1. Laboratory of Forest Hydrology, Division of Environmental Science and Technology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
2. Kansai Research Center, Forestry and Forest Products Research Institute, Kyoto 612-0855, Japan
3. College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa 252-0880, Japan
4. Botanical Gardens, Graduate School of Science, Osaka City University, Osaka 576-0004, Japan