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树木靠绿叶的光合作用制造养分,只有保留适当数量的枝杈,才能满足树木生长发育需要的营养物质。侧枝过多,枝杈横生,消耗养分过多,影响生长,易长成“小老树”。杨、柳、榆、槐等树种,特别是稀植和栽植在“四旁”的,侧枝和分杈更多,进行合理修枝,有利于迅速长成干型通直的良材。1.修枝标准:树冠(树头)高度应保留到全树高的1/3～/12。现在各地普遍存在修技过苦的现象,严重地影响了树木的正常生长。据试验,
Trees rely on the photosynthesis of green leaves to create nutrients, only to maintain the appropriate number of twigs, in order to meet the growth and development of trees need nutrients. Excessive collateral branches twigs, excessive consumption of nutrients, affecting growth, easy to grow into “little old tree.” Poplar, willow, elm, Huai and other tree species, especially sparsely planted and planted in the “four sides,” more branches and bifurcation, a reasonable pruning, is conducive to the rapid growth into dry-type straight material. 1. Pruning standards: crown (tree head) height should be retained to the full height of 1/3 ~ / 12. Now everywhere there is a phenomenon of over-cultivation and over-cultivation, which seriously affects the normal growth of trees. According to the experiment,