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STUDY ON BIOLOGICAL CYCLING OF MICROELEMENTS IN PINUS MASSONIANA PLANTATIONS Genetic Variation and Differentiation of Larix decidua Populations in Swiss Alps (in English) Carbon Density and Storage of Acacia mangium Plantation Ecosystem in Nanning, Guangxi Primary Analyses of Regeneration Communities on the Cutting Blanks of Tropical Mountain Rain Forest on the Jianfengling Ridge’ Hainan Island