稀植苹果园高产稳产树的冠形以扁圆形或有明显层间距的凸字形较好,叶面积系数以5～7为宜。 光分布与果实产量、质量有较为密切的关系。从产量看,果实主要分布在相对光强为2～55％的层间内。果实着色的程度、可溶性固形物与滴定酸的比值随相对光强的增加而增加。 Thin planting apple orchard high-yielding tree crown-shaped to oblate or obvious layer spacing of the convex shape is better, the leaf area factor of 5 to 7 is appropriate. Light distribution and fruit yield, quality are more closely related. From the yield point of view, the fruit is mainly distributed in the relative light intensity of 2 ~ 55% of the floor. The degree of fruit coloring, soluble solids and titration acid ratio increased with the relative light intensity.