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The Assessment of Trophic State and the Importance of Benthic Boundary Layer in the Southern Coast of Korea  

이재성 (국립수산과학원 해양환경부)
김기현 (충남대학교 해양학과)
김성수 (국립수산과학원 해양환경부)
정래홍 (국립수산과학원 해양환경부)
박종수 (국립수산과학원 해양환경부)
최우정 (국립수산과학원 해양환경부)
김귀영 (국립수산과학원 해양환경부)
이필용 (국립수산과학원 해양환경부)
이영식 (국립수산과학원 해양환경부)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.9, no.4, 2004 , pp. 179-195 More about this Journal
Abstract
The trophic state of the coastal waters of the southern part of Korea was assessed using biogeochemical data obtained from the National Marine Environmental Monitoring Program conducted by the National Fisheries Research and Development Institute for six years. The trophic state of different areas, analyzed by non-metric multi-dimensional scaling (MDS) analysis, could divide the areas into three groups. Masan Bay, with suboxic water masses and/or the highest concentrations of dissolved inorganic nitrogen and phosphorus occurred, was assessed as being in a hypertrophic state. Ulsan Bay, Onsan Bay, Busan and Jinhae Bay, located near strong point sources, were in a eutrophic state. Other areas, including Tongyong, Yosu, Mokpo and Jeju island, were evaluated as being in a mesotrophic state. During 1997 to 2002, the average values of excess nitrogen, which is the difference between the measured dissolved inorganic nitrogen (DIN) and the corrected DIN using the Redfield ratio, were positive at Ulsan, Onsan, and Busan, where there were inflows from polluted rivers. In contrast, those were negative values in Haengam Bay, Gwangyang Bay and nearby Yosu. This suggests that the limiting element for phytoplankton growth differed among sites. The time series data of excess nitrogen showed gradual decrease over time in the hypertrophic waters, but the opposite trend in the mesotrophic waters. This indicated that the ratio of nitrogen to phosphate varied according to the trophic state of the coastal waters. The enrichment of organic matter in sediment in eutrophic waters would disturb the normal pattern of biogeochemical cycling of nitrogen and phosphate. In order to assess the condition of the coastal environment, the benthic boundary layer should be considered.
Keywords
Trophic State; Eutrophication; Redfield Ratio; South Sea;
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