Abstract:

This study investigated the effects of human disturbance (selection cutting) on coarse woody debris (CWD) in Korean Pine and broad_leaved mixed forest on Changbai Mountain. The forests were classified into two categories according to disturbance history: natural forest and selection cutting forest. The average volumes of CWD were 78.88 m³·hm^-2 in natural forest and 41.7 m³·hm^-2 in selection cutting forest, respectively. In natural forest, 94% of the volume of CWD consisted of fallen logs, 5.8% of standing dead trees and 0.2% of cut stumps. Most of the volume of CWD belonged to 2～40 cm diameter class. In selection cutting forest, 55% of the volume of CWD consisted of cut stumps, 41% of fallen logs, 4% of stand standing dead tree, Most of the volume of CWD belonged to 11～50 cm diameter class. Covered areas of CWD in natural forest and selective cutting forest were 376.2 and 189.3 m²·hm^-1 respectively. Percentage of fallen logs in E decay class of natural forest and selective cutting were 33^5% and 14% respectively. Selection cutting method reduced fallen logs considerably. To retain the natural forest characteristics of CWD, management strategy should be reconsidered in managing forest.

Key words: forest management, coarse woody debris(CWD), Korean Pine and broad-leaved mixed forest, Changbai Mountain