Abstract
The present study is a survey of vegetation and composition of species in the river bed and on the river shore of the Amakawa River, a small river with a series of three types of channel works. Comparison of vegetation in each facility type section showed that the number of species was larger in the section where there were only revetment works, and significantly smaller in the sections where the river bed was also concreted. As for species composition, in the section where the river bed was covered by concrete brick in order to prevent bed-erosion, annual plants such as Persicaria thunbergii and Bidens frondosa were dominant, and the ratio of alien species was high. It was found that even very small changes in the shape of each facility led to small changes in sedimentation which led to changes in the composition of species. In river bed and river shore vegetation management, it is important to consider how even slight changes in the shape of erosion-control works will influence vegetation.
