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有的树木干上易发生不定芽与不定根,或生有气生根。有的枝和根于造型无补,甚至有碍,但于生长有利。这种有利生长而无益造型的根或枝称为助长根、助长枝,也有的称为养枝,台湾称为“牺牲枝”。助长枝主要是枝上的叶,可起光合作用积累养分。助长根则能吸收养分,帮助枝叶生长。根与叶是吸收养分,制造养分的器官,兼有储存养分的作用。根与枝叶有帮助树桩快速生长成形的作用,根与枝叶越多,树木生长越快。根对地上部分整体起作用,但也有对应关系,尤其对根所处的一面的干和枝作用较大。有地下强根的方向,该侧树干树枝的生长更强健,容易形成树棱和强枝,仔细观察许多大树
Some stems prone to adventitious buds and adventitious roots, or students have air root. Some branches and roots in the shape of no complement, or even hinder, but in the growth of favorable. This kind of favorable growth and useless shape of the root or branch called growth root, growth branch, also known as raising branches, Taiwan is called “Sacrifice branch.” Promote the growth of the main branches of the leaves, photosynthesis accumulation of nutrients. Roots help to absorb nutrients, to help foliage growth. Roots and leaves are nutrients, nutrients to create organs, both the role of storage of nutrients. Roots and branches have the role of helping the rapid growth of stumps, the more roots and leaves, the faster the trees grow. The root plays a part in the whole of the ground, but there is also a corresponding relationship, especially for the role of stem and branch on the root side. There is a strong underground root direction, the growth of the trunk side of the trunk more robust, easy to form tree edges and strong branches, carefully observed many trees