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논문 상세정보

섬진강 하구역에서 염분경사에 따른 입자성 유기물질의 분포

Distribution of Particulate Organic Matters along the Salinity Gradients in the Seomjin River Estuary

초록

1999년 3월부터 2001년 4월까지 섬진강하구역에서 염분경사에 따른 부유입자물질 (SPM), 엽록소 $\alpha$, 입자유기 탄소 (POC)와 질소 (PON) 그리고 입자유기규소 (PBSi)의 분포를 조사하였다. 조사 정점은 지리적 위치보다는 각 조사시마다 표층염분을 현장에서 측정하여 결정하였다. 섬진강으로부터 다량의 육수가 유입됨에도 불구하고 대부분의 조사시기에서 SPM의 농도는 20mg/L 이하로 낮아 섬진강을 통해 유입되는 육상기원의 SPM 공급은 낮은 것으로 판단된다. 1999년 11월의 5$\~$15psu (난초도로부터 10$\~$20km), 2000년 4월의 15$\~$25psu (10$\~$20km), 그리고 2000년 10월의 약1$\~$15psu (15$\~$20km) 염분구간에서는 엽록소 a농도가 약 8$\~$58$\mu$g/L로 매우 높았으며 POC, PON 및 PBSi의 농도도 매우 높았다. POM의 농도가 매우 높았던 염분역을 포함한 중간염분역에서의 POC와 엽록소 $\alpha$ 비가 비교적 낮아 POC의 대부분이 식물플랑크톤으로 구성되어 있음을 보여주고 있다. 반면, 초저염분역과 하구 입구에서는 POC와 엽록소 $\alpha$ 비가 상대적으로 높아 담수 및 저층으로부터의 detrital POC 공급이 있었음을 의미한다. 따라서 섬진강 하구수역에서의 비교적 낮은 SPM 농도와 중간염분역에서의 높은 엽록소 $\alpha$ 농도 및 낮은 POC와 엽록소 $\alpha$ 비는 식물플랑크톤 생산이 염분에 따른 POM의 분포를 조절하는 가장 중요한 요인임을 시사해 준다.

Abstract

The distributions of suspended particulate matter (SPM), chlorophyll a, particulate organic carbon (POC) and nitrogen (PON) and particulate biogenic silica (PBSi) along the salinity gradient were investigated in the Seomjin River estuary from March 1999 to April 2001. Sampling sites were set based on the surface salinity during each cruise rather than geographic locations. Concentrations of SPM were less than 20 mg/L, suggesting relatively low input of terrestrial SPM despite large freshwater discharge through Seomiin River, Chlorophyll a peaks occurred at 5$\~$ 15 psu salinity zone (10$\~$20 km from Nan Cho Island) in November 1999, at 15$\~$25 psu (10$\~$20 km) salinity zone in April 2000 and at 1$\~$15 psu salinity zone (15$\~$20 km) in October 2000 (ca. 8$\~$58%\mu$g/L). Concentrations of POC, PON and PBSi were also high at the same zone. Relatively low ratios of POC to chlorophyll a in mid-salinity zone where POM peak occurred suggests high contribution of living phytoplankton to the total POC. On the other hand, relatively high ratios of POC to chlorophyll $\alpha$ in very low salinity zone and the mouth of estuary indicated relatively high portions of detrital POC. Consequently, the low concentrations of SPM in this estuary and the high concentrations of chlorophyll $\alpha$ and the low ratios of POC to chlorophyll $\alpha$ in the mid-salinity zone suggest that production of living phytoplankton is primary factor in controlling distribution of POM along the salinity gradients in the Seomjin River estuary.

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이 논문을 인용한 문헌 (4)

  1. Park, Mi-Ok ; Kim, Seong-Soo ; Kim, Seong-Gil ; Kwon, Jinam ; Lee, Suk-Mo ; Lee, Yong-Woo 2012. "Factors Controlling Temporal-Spatial Variations of Marine Environment in the Seomjin River Estuary Through 25-hour Continuous Monitoring" 한국해양환경공학회지 = Journal of the Korean society for marine environmental engineering, 15(4): 314~322 
  2. Lim, Hyun-Sig ; Choi, Jin-Woo ; Choi, Sang-Duk 2012. "Spatial Distribution of Macrobenthos in Sueocheon Stream Estuary at the Nothern Part of Gwangyang Bay, Korea" 바다 : 한국해양학회지, 17(2): 76~86 
  3. Park, Mi-Ok ; Lee, Jae-Seong ; Kim, Seong-Soo ; Kim, Seong-Gil ; Lee, Suk-Mo ; Lee, Yong-Woo 2014. "Variations of Dissolved Inorganic Nutrient Flux through the Seomjin River Estuary" Journal of environmental science international = 한국환경과학회지, 23(6): 1049~1060 
  4. Kang, Sung Hyo ; Lee, Jung Ho ; Park, Sung Wan ; Shin, Hyun Chool 2014. "Temporal and Spatial Distribution of Benthic Polychaetous Communities in Seomjin River Estuary" 바다 : 한국해양학회지, 19(4): 243~255 

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