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*Kaichiro Sasa
Field science center for Northern Biosphere Hokkaido Univ.
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Haruhiro Mamiya
Field science center for Northern Biosphere Hokkaido Univ.
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Masanori Takeshita
Graduate School of Agriculture
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Kei Suzuki
Graduate School of Agriculture
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Hidenori Takahashi
Graduate School of Environmental Earth Science Hokkaido Univ.
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Yancheng Meng
Institute of Soil Science and Fertilizer, Guangxi Academy of Agriculture Science, China
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Guifen Chen
Institute of Soil Science and Fertilizer, Guangxi Academy of Agriculture Science, China