Relationship Between Relative Light Intensity In The Different Canopy Parts And Growth Of Tree And Fruit Yield And Quality Of Luntaibaixing

In order to study the relationship between growth and development, yield and quality and themicroclimate in the tree canopies of Luntaibaixing. The method of division in canopy was used to study thedistribution and dynamic change law of the light intensity, temperature and relative humidity, and therelationship between the microclimate in the tree canopies and flower bud formation, flowering, fruit set,chlorophyll content, leaf area, louver weight, fruit yield and quality of apricot trees with different view ofmain branch.1. The distribution of relative light intensity, PAR and temperature in the canopy of two crown shapeswere gradually increased from lower to upper, inner to outer and the effect light region of60°crown shapewas more than30°crown shape for2.66%; The diurnal variation of PAR, relative PAR and temperaturewere all single peak curve, and shape Ⅱ is higher; But the relative humidity distribution was gross oppositewith temperature and light intensity.2. The abortive percentage in the canopy of two crown shapes were all upper＜middle＜lower in thevertical direction, and were all middle＜outer＜inner in horizontal distribution of canopy; the number andsurvival rate of flower bud of two crown shapes were all upper＞middle＞lower in the vertical direction,and were all outer＞middle＞inner in horizontal distribution of canopy, and the number and survival rate offlower bud of shape Ⅱ were all higher than shape Ⅰ.3. The flower buds are all in pistil differentiation stage in the end of September, but differences exist inthe differentiation process of different parts. There were significant differences in horizontal and verticaldirection, and different positions were all significantly different. At all, the bud differentiation processbecomes gradually faster from the lower to the upper and the inner to the outer of canopy.4. The change of leaf chlorophyll content and leaf area in different tree shape were all increased as thetime change; The leaf chlorophyll content, leaf area and weight of hundred leaves in same parts of differentshape were all significant difference in the vertical direction, and the three factors of shape Ⅱwere higheror bigger than the shape Ⅰ; The leaf chlorophyll content in different parts of qanopy were all significantdifference in the vertical and horizontal directions, and the upper and outer were more higher, but leaf areaand weight of hundred leaves just have significant difference in the vertical direction and all higher in theupper.5. The fruit set percentage in vertical direction of different canopy were all the upper significant higherthan the lower, respectively for6.27%and4.5%; in the horizontal direction were the middle significanthigher than the inner, outer was in middle. The fruit set percentage in middle, upper, inner and outer of thecanopy were all significant difference.6.The yield in the canopy of apricot trees with different view of main branch were all distribution in themiddle-level and middle part, and some positions had significant difference, and the yield of60°crownshape was more higher with33.22kg; the yield of30°crown shape was29.41kg.7. The fruit weight, pH value, Vc content, soluble solids, total sugar and sugar-acid ratio in the canopygradually increase from lower to upper layer, inner to outer, and they were positively correlated with lightintensity, temperature, but negatively correlated with relative humidity; Contrastlly, fruit shape index, peelfirmness and titratable acid content of fruit are gradually decrease trend from lower to upper layer, inner toouter, and they were negatively correlated with light intensity, temperature, but positively correlated withrelative humidity. The effected of different view of main branch on fruit weight, peel firmness, Vc content,content of total sugar and titratable acidity content was significantly, but not obvious on fruit shape index,pH value, soluble solids content and sugar acid. And besides the fruit weight and fruit shape index, theothers quality index of shapeⅡ were all higher than shapeⅠ. The quality of shapeⅡ is better.8.The regression equations in relationships between quality factors and relative light intensity,temperature and relative humidity were setup and the obtained suitable were obtained: The suitable relativelight intensity of shape Ⅰ and shape Ⅱ are41.20%to79.07%and33.24%to65.00%, the requirement ofshape Ⅰ for light intensity was higher. The suitable temperature of shape Ⅰ and shape Ⅱ are24.65℃to30.00℃and26.39℃to37.16℃. The suitable relative humidity of shape Ⅰ and shape Ⅱ are45.60%to59.50%and29.12%to64.31%.The light intensity is the dominant effect factor of fruit quality, then thetemperature, least the relative humidity.