Acknowledgements
We thank Kazuhito Kita and Nobuhiro Akashi (Hokkaido Research
Organization) for their help to investigate the inland and coastal
sites; Atsushi Nakanishi and Keiko Kitamura (Forest Research and
Management Organization) for their cooperation of the investigation;
Akiko Takazawa and Yasuyuki Komatsu for their assistance in the
laboratory work; Mineaki Aizawa (Utsunomiya University), and Ichiro
Tamaki (Gifu Prefectural Research Institute for Forests) for their
suggestions for improving the manuscript.