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*Karibu Fukuzawa
Field Science Center for Northern Biosphere, Hokkaido University
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Tatsuro Nakaji
Field Science Center for Northern Biosphere, Hokkaido University
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Masahiro Nakamura
Field Science Center for Northern Biosphere, Hokkaido University
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Hiroyuki Oguma
Center for Global Environmental Research, National Institute for Environmental Studies
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Tsutomu Hiura
Field Science Center for Northern Biosphere, Hokkaido University