摘要：For planning the cleanup of the eutrophic moat water, nutrient taken in algae and seasonal changes of influent and effluent of nutrient were investigated. Samples of moat water, effluent water and influent water such as ground water and storm water, were collected 4 times a year, algae were separated by a filter paper, and nutrients in the filtrate water and non-filtrate water were determined. In summer (August), organic nitrogen in algae increased markedly compared with those in other seasons. Inorganic nitrogen dissolved in water, such as nitrite-nitrogen and nitrate-nitrogen, was not determined. It was considerd that nitrogen in moat water was supplied not only from the ground water but also from the bottom sediment. Phosphate in algae increased in summer and was found a little in other seasons. It was suggested that phosphate in the moat water was supplied only from the ground water.
关键词：water quality of the moat water;algal;nutrient;nitrogen;phosphate;influent and effluent;eutroph;filtration
