Canopy Digital Simulation And Evaluation Index Filtration Of Light Efficient And Flowering Easily Tree Architecture Of 'fuji' Apple

‘Fuji' is one of the largest varieties of apple in China,but the phenomenon of “on” and “off” year is common in production.Tree architecture is an important basis of tree cultivation for high yield and quantity,but for poor in-depth research,3D digital tree evaluation technology can accurately describe the canopy structure,for the construction of apple best tree and the tree evaluation of quantitative indicators of screening.In the light of this,this study is based on Bibaum and Tall spindle 4-year-old and 5-year-old young trees,which is the ‘Fujiko' test material.The growth of two kinds of trees,flowering,fruit quality and orchard yield were investigated in two consecutive years.Three-dimensional digital technology is used to simulate tree canopy and analyze the difference between two tree structures and light interception.Two kinds of tree architectures virtual orchard light interception was analyzed.With a view to the filtration of the digital simulation of ‘Fuji' apple canopy and the evaluation index of high light efficiency,which is from side of tree architecture.The main results are as follows: 1.Comparison of conventional evaluation indexes of Bibaum and Tall spindle ‘Fuji' trees.For tree height and trunk roughness,Bibaum ‘Fuji' trees are significantly less than Tall spindle,while for growth rate of tree height,root stock roughness and trunk roughness,Bibaum is greater than tall spindle.Cause Bibaum ‘Fuji' trees can enter the fertile period earlier.In addition,Bibaum trees' flowering rate of all kinds of shoots are higher than that of tall spindle.Moreover,the Bibaum has higher medium and shorter shoot ratio,and the shoot composition is more reasonable to form higher yield.The content of soluble solids of Bibaum ‘Fuji' trees are slightly higher than that of tall spindle,and there are no evident differences in fruit weight,hardness and fruit coloration.The 4-yearold Bibaum is slightly higher than Tall spindle in t single plant fruit number and single plant yield,but the yield per mu is lower.The 5-year-old Bibaum is significantly higher than tall spindle in every yield index.2.Comparison of tree structures and canopy light interception in isolation of Bibaum and Tall spindle ‘Fuji' trees.On the strength of the 3D digitization technology,Bibaum is significantly greater than tall spindle in the average number of shoot,the number of leaves and the total leaf area of trees,and there was no significant difference in the 5-year-old trees.The results showed that the Bibaum trees are growing rapidly after planting and can form the “fruit wall” quickly in the early stage of construction.Based on the virtual canopy,The STAR of Bibaum and Tall spindle is 0.43 and 0.40 for 4-year-old trees while 0.42 and 0.41 for 5-year-old trees.Obviously,Bibaum is always greater than Tall spindle,but the difference is not significant because the trees are small.For bourse shoot STAR,it is bigger for 4-year-old Tall spindle,while it is bigger for 5-year-old Bibaum.The bourse shoot canopy distribution is more reasonable than Tall spindle.3.Comparison of the evaluation of Bibaum and Tall spindle ‘Fuji' trees in the virtual orchard.Based on the virtual canopy,two kinds of virtual orchards for 4-year-old and 5-year-old trees were established respectively,and the number of suitable trees in each virtual orchard was selected as 49.In the virtual orchard,the STAR value of Bibaum is taller than Tall spindle.In virtual orchards,SATR of short vegetative shoots reduce most,and Babium is much less than the tall spindle decrease.It is indicated that the STAR value of whole canopy and short vegetative shoot is lower than that of tall spindle.Insides,for two kinds of trees with the same tree age,Light mutual shading(Lms)was always smaller than that of the tall spindle,and the difference was significant in 5-year-old trees.The results showed that the tree was less influenced by the surrounding trees than the Tall spindle tree with the tree growing.5.Evaluation index filtration of light efficient and flowering easily tree architecture.According to the canopy digital simulation results of the analysis,this study preliminarily screened the evaluation indexes of high light efficiency and easy formation of flowers trees.The whole canopy and Bourse shoot STAR values respectively as individual tree canopy lighting of one of the precision evaluation index.At the same time,in the virtual orchard,canopy STAR dipped proportion relative isolation and Lms can be one of the evaluation index of orchard overall illumination.