Abstract
Hiking trail degradation of this area was deciphered with the aerial photograph. It was deciphered that sheet erosion had begun from 1964 or before. Although degradation area became the maximum at the first half of the 1980s, the wooden stairs constructed from 1987 suppressed sheet erosion, and it became the distribution of the present bare ground. However, in the area that the gully erosion was still advancing and was formed gully erosion in hiking trail covered by the thick soil layer. Moreover, degradation has occurred also about the newly constructed wooden stairs. There is widely bare ground of hiking trail on gentle slope, and it was a grassland before. The hiking trail degradation is distributed along a hiking trail with many hiker. The place in which the gully erosion develop is an area where a thick soil layer exists.
