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Effects of Canopy Position on Leaf Structures in Golden-Leaf Privet(Ligustrum×vicaryi) Genetic Variation of Leaf Traits at Different Canopy Positions of Section Aigeiros Clones and Indirect Selection for Growth Nutrient dynamics in Quercus mongolica leaves at different canopy positions.  Comparisons of anatomical structure, component and photosynthetic capacity of leaves at different apple canopy positions