream. Surface/bottom salinity difference was negatively correlated with salinity in surface water but positively with nutrient and chlorophyll-a. TN, TP and DIN concentrations were generally increased over 10 years. This study can provide information for better management of water quality for Youngsan River estuary.

영산강 하구에서 담수 유입이 부유생태와 수질에 미치는 영향을 파악하기 위해 국가해양환경측정망 장기자료(1999~2008년)인 클로로필 a와 수질 항목들에 대한 계절적, 공간적 변화와 장기변동 추세를 분석하였다. 분석결과, 여름철 (8월) 영산강 방조제 인접정점의 염분은 조사기간 중 가장 낮은 분포를 보였고, 영양염류와 클로로필 a는 전반적으로 높은 분포를 나타냈다. 영산강 담수유입의 지시인자인 표-저층의 염분차 (${\Delta}salinity$)와 영양염류, 클로로필 a는 유의한 양의 상관성을 나타냈으나, 지난 10년동안 담수 방류량은 감소하는 추세를 보였고, 영양염류, 클로로필 a는 전반적으로 증가하는 경향을 나타냈다. 이러한 결과는 영산강 하구 해역 영양염의 공급원이 담수유입뿐만 아니라 인근 지역의 발달에 따른 점오염원 증가 등의 추가적인 요인이 존재할 가능성을 제시한다. 따라서 영산강 하구 주변 해역의 부영양화 방지를 위해서는 영산강 방조제의 방류와 연관한 수질개선방안 마련과 더불어 인근 지역의 점 오염원 파악 및 관리가 병행되어야 할 것으로 사료된다.

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