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观察苹果树不同枝龄的树皮切片，发现未曾形成落皮层的部位树皮韧皮纤维束的层数和枝龄是一致的，为观察树皮组织结构变化，提供了发育解剖学依据。探明在树皮衰老过程中，新周皮下面树皮组织中韧皮射线外端开始弯曲和结构消失的年份与树体发生腐烂病的轻重存在明显的相关性，经统计分析，提出了“壮树”的初步标准，经检查验证，结果一致。试验证明，对衰老部位的树皮人为更新，可取得防病保树的效果。
The observation of the bark slices of apple trees with different branches showed that the number of bark barks and the branches of the bark were the same for those parts of the bark that had not formed the cortex and provided the anatomic basis for the observation of the bark tissue structure changes. The results showed that there was a significant correlation between the year of tree bark decay and the beginning of the bending and disappearance of the structure of the phloem in the bark tissue under the new periderm during the process of the bark aging. According to the statistical analysis, Strong tree "preliminary standards, verified by inspection, the results are consistent. Experiments show that the bark of the aging parts of the man-made updates, can get the effect of disease prevention and tree protection.