Abstract
This paper describes the function of the self-clarification of water quality by tidal flat in the Tokyo Port Wild Bird Park. In this study field, the authors carried out the field observations of water quality over 2 tildal cycles and estimated nutrient fluxes between tidal flat and adjacent sea in the summers in 2006, 2007 and 2008. And the sampling of benthos and bottom sediments and counting of number of water birds were carried out in this field. From this study, the authors found following results. (1) Function of this flat is net sink for nitrogen and chlorophyll-α and net source for phosphorus in summer. (2) Nutrient fluxes between sediment and water column are large in budget of tidal flat area. (3) Amount of TN and TP removal by water birds is not so large compared to TN and TP fluxes between tidal flat and adjacent sea.
