Abstract
The authors investigated the water quality in Lake Barato near downtown Sapporo to the characteristics of eutrophication of lakes in the vicinity of urban areas. We found that (1) the eutrophication of Lake Barato, which has been affected by surrounding waters, could be statistically classified into three groups, (2) the algae concentration of the each group depended on the concentration of phosphorus, especially particulate phosphorus, and (3) among particulate phosphorus, reactive phosphorus may control the growth of algae. Due to seasonal changes and the differences in location of the concentration of phosphorus compounds, the concentration of algae in the lake could potentially increase twice as much as now.
