Acknowledgements
This study was carried out in the project ‘‘S-2-1b Enhancement
of CO2 sink by improving of silvicultural technology in tropical
forest’’ (Prof. Yuji Ide, The University of Tokyo, financially
supported by the Ministry of the Environment, Japan) and in the
project ‘‘Improvement of forest resources for recycled forest
products’’ (Prof. Toshihiro Ona, Kyushu University, financially
supported by CREST of JST-Japan Science and Technology, Japan).
Special thanks to Dr. Barry Roser, Shimane University, Japan, for
valuable comments on the manuscript.