Water samples were collected in the Minami-Asakawa River in Tokyo. Mean daily loading and budgets of some bioelements, such as carbon, nitrongen and phosphorus, were estimated. Suspended matter(75%), organic carbons(60%) and ammoium(59%) appeared to b...
Water samples were collected in the Minami-Asakawa River in Tokyo. Mean daily loading and budgets of some bioelements, such as carbon, nitrongen and phosphorus, were estimated. Suspended matter(75%), organic carbons(60%) and ammoium(59%) appeared to be removed by self-purification processes. On the other hand, nitrate, nitrite and chlorophyll a, which were considered to be produced in situ, increased with the river flow. The urban river is not only a transportation channel of bioelements but also a place for their metabolism.