1. Tohoku Research Center, Forestry and Forest Products Research Institute , Morioka, Japan
2. Chiba Prefectural Agriculture and Forestry Research Center, Forestry Research Institute , Sanmu, Japan
3. Faculty of Regional Environment Science, Tokyo University of Agriculture , Tokyo, Japan
4. Forestry Division, Japan International Research Center for Agricultural Sciences , Tsukuba, Japan
5. Department of Disaster Prevention, Meteorology and Hydrology, Forestry and Forest Products Research Institute , Tsukuba, Japan