洪水撹乱と周辺植物の影響に着目した希少河原植物生育地の成立および維持機構

抄録

Projects aiming to restore the habitat of rare vegetation on gravel bars have been increasing after the pass of Law for the Promotion of Nature Restoration in Japan. However, conservation of the habitat can be difficult because of decreasing flood disturbance and increasing grasses and trees now. Therefore, it is important to know how the habitat of rare species have been affected by differences of flood disturbance and competition with ambient plants. The purpose of this paper is to examine the process of the growth of rare plants caused by flood disturbance and competition with ambient plants. As a result of numerical simulation and filed surveys, we have shown that the plants can grow when the shear stress（τ）that works at the bar about 0.04(kN/m²) and the elevation from water level is above 2.5m. The area is the boundary between bare gravel bed and Amur silvergrass.