A tidal flat is an important place for sea environments. In recent years , creation of an artificial tidal flat has increased to restore the lost natural environments by developments in the past. We investigated the environmental characteristics of the artificial lagoon tidal flat in "Wild-Bird-Watching-Park in Tokyo Port" , and compared the characteristics with other tidal flats in Tokyo Bay. Then we measured the water quality in the channels between tidal flats and Tokyo Bay for two tidal cycles at every one or two hours. Form the study, we found that the value of ignition loss is high and benthic polychaeta are dominant species of the tidal flats. And then , we found the nutrientfl uxes of NH4-N and PO4-P pass through the channels were flow out from the tidal flat to Tokyo Bay. We thought that quantity of primary production was low in the artificial tidal flat in Tokyo Port .
This paper describes the self-purifying function in term of water quality of a tidal flat in the Tokyo Port Wild Bird Park (TWBP). In this study, the authors carried out field observations of water quality over 2 tidal cycles and estimated nutrient fluxes between a tidal flat and the adjacent sea in the summers of 2006, 2007, and 2008. Sampling of benthos and bottom sediments and counting of water birds were carried out in the field. From the study, the authors found following the results: (1) This flat functions as a net sink of nitrogen and chlorophyll-a and a net source of phosphorus in summer. (2) Nutrient fluxes between sediments and the overlying water are large in proportion to the tidal flat area. (3) The amount of TN and TP removal by water birds is not very large compared to TN and TP fluxes between the tidal flat and the adjacent sea.
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