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Dong Hun JI
Graduate School of Agriculture, Hokkaido Univ.
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Satoshi KITAOKA
JSPS:FFPRI Hokkaido Research Institute
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Dong Su CHOI
Graduate School of Agriculture, Tokyo Univ. of Agr. And Tec.
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Myong Jong YI
Graduate School of Forest and Environmental Science, Kangwon National Univ.
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Tsutom HIURA
Hokkaido Univ. Forests., FSC
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Takayoshi KOIKE
Research Faculty of Agriculture, Hokkaido Univ.