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Researches on Correlation and Geographic Variation in Wood Chemical Compositions of Betula platphylla in Natural Stands A REVIEW OF THE STUDIES ON THE PHENOTYPIC VARIATION OF FOREST TREES IN NATURAL STANDS 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 Photosynthetic Characteristics of Picea schrenkiana var. tianschanica of Different Age Classes in a Natural Stand in the Central Part of Tianshan Mountains Variation Pattern of Individual Types and Wood Characters in Natural Stands of Schima superba