Biogeochemical Organic Carbon Cycles in the Intertidal Sandy Sediment of Nakdong Estuary

낙동강 하구 갯벌 사질 퇴적물에서 생지화학적 유기탄소순환

  • Lee, Jae-Seong (Marine Environment Research Team, Marine Environment Division, NFRDI) ;
  • Park, Mi-Ok (Marine Environment Research Team, Marine Environment Division, NFRDI) ;
  • An, Soon-Mo (Department of Marine Science, Pusan National University) ;
  • Kim, Seong-Gil (Marine Environment Research Team, Marine Environment Division, NFRDI) ;
  • Kim, Seong-Soo (Marine Environment Research Team, Marine Environment Division, NFRDI) ;
  • Jung, Rae-Hong (Marine Environment Research Team, Marine Environment Division, NFRDI) ;
  • Park, Jong-Soo (Marine Environment Research Team, Marine Environment Division, NFRDI) ;
  • Jin, Hyun-Gook (Marine Enivironment Team, East Sea Fisheries Institute, NFRDI)
  • 이재성 (국립수산과학원 해양환경부 환경연구팀) ;
  • 박미옥 (국립수산과학원 해양환경부 환경연구팀) ;
  • 안순모 (부산대학교 해양학과) ;
  • 김성길 (국립수산과학원 해양환경부 환경연구팀) ;
  • 김성수 (국립수산과학원 해양환경부 환경연구팀) ;
  • 정래홍 (국립수산과학원 해양환경부 환경연구팀) ;
  • 박종수 (국립수산과학원 해양환경부 환경연구팀) ;
  • 진현국 (국립수산과학원 동해수산연구소 해양환경팀)
  • Published : 2007.11.30

Abstract

In order to understand biogeochemical cycles of organic carbon in the permeable intertidal sandy sediments of the Nakdong estuary, we estimated the organic carbon production and consumption rates both in situ and in the laboratory. The Chl-a content of the sediment and the nutrient concentrations in below surface pore water in the sandy sediment were lower than in the muddy sediment. The sediment oxygen consumption rates were relatively high, especially when compared with rates reported from other coastal muddy sediments with higher organic carbon contents. This implied that both the organic carbon degradation and material transport in the sandy sediment were enhanced by advection-related process. The simple mass balance estimation of organic carbon fluxes showed that the major sources of carbon in the sediment would originate from benthic microalgae and detrital organic carbon derived from salt marsh. The daily natural biocatalzed filtration, extrapolated from filtration rates and the total area of the Nakdong estuary, was one order higher than the maximum capability of sewage plants in Busan metropolitan city. This implies that the sandy sediment contributes greatly to biogeochemical purification in the area, and is important for the re-distribution of materials in the coastal environment.

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