Abstract
The purpose of this paper is to clarify the patterns of forests damage on various site condition. The relationships between the forests damage patterns and site condition were discussed. There are three reason for forest damage in this area. One reason, the forests damage was caused by typhoon. The dead trees became like bleached bone. The site condition in the dead tree area is very similar at each study area: the direction of the wind is blowing from south-east. Topography is characterised by the mountain top and upper parts of ridge. In addition to these dead tree area, the small patches of dead trees appeared on the top of the ridge in direction of north-west slope blowing over from south-east wind. The growth of advanced seedlings in closed forest is very slowly but under the open canopy it is so fast. Consequently, changes of growth patterns were proved to be destroyed the canopy by typhoon or other reason. The results of annual ring analysis suggest the forests damage was caused by typhoon, in 1982. Second, the forest damage was occurred by seasonal wind at mountain top and ridge as mountain effect. The third reason is landslide, especially, top and side edge of big volcanic land slide area. According to newspaper, the forest damage in this area was occurred by acid rain. But we can not ditect the dead trees caused by acid rain except for a little leaves discoloration, but the causes were unknown. Currently, the forest damage in this area is considered as the one type of natural regeneration.
