Tentative Soning Plan of Revegetation to Artificial Slopes by Trees at the Nukui Dam, Hiroshima Prefecture

HIKASA Mutsumi, YAMASAKI Wataru

doi:10.5632/jila.63.461

Holistic revegetation plans, which is very important to carry out the efficient and effective revegetation, are hardly made in most developmental projects in Japan. We designed the tentative plan for large artificial slopes around the Nukui Dam in Hiroshima Prefecture. At first, we compared the artificial slopes' visibility from human to decide the order of revegetation priority. We calculated the visible areas of each slopes using GIS spatial analysis tool, and clarified the priority quantitatively. Secondary, the spatial distributions of the representative communities were analyzed by vegetation maps to set the objective vegetation. Quercus serrata community was most widely distributed around the dam site. Pinus densiflora community consisted of small patches placed in ridges. In contrast, Zelkoua serrata-Fagus japonica community was placed in valley. Finally, we selected six dominant tree species which existed in these communities, and investigated the geographical features of their habitats, slope aspect and degree. Quercus glauca and Q. salicina were limited in slopes to the south or southeast. Slope degree did not restrict their habitat strongly. We concluded that Q. serrata community is the best as the general target vegetation. Another species should be selected according to the slope aspect and topography.

Tentative Soning Plan of Revegetation to Artificial Slopes by Trees at the Nukui Dam, Hiroshima Prefecture

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