According to its yearly developmental rhythm, the root system is partial renewal type and withering not only absorb roots but also fine branches.

就其年发育节律而言，属局部更替型，其特点为不限于吸收根而是全部细侧根参与更替。

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It is well known that the developmental inherent rhythm occurs during the development of secondary vascular tissue. Synchronously, the cell ergastic substance shows dynamic changes.

众所周知，树木次生维管组织的发育具有内在的节律性，与此同时维管组织的细胞内含物也会发生动态变化。

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