In order to evaluate the effect of site protection for restoration of uncovered stand floor vegetation due to trampling, we carried out the restoration experiment at three secondary stands of Quercus serrata from June 1998 to October 2002. The restoration experiment was carried out with the cultivating surface soil both in the protection site and in the opened site, at each stand. As results, only in the largest stand with nine hectors width, the coverage and the numbers of species of herb layer were increased more in the protected site than in the opened site. Also, the percentage of the species, which are characteristic in the secondary stands of Quercus serrata, was increased at the protected site only in the largest stand. Thus, the site protection is concluded as effective for applying larger stands than nine hectors width to restore stand floor vegetation due to trampling.
