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*Yota Kikuchi
Department of Forest Science, Faculty of Agriculture, Utsunomiya University
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Tatsuhiro Ohkubo
Department of Forest Science, Faculty of Agriculture, Utsunomiya University
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Mikio Kaji
Graduate School of Frontier Sciences, The University of Tokyo
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Seiji Ishibashi
University Forest in Chichibu, Graduate School of Agriculture and Life Sciences, The University of Tokyo
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Haruo Sawada
University Forest in Chichibu, Graduate School of Agriculture and Life Sciences, The University of Tokyo