有明海奥部の干潟・浅海域底泥における窒素・リンの季節変化 Seasonal Variations of Nitrogen and Phosphorus in Bottom Sediment of Tidal Flat and Shallow Water Areas in the Interior Parts of the Ariake Sea
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The seasonal variations of nitrogen and phosphorus in bottom sediments of tidal flat and shallow water areas in the interior parts of the Ariake Sea were investigated during August, 2007-July, 2008. The supply amount of organic matter to sea bottom and sediment temperature had important effects on the seasonal variations of NH<sub>4-</sub>N in porewater. NO<sub>3-</sub>N in porewater was significantly influenced by denitrification and NH<sub>4-</sub>N in porewater that is substrate of nitrification. The seasonal variations of PO<sub>4-</sub>P in porewater were strongly dependent on those of redox environments in bottom sediment. The release rates of NH<sub>4-</sub>N and PO<sub>4-</sub>P were estimated by the diffusion equation. It was found that bottom sediment was an important supply source of NH<sub>4-</sub>N and PO<sub>4-</sub>P during summer-autumn.
- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 65(1), 1031-1035, 2009
Japan Society of Civil Engineers