Effects of tree shape adjustment on canopy light intensity and seed quality of Torreya grandis'Merrillii'
[Objective]This study aimed to investigate the impact of adjusting the number and opening angle of skeleton branches of Torreya grandis'Merrillii'on canopy light intensity and leaf photosynthesis.Additionally,it aimed to elucidate alterations in carbohydrate,oil content,and other components to reveal the effect of tree shape adjustment on seed quality and provide a scientific basis for the tree cultivation.[Method]Experiments with different numbers and opening angles of skeleton branches were conducted using single-factor and interactive treatments to examine canopy light intensity,leaf photosynthesis,and the contents of soluble sugar,starch,soluble protein,oil and fatty acid components.[Result]Adjusting the opening angle of skeleton branches significantly influenced canopy light intensity.Under the opening angle of 60°,the light intensity in the central and lower layers of the canopy notably increased(P＜0.05)from May to September,peaking at 40 klx in the central layer in July.However,an excessively wide opening angle of 80° led to a decrease of canopy light intensity.Under the interactive treatment of different numbers and opening angles of skeleton branches,the net photosynthetic rate,stomatal conductance,and transpiration rate of the leaves significantly increased in May,July and September(P＜0.05).Carbohydrate analysis revealed that the contents of soluble sugar and starch in seeds under 3 and 4 branches with the opening angle of 60° adjustment(N3-A60° and N4-A60°)were significantly increased(P＜0.05).The content of soluble sugar and starch in the seeds reached 609.05 and 576.63 mg·g-1,respectively.Furthermore,tree shape adjustment significantly promoted the accumulation of soluble protein and oil in the seeds.[Conclusion]The tree shape adjustment of T.grandis'Merrillii'can enhance the canopy light intensity,leaf photosynthesis and seed quality,and the 3 and 4 skeleton branches with the opening angle of 60° has the best promotion effect.[Ch,2 fig.7 tab.38 ref.]
万方数据
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