Relationship Between The Change Of Tree-structure Indexes And Yield Formation Of Saving-labor And High-quality System In Pear Orchard

In this test, trees of different age from2to8years of ‘Xueqing pear’with dense pillarsystem were used for the studies of dynamic change of the tree structure indexes (the typeand the number of branch, trunk cross-sectional area, leaf area index, orchard coverage)and yield, the relationship between different tree structure indexes with yield, and therelationship of each tree structure indexes. To reveal the change rule and the innerrelationship of tree structure indexes. The main conclusions wee as follows:1.The dynamic change of main tree structure indexes and yield of saving-labor andhigh-quality pear orchard as follows: Branches of per plant showed a trend of increase, andstabilized at around160.0at age6to8. Trunk cross-sectional area showed a growth trend,and the increment of full bearing of was low. The leaf area index showed growing trendtowards, and stabilized at4.50-4.70at age6to8. The orchard coverage also showedgrowing trend, but reduced to less than60%after6year.2.There were correlation-ship between main tree structure indexes and yieldformation of saving-labor and high-quality pear orchard. The relationship of the totalbranch and the spur with the yield were both correlation of indices. Related equations wererespectively y=668.36e0.5039x, R2=0.992and y=837.23e0.6465x, R2=0.9716; Therelationship of the trunk cross-sectional area with the yield was correlation of powermultiplicative. The correlation equation is y=120.79x1.2335, R2=0.9861; The relationshipof the leaf area index with the yield was correlation of indices. The correlation equation isy=775.16e0.5062x, R2=0.9813; The relationship of the orchard coverage with the yieldwas correlation of indices. The correlation equation is y=620.38e0.0428x, R2=0.9601.The correlation order of the yield an the main influence factor was: trunk cross-sectionalarea>branch number> leaf area index> orchard coverage.3.The relationship of branches and trunk cross-sectional area was logarithmiccorrelation. The relationship of branches and leaf index area was parabolic correlation. Therelationship of branches and orchard coverage was linear correlation. The relationship oftrunk cross-sectional area with leaf index area and orchard coverage were both paraboliccorrelation. The relationship of leaf index area and orchard coverage was powermultiplicative. 4.The criteria values for tree structure indexes of full bearing of saving-labor andhigh-quality pear orchard,with7000kg/666.7m2-7500kg/666.7m2and the ratio of highquality fruit was more than93%, as follows: planting space was0.75m x3m, branch ofper tree was160.0, the total branch was (4.7-4.9) x104/666.7m2, the ratio of spur was66.0%-76.0%, the ratio of bearing branch and vegetative branch was about1.7, the trunkcross-sectional area was above30cm2, leaf area index was4.50-4.70, orchard coveragewas50%-60%.