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Abstract

Based on data for riparian revegetation for Phragmites japonica and Carex dispalata, a situation was surveyed in which ecotones ware formed. In place with riparian revegetation, the planted species were dominant and spreaded in the water area, which contributed to creation of a diverse riparian environment, for instance by decreasing the flow velocity in the riparian area. Phragmites japonica grew runners and spreaded throughout the growth area. It readily creates riparian ecotones, even in rapids. However, in some cases, the plant grows as high as 2 m, which obstructs view and undesirable from a landscape point of view. In the cases in Carex dispalata, which does not obstruct view, was used, vegetated bank protection was formed in the stream. The growth area of Carex dispalata is smaller when the roots are in the water and stems of the plants are above the water. However, it is expected to function as a riparian ecotone. When using a coconut fiber roll, vegetation bank protection must form before the coconut fiber deteriorates. It is important that planted plants advances to a water side, especially to diversify the waterside environment. For the reason, Phragmites japonica and Carex dispalata, a perennial plant which can advance to a water areas, must be planted.