1. Department of Disaster Prevention, Meteorology and Hydrology, Forestry and Forest Products Research Institute, Tsukuba, Japan
2. Department of Wood Properties and Processing, Forestry and Forest Products Research Institute, Tsukuba, Japan
3. Shikoku Research Center, Forestry and Forest Products Research Institute, Kochi, Japan
4. Department of Forest Soils, Forestry and Forest Products Research Institute, Tsukuba, Japan