Toshiaki Owari is Associate Professor of Forest and Water Resources Management at the University of Tokyo, Japan. He is currently the Director of the University of Tokyo Hokkaido Forest, Japan, and Deputy Coordinator of IUFRO Research Group 1.05.00 (Uneven-aged silviculture) and Working Party 1.01.09 (Ecology and silviculture of fir). Sangjun Im is Professor of the Department of Agriculture, Forestry and Bioresources at Seoul National University, Republic of Korea. He is now Deputy Coordinator of IUFRO Research Group 1.06.00 (Restoration of degraded sites) and a member of the editorial board of Landslides and Landscape and Ecological Engineering. Biing T. Guan is Professor of the School of Forestry and Resource Conservation, National Taiwan University, Taipei, Taiwan.