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동해 표층수 중 영양염과 Chlorophyll α의 분포 특성

윤상철;윤이용
Yoon, Sang Chol;Yoon, Yi Yong

  • 투고 : 2015.09.15
  • 심사 : 2016.04.21
  • 발행 : 2016.05.25

초록

2009년 7월 3일부터 7월 27일까지 러시아 조사선 R/V Lavrentyev를 이용하여 러시아 연안으로부터 4개의 Line(D, R, E, A)을 따라 표층 30 m 수심의 시료를 26개의 정점(울릉분지와 일본분지를 포함한 동해의 전 수역)에서 채수하여 영양염 및 엽록소-${\alpha}$의 농도를 분석하였다. 냉수역보다 난수역에서 1.4배 높은 질산염을 제외한 나머지 항목들은 모두 난수역보다 냉수역에서 높게 나타났다($NH_4$, $PO_4$ 각 1.8배, $Si(OH)_4$ 1.2배, 엽록소-${\alpha}$ 1.9배). 암모니아와 인산염, 엽록소-${\alpha}$의 수평분포는 매우 유사한 분포를 보이며, 한류와 저층수의 용승 영향권에 있는 러시아 근해에서 최대치를 보이고, 울릉분지에서 비교적 낮은 분포를 보인다. 반면, 질산염은 대마난류수의 직접적인 영향권에 있는 울릉분지에서 최대치를 보이며, 점차 북상할수록 감소한다. N/P 비는 한류수계보다 대마난류 중층수에서 가장 높은 값을 보이며, 대마난류수는 동해로 유입되는 질산염의 주요 공급원으로 작용하고 있다. 그러나 난수역에서 인산염의 평균 농도는 $0.2{\mu}M$ 이하로 식물플랑크톤 성장의 제한 요인으로 작용할 수 있는 반면, 냉수역에서의 높은 농도는 엽록소-${\alpha}$와 직접적인 상관성을 보이고 있다. 해양환경에 영향을 미치는 주요인을 분석하기 위한 주성분 분석결과 주성분 I은 수온에 의해 동해의 해양환경이 주로 영향을 받으며, 주성분 II는 영양염과 엽록소-${\alpha}$ 가 주요인으로 작용한다. 따라서 연구해역의 해양환경은 수온에 지배되며, 그에 따라 냉수역과 온수역으로 구분되는 특성을 보였다.

키워드

영양염;엽록소-${\alpha}$;동해;연안용승;난수역;냉수역

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과제정보

연구 과제 주관 기관 : 국립수산과학원