环剥对杧果幼树光合作用及根韧皮部糖含量和成花的影响

为了探索环剥对抑制杧果幼树旺盛的营养生长、提早结果的影响机理,以台农一号杧果为试材,在其主干上进行环剥、螺旋环剥、环割等处理,研究各处理对叶片净光合速率、根韧皮部可溶性糖含量、翌年成花的影响。结果表明,与对照相比,不同处理均显著降低了叶片净光合速率和根系韧皮部中的可溶性糖含量,其中环剥的降幅最大,螺旋环剥的次之,环割的最小;杧果定植后第二年,环割处理翌年单株成花数量为49个,显著高于其他处理的;定植后第三年,环剥、螺旋环剥、环割和对照的单株成花数量分别为193个、183个、170个和22个。说明对于营养生长较旺的杧果幼树,定植后第二年即可通过主干环割提早结果,第三年主干环剥的成花效果最好。

Effect of girdling on photosynthesis and content of sugar of root phloem and flower bud formation

In order to explore the mechanism of girdling on controlling the vigorous shoot growth and bearing early,Tainong No.1 mango was conducted as tested material.Girdling,spiral girding,scoring were carried out at trunk of Mango young trees.Results indicated that the net photosynthetic rate and content of soluble sugar in root phloem were significantly reduced by all treatments compared with the control.The response of girdling was the largest,spiral girding was the secondary and scoring was the smallest.On the other hand,in the second year after planting,the number of inflorescence per plant was 49 when using scoring,obviously higher than that of other treatments.In the third year after planting,the number of inflorescence was 193,183,170 and 22 by girding,spiral girdling,scoring and control,respectively.It was conclusion that scoring in the second year after planting and girdling in the third year after planting should be conducted when the plant grows vigorously.