Kenji Seiwa1, Yukino Etoh1, Masahiro Hisita1, Kazuhiko Masaka2, Aya Imaji1, Naoto Ueno1, Yoichi Hasegawa1, Miki Konno1, Hiroshi Kanno1, Megumi Kimura1
1Laboratory of Forest Ecology, Graduate School of Agricultural Science, Tohoku University, Naruko-onsen, Miyagi 989-6711, Japan
2Forestry Research Institute, Koshunai, Bibai, Hokkaido 079-0198, Japan