问:树木为什么会出现连理现象? 答:树木枝干发生连结现象,称为连理枝。要了解这种现象的形成,首先需要知道树木茎的构造和生长。树木的茎干是由树皮、韧皮部、形成层、木质部和髓心构成的。茎在横断面上的生长加粗,表现为年轮的形式。形成层每年向内产生木质部细胞,向外产生韧皮部细胞。木质部的增加,直接构成木材的本身;韧皮部的增加,继续产生新的树皮。年复一年,树木就逐渐加 Q: Why does the tree appear even phenomenon? A: The phenomenon of the link between the branches of trees, known as even branches. To understand the formation of this phenomenon, we first need to know the structure and growth of tree stems. The stem of a tree consists of bark, phloem, cambium, xylem and pith. Stems grow thicker in cross-section and appear in the form of annual rings. The cambium produces xylem cells inward every year, producing phloem cells outward. An increase in xylem directly constitutes the wood itself; an increase in phloem continues to produce new bark. Year after year, trees are gradually added