1. Department of Forestry, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Korea
2. Division of Forest Management, Korea Forest Research Institute, 57 Hoegiro, Dongdaemun-gu, Seoul 130-712, Korea
3. Department of Forest Resources, Sunchon National University, 413 Jungangno, Suncheon, Jeollanam-do 540-742, Korea