Effect of planting density on photosynthetic characteristics and fruit quality of hybrid Prunus simonii
[Objective]Provide reference for the healthy development of the Prunus simonii industry.[Method]The 5-or 6-year-old P.simonii trees were selected as the research object with three common planting densities(4 m×3 m,4 m×5 m,2 m×5 m)in Wensu county,Aksu prefecture,Xinjiang.The relationship between planting density and photosynthetic characteristics,yield,and fruit quality was studies by using variance analysis and principal component analysis methods to select the appropriate planting density.[Result]Different planting densities had similar trends in net photosynthetic rate,inter-cellular CO2 concentration and leaf transpiration rate during different phenological stages,and all of them peaked at the fruit color change stage under the influence of density planting and slowly decreased during ripening,and the trend of stomatal conductance change was not significant;the daily photosynthetic changes of three planting densities all showed bimodal curves,with the obvious phenomenon of"photosynthetic lunch break".The total chlorophyll content of the leaves at different planting densities was 4 m×3 m,2 m×5 m and 4 m×5 m in a descending order,and the total chlorophyll content of the outer leaves of the tree crown was higher than that of the inner leaves,with significant differences;The ratio of chlorophyll a to chlorophyll b content was 4 m×5 m,2 m×5 m and 4 m×3 m from high to low,and the ratio of chlorophyll a to chlorophyll b content in the inner leaves of the tree crown was higher than that in the outer leaves.This indicated that leaves fully utilize light energy by increasing chlorophyll content in low light environments;The fruit quality was decreased with the planting density of 4 m×3 m,2 m×5 m,4 m×5 m and 4 m×3 m in the inner and outer crown of the tree based on the mean values of vitamin C,cellulose,calcium,potassium,soluble sugar,and total pectin,which was the content of 5.70 μg/g,13.77 mg/mg,0.40 μg/mL,0.36 mg/L,6.76 mg/g and 1.51 mg/g respectively.The comprehensive ranking of fruit quality with different planting densities,from best to worst,was 4 m×3 m(peripheral),2 m×5 m(peripheral),4 m×5 m(peripheral),4 m×3 m(inner chamber),2 m×5 m(inner chamber)and 4 m×5 m(inner chamber).[Conclusion]In terms of photosynthetic capacity,chlorophyll content,light energy conversion efficiency,and fruit yield and quality,the planting density of 4 m×3 m is more advantageous than the other two planting densities,which is the ideal planting density.
NETL
NSTL
万方数据
