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*Hajime Kobayashi
Hokkaido Branch of Kyushu University Forests
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Naoaki Tashiro
Hokkaido Branch of Kyushu University Forests
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Kotaro Sakuta
Faculty of Agriculture, Kyushu University
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Daisuke Ougi
Hokkaido Branch of Kyushu University Forests
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Tetsuo Okano
Faculty of Agriculture, Shinshu University