Abstract
Many projects to create rivers rich in nature are pushed on. However, the aimed conditions of nature are not always clarified. The vegetation of rivers plays important roles in habitation of various animals. Therefore, as the first step towards clarifying the desirable vegetation, this study focuses on the actual conditions of vegetation and influences of both hydrological regime and population density along rivers on the number of plant communities and species. The vegetation on riverside lands was investigated mainly based on the nationwide survey of the vegetation on riverside lands carried by the Ministry of Construction. The vegetation on riverside lands is greatly different river by river and showed a tendency to increase in rivers with higher coefficient of regime and to be influenced by human activities.
