Abstract
Forest road constructions sometimes damage the natural environment in the forest. For the forest road coexists and harmonizes with the natural environment, it is important that damaged areas make smaller. The purpose of this paper is to estimate scales and conditions of damaged forest areas with the forest road construction. We investigated 50 forest roads (285 places) and each forest road ledger, and analyzed these data by the simple tabulation and the quantification theory of the first type. As a result of this analysis, when the road width is large, the width of damaged forest area tends to be wide. However, the retaining wall and the masonry have effect on making the small damaged forest area. Moreover, the maximum damaged forest area must estimate about 3.5 times as large as the road width.
