Author(s)

S. Yamochi, R. Yanagawa & K. Oda

Abstract

Nitrogen budget at two artificial tidal flats along the coastal area of Osaka Bay, Japan S. Yamochi, R. Yanagawa & K. Oda Department of Urban Engineering, Graduate School of Engineering, Osaka City University, Japan. Abstract Budgets of nitrogen, suspended solids and chlorophyll a were studied in September 2000 and June, August, September and October 2001 at the north pond of Nanko Bird Sanctuary and at an artificial tidal flat of Hannan Second District, Osaka Bay, Japan. At the north pond of Nanko Bird Sanctuary, the output of suspended solids to coastal water exceeded its input to the pond, while chlorophyll a was intercepted within the pond through the tidal exchange. Dissolved inorganic nitrogen imported into the pond was temporally incorporated into the biomass and was then exported in the form of dissolved organic nitrogen. Particulate nitrogen was abundant as a resource of nitrogenous nutrients to coastal water in the summer of 2001. These phenomena are thought to be correlated with bio

Keywords