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Seasonal and Spatial Variations of Nutrient Fluxes in the Intertidal Flat of Keunso Bay, the Yellow Sea
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  • Journal title : Ocean and Polar Research
  • Volume 30, Issue 3,  2008, pp.225-238
  • Publisher : Korea Institute of Ocean Science & Technology
  • DOI : 10.4217/OPR.2008.30.3.225
 Title & Authors
Seasonal and Spatial Variations of Nutrient Fluxes in the Intertidal Flat of Keunso Bay, the Yellow Sea
Kim, Kyung-Hee; Kim, Dong-Seon;
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In order to investigate the effects of intertidal sediments on the nutrient cycle in coastal environments, the benthic fluxes of ammonium, nitrate, nitrite, phosphate, and silicate at two stations on the intertidal flat of Keunso Bay were determined during each season. The efflux of ammonium was observed at S1 and resulted from the diffusion of remineralized ammonium and acceleration caused by the bioirrigation of macrofauna. The influx of ammonium at S2 was probably due to nitrification in the water column. The influx of nitrate was observed at both stations during all seasons, indicating that the nitrate in the pore water was removed by denitrification. Vigorous bioirrigation led to the efflux of dissolved inorganic nitrogen (DIN) at S1, whereas the influx of DIN at S2 was predominantly caused by denitrification. Contrary to the diffusive and bio-irrigated release of remineralized phosphate from the sediment at S1, the influx of phosphate was observed at S2, which may be attributable to adsorption onto iron oxides in the aerobic sediment layer. Silicate, which is produced by the dissolution of siliceous material, was mostly released from the sediment by molecular diffusion and bioirrigation. However, the influx of silicate was observed at S2 during spring and winter, which was ascribed to adsorption by particulate matter or assimilation by benthic microphytes. The annual fluxes of DIN were 328 mmol at S1 and -435 mmol at S2. The annual fluxes of phosphate were negative at both sites (-2.8 mmol at S1 and -28.9 mmol at S2), whereas the annual fluxes of silicate were positive at both sites (843 mmol at S1 and 243 mmol at S2).
nutrient flux;sediment-water interface;intertidal flat;Keunso Bay;
 Cited by
서해 근소만-선유도 갯벌 퇴적층의 지온변화에 관한 연구,송규민;

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