1. Kyushu Research Center, Forestry and Forest Products Research Institute, 4-11-16 Kurokami, Kumamoto 860-0862, Japan
2. Faculty of Intercultural Communication, Ryukoku University, Ohtsu, Japan
3. Division of Forest and Biomaterials Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
4. Forestry and Forest Products Research Institute, Tsukuba, Japan
5. V.N. Sukachev Institute of Forest, Russian Academy of Sciences, Krasnoyarsk, Russia
6. Faculty of Agriculture, Kyoto University, Kyoto, Japan
7. Field Science Education and Research Center, Kyoto University, Kyoto, Japan
8. Graduate School of Environmental Science, Okayama University, Okayama, Japan