The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Characteristics of Marine Environment and Primary Productivity of Phytoplankton in the Seaweed Bed of Northwestern Coast of Jeju Island During Autumn 2014

2014년 추계 제주 북서부 해조장에서 해양환경과 식물플랑크톤의 일차생산력 특성

  • KWON, HYEONG KYU (Korea Inter-University Institute of Ocean Science, Pukyong National University) ;
  • YANG, HAN SOEB (Department of Oceanography, Pukyong National University) ;
  • YOON, YANG HO (Faculty of Marine Technology, Chonnam National University) ;
  • CHOI, OK IN (Ecology and Restoration Division, Korea Fisheries Resources Agency) ;
  • CHOI, IM HO (Ecology and Restoration Division, South Sea Branch, Korea Fisheries Resources Agency) ;
  • OH, SEOK JIN (Department of Oceanography, Pukyong National University)
  • 권형규 (부경대학교 해양과학공동연구소) ;
  • 양한섭 (부경대학교 해양학과) ;
  • 윤양호 (전남대학교 해양기술학부) ;
  • 최옥인 (한국수산자원관리공단 생태복원실) ;
  • 최임호 (한국수산자원관리공단 남해지사 생태복원실) ;
  • 오석진 (부경대학교 해양학과)
  • Received : 2015.08.05
  • Accepted : 2015.11.12
  • Published : 2015.11.30
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Abstract

Marine environmental characteristics and primary productivity of phytoplankton were investigated in seaweed bed of northwestern coast of Jeju Island during Autumn, 2014. The trophic state based on dissolved inorganic nitrogen and phosphorus was mesotrophic. The Redfield ratio was less than 16, indicating that nitrogen was the limiting factor for the growth of phytoplankton. Dissolved organic nitrogen and phosphorus accounts for 63 and 46% of the dissolved total nitrogen and phosphorus, respectively. Light utilization efficiency (${\alpha}$) and maximum photosynthetic capacity ($P_m{^B}$) were highest in the Donggwi (third-year marine forest), followed by Gonae (one-year marine forest), Biyangdo (natural seaweed bed) and Geumneung (whitening area). The primary productivity of phytoplankton in the Donggwi, Gonae and Biyangdo also was higher than that in the Geumneung. Although nitrogen is the limiting factor, enriched dissolved organic nitrogen might play an important role to maintain primary productivity. In addition, phytoplankton community through photosynthesis could produce about 14% of phytoplankton carbon in one hour. These results will be able to use the important information for material cycle and ecological valuation of seaweed bed.

2014년 추계에 제주 북서부 연안의 해조장에서 해양환경 및 식물플랑크톤의 일차생산력 특성을 파악하였다. 연구 해역의 용존태 무기 질소와 용존태 무기 인은 중영양의 영양상태였으며, Redfield ratio는 16 이하로 무기 질소가 식물플랑크톤의 성장에 제한 요인으로 나타났다. 또한 용존태 유기 질소와 용존태 유기 인은 각각 용존태 총 질소와 용존태 총 인 중 약 63%, 46%를 구성하고 있었다. 광 이용 효율(${\alpha}$)과 최대 광합성량($P_m{^B}$)은 동귀(바다숲 조성 3년 경과 해역), 고내(바다숲 조성 1년 경과 해역), 비양도(천연해조장), 금능(갯녹음 해역) 순으로 감소하였다. 또한, 식물플랑크톤의 일차생산력은 해조장이 위치한 해역이 갯녹음 해역에 비해서 높았다. 특히, 연구해역은 무기 질소가 제한된 환경이지만 상대적으로 풍부한 용존태 유기 질소는 높은 일차생산을 유지하기 위한 중요한 요인으로 작용할 것이다. 뿐만 아니라 광합성을 통해 한 시간 만에 전체 식물플랑크톤 탄소량의 약 14%를 생산할 수 있는 것으로 나타났으며, 이는 해조장의 물질순환과 생태적 가치평가를 위한 중요한 자료로 활용할 수 있을 것이다.

Keywords

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