Abstract
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 NH4-N in porewater. NO3-N in porewater was significantly influenced by denitrification and NH4-N in porewater that is substrate of nitrification. The seasonal variations of PO4-P in porewater were strongly dependent on those of redox environments in bottom sediment. The release rates of NH4-N and PO4-P were estimated by the diffusion equation. It was found that bottom sediment was an important supply source of NH4-N and PO4-P during summer-autumn.
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