关键词: 苹果, 树形, 相对光照强度, 产量, 品质

Abstract: The diference of distribution in relative light intensity.characteristic of canopy space in fruit yield and quality，and their relationships were studied with the four diferent tree canopy shapes in the‘Fuji’ apple orchards.The results howed that the relative light intensity in excess 30% was high and the light istribution in every layers were uniform and parallel arrangement in open center shape．Th e canopy volume ratio of relative light intensity insuficient to 30% were 23.33% ，25.95%，32.86%，40.24%and output were 47.4，46.6，44.9，39.5 t/hm in open center shape，the reform open center from small canopy shape by one year，the reform open center from small canopy shape by two years and small canopy shape respectively．The open center shape were lower 17% in useless light space，higher 20% in output and greater in fruit coloration,solubility solid matter，solubility sugar，fruit shape index and ratio of sugar and acid than small canopy shape.The regression equations in relationships between factors of quality and relative light intensity were set up to obtain optimum range of relative light intensity for good quality in ‘Fuji’ apple．

Key words: Apple, Tree canopy shapes, Relative light intensity, Yield, Quality