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Geographic Pattern of Phenotypic Features of Phyllostachys pubescens in Natural Stands An Approach to Sustainable Management of Population Genetic Resources of Trees Ⅱ. Management Analysis of Plantation and Natural Population of Some Autochthonous Tree Species in China Researches on Correlation and Geographic Variation in Wood Chemical Compositions of Betula platphylla in Natural Stands Variation Pattern of Individual Types and Wood Characters in Natural Stands of Schima superba