1. Department of Forest Site Environment Division; Forestry and Forest Products Research Institute; Tsukuba, Ibaraki; Japan
2. Graduate School of Agriculture; Kyoto University, Kyoto; Kyoto; Japan
3. PT. Musi Hutan Persada; Muara Enim, South Sumatra; Indonesia
4. Hokkaido Research Center; Forestry and Forest Products Research Institute; Sapporo, Hokkaido; Japan