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*Takami Satomura
Field Science Center for Northern Biosphere, Hokkaido Univ.
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Norikazu Eguchi
Graduate School of Agriculture, Hokkaido Univ.
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Kaichiro Sasa
Field Science Center for Northern Biosphere, Hokkaido Univ.
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Takayoshi Koike
Research Faculty of Agriculture, Hokkaido Univ.