Abstract
In order to collect data on the restoration of the grassland plants, we resumed vegetation management in a forest where grassland management was ceased 30 years ago.We use three sets of management techniques,“brush cutting after thinning”,“only thinning”and“control”. One 20 meter×10 meter plot was assigned to each set,and the height and diameter of plant stems in the plots were determined along with the vegetation and light factor in 2 meter square sub-plots. In brush cutting after thinning plot, grassland species appeared and their dominance increased. In the only thinning plot too, several grassland plants appeared, but the dominance of all plants decreased. On the other hand, these grassland plants did not occur in the control plot. The relative quantum flux density of photons crossed 20 % near the ground in the thinning and brush cutting plot. However in only thinning plot, this value was less than 10 %. These results showed that thinning and brush cutting were effective vegetation management techniques to ensure the appearance of and the increase in grassland plants.
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