Abstract
The number of trees remaining and the situation of damage occurring by brush cutting were examined in artificial forests of Fagas-crenata and Aesculs-turbina (9-year forests). The number of Fagas crenata and Aesculs turbinata , had decreased 30-50% during the 9-year period after planting. This was much higher than the 5% decrease in the number of Cryptomeria japonica and Chamaecyparis obtusa. The damage occurring in the forest of Fagas crenata and Aesculs turbinata was mostly caused by brush cutting, herbivoes, and insects. Brush cutting caused as much as 40-70% of the damage. The average plant height of the non-damaged trees of Fagas crenata (130cm) and Aesculs turbinata (180cm) was much higher than that of the damaged trees, which were 40 and 70cm in height respectively. Most of the damaged trees were covered by shrubs and herbs (100cm in height). The trees showed death of the main axis or damage by herbivores followed by regrowth.
