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前言在枣树的枝干上其形成层每年都有活动,春季形成层細胞分裂快、个大壁薄、在材质上表現疏松而色淺,一般称为春材;由夏季到秋季,形成层的活动漸次减低,細胞分裂和生长漸慢,則个小壁厚,材质上密致而色深称为秋材。春材与秋材間的划分比較明显,表現出多次同心园环这就是年輪。每一年輪的生长包括当年形成的春材和秋材,代表着当年木质部的生长,由于年輪年复一年的增加,使枣树的干径(树干直径)逐年加大,因此年輪的寬狹或谓干径的粗細就标志着树的年龄和生长。
Preface The jujube branches of its formation on the annual activities, the formation of layers in spring fast cell division, a large wall thin, loose and light in the material performance, commonly known as spring; from summer to autumn, the formation of layers The activity gradually decreased, cell division and growth slowly, then a small wall thickness, the material on the dense and color depth known as autumn material. The division between spring and autumn material is more obvious, showing many concentric circles this is the annual ring. The growth of each year round includes the spring and autumn materials formed in that year, representing the growth of xylem in that year. Due to the year-by-year growth of annual rings, the stem diameter of tree jujube (trunk diameter) has been increasing year by year. Or that the thickness of dry diameter marks the tree’s age and growth.