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Peking Univ, Sch Adv Agr Sci, China Ctr Agr Policy, Beijing 100871, Peoples R China
Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Ctr Chinese Agr Policy, Beijing 100101, Peoples R China Peking Univ, Sch Adv Agr Sci, China Ctr Agr Policy, Beijing 100871, Peoples R China