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柳树适应能力很强,即所谓“无心插柳柳成荫”.柳树为什么容易成活呢?因为,在柳条外部绿色皮层和内部本质部的中间,有一层形成层。形成层和髓射线的中间(木材中心叫髓,由髓向四周发射的线叫髓射线)有许多分生能力很强的薄壁细胞群.这个薄壁细胞群能够迅速分裂繁殖,形成根的“原始体”.当柳枝插到土里以后,如果温度、湿度、光照等条件适宜,根的原始体就会逐渐发育,变成新的根,能很快独立“营生”。
The ability of willows to adapt is so-called “unintentional willow shades.” Why would willows survive? Because, in the middle of the wicker outer green cortex and internal essence, a layer is formed. In the middle of the cambium and the medullary ray (the center of the wood is called the pulp, the line emitted from the pulp to the periphery is called the medullary ray.) There are many parenchymatous cell populations that are capable of dividing rapidly and then forming roots “Pristine body.” When the willow sticks into the soil, if the temperature, humidity, light and other suitable conditions, the root of the original body will gradually develop into a new root, can quickly independent life.