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STUDIES ON INTERSPECIFIC ASSOCIATION OF BOTH Castanopsis orthacantha AND Castanopsis delavayi COMMUNITIES AT JIZU MOUNTAIN,YUNNAN PROVINCE Intra-specific competition of Emmenopterys henryi and its accompanying species in the Dapanshan National Nature Reserve of Zhejiang Province Generalized Algebraic Difference Site Index Model for Ponderosa Pine in British Columbia, Canada Evaluation method of regional forest landscape carrying capacity—A case study of Wuyuan County,Jiangxi Province