1. Graduate School of Symbiotic Systems Science and Technology Fukushima University Kanayagawa Fukushima Japan
2. Sugadaira Research Station, Mountain Science Center (MSC) University of Tsukuba Ueda Nagano Japan
3. Center for Natural Environment Education Nara University of Education Takahata‐cho Nara Japan
4. Yamagata University Kojirakawa‐machi Yamagata Japan
5. Faculty of Symbiotic Systems Science Fukushima University Kanayagawa Fukushima Japan
6. Forestry and Forest Products Research Institute (FFPRI) Tsukuba Ibaraki Japan