The Simulate Of Ligt Intercept Of Three-dimensional Digital Model Of Different Peach Tree Canopy And Measuring Of Fruit Quality And Photosynthetic Traits

In this study,the Trunk,Spindle,Open center shape(“Bayuecui”) was as test materials,combining with the measured indicators of trees,using 3D digital and computer technology,in accordance with the spatial coordinates of trees,could be divided trunk shape tree into 16 regional,in order to study the space distribution of the tree bodybranches, number of fruit, fruit quality and light interception(STAR value);Comparative analysis of thedaily accumulation of photosynthetic available radiation, temperature and humidity change and net photosynthetic rate, chlorophyll content of 4 different parts ofSpindle and Open center shape peach tree canopy.The main research results were as follows:1. Set up the three-dimensional digital model of Trunk shape peach tree canopy.The numberofSPwas the most that which mainly distributed in(1-1.8m,40-60cm) and(1.8-2.6m,20-60 cm); SS mainly distributed in(1.8-2.6m,20-40cm) and(>2.6m,>60cm); MS mainly distributed in(1-1.8m,>40m),(>2.6m,>40cm),(1.8-2.6m,20-60cm); LS mainly distributed in(>2.6m,>40cm) and(1-1.8m,>60cm);WSwas mainly distributed in(1-1.8m,>60cm).The Trunk shape peach treehavea maximum branches-class STAR valuein(>2.6m,<20cm),followed by was(1.8-2.6m,>60cm) and(>2.6m,>20cm),and exist significant difference between other parts; Increase of SP and SS number can make the fruit acidity and total soluble solids increasing,especially the moderate growth of STAR value of WS and FS significantly increase the acidity of the fruit.2.Established the three-dimensional digital model of Spindle and Open center shape(“Bayuecui”) peach tree canopy. Analysis the leaf angle distribution of canopy and discovered that about this two kinds of tree,theleaf rolling angle distributionwas most concentrated within the range(-300,300),and the accountof WS and LS for this range remain as the second and third,illustrated that this kind of two trees and shoot have a similar rollingangle distribution.Within the scope of rollingangle: for spindle,FS distribution centers most and SSdistribution at least; for Open center shape,SP distribution is most concentrated, MS distribution in the least.Elevating angle distribution within the range(-600,150)is the most concentrated, within the scope of rolling angle the SP and LS distribution features are similar in the two kinds of tree. FS account of the smallest.3. Established the annual change model of Mean Daily Photosynthetic Active Radiation(DPAR) andTemperature and Humidity of 15 parts of Spindle and Open center shape peach tree canopy. Before September 15,the DPAR of east-westof Spindle is higher than north-south sides and change tendency is consistent,but after September 15,DPAR of four location are significantly increased; About the Open center shape peach tree,south-east side trends consistent and east is always greater than the south before September 15,after that day,south will overtake east.Open center shapeDPAR max=56.96mold-1m-2,Spindle DPAR max=49.84mold-1m-2. The extent of increase of decrease about Humidity of Spindle was generally higher than Open center shape tree,otherwise,the frequency of decrease is bigger than increase.4. Determined the different photosynthesis intensity,chlorophyll content(SPAD) and physiological indexes such as fruit quality of tree canopy,studied of different tree photosynthetic characteristics. The net photosynthetic rate(Pn)curve of the west of Spindle and the south-north direction of Open center shape peach were unimodal curve,andthe peak point appeared in early July; Pn of south-northof Spindle and east about the two tree has been reduced since the end of June. Chlorophyll content of Spindle peach tree is greater than the north in the middle of June and early July, however,the end of June,middle of July and end of July have the contrarychlorophyll content,and the most obvious difference was in middle of June.The fruit longitudinal and transverse diameter and titratable acid content of Spindle by significantly greater than the open center shape tree,fruit soluble solids and hardness is below than the open center shape.The every shoot STAR value of Open center shape tree kept negative correlation with the fruit quality index and kept a significantly positive correlation with total soluble solids,single fruit weight and longitudinal and transverse diameter.