结果树龄增长，生物碱含量下降；
Results: With the growth of the tree, its alkaloids content decreases.
结果显示，树龄与苹果树腐烂病的发生直接相关，表现为随着树龄的增加腐烂病危害逐渐加重。
The result shows that there is a close relation between the age of the apple tree and the disease index.
结果显示，树龄与苹果树腐烂病的发生直接相关，表现为随着树龄的增加腐烂病危害逐渐加重。
The result shows that there is a close relation between the age of the apple tree and the disease index.
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