根据杉木树冠各部位的年龄大小，将杉木树冠划分为若干年龄段。通过对各年龄段♀、♂球花（果）数的调查分析，结果表明：杉木种子园中各无性系♀、♂球花（果）数以及座果率的差异都极其显著，而且低产无性系占一半以上；不同年龄段上的♀、♂球花（果）数的差异也达到极其显著水平并呈规律性变化，但各年龄段的座果率基本一致。 According to the age of all parts of the canopy of fir, the fir canopy is divided into several age groups. The results showed that there were significant differences in the numbers of poplar, fruit ball and fruit set among all the clones in Chinese fir seed orchard, and the low productive asexuality Accounting for more than half of them. The differences in the numbers of spurge and spiders in different age groups also reached extremely significant levels and showed regular changes, but the fruit-setting rates of all ages were basically the same.