2021 Volume 47 Issue 1 Pages 9-14
In forests on man-made filled slopes between Haki IC and Asakura IC along Oita expressway in Japan, pruning to reduce tree height and thinning (hereafter, referred to as plantation management) were conducted by different methods. The purpose of this study was to obtain a reference for management plan in consideration for the natural environments of the surrounding area by investigating the vegetation 2 years after management. As results, plantation management did not affect the number of plant species, and it maintained a state similar to the forest edge type. The third layer that was pruned based on the target tree height was composed mainly of planted species in plantation management, and the predominance of invasive plant species was higher with a higher thinning rate. As the strength of pruning increased, dominant plant species that preferred the relatively bright forest floor became more in the fourth layer.
