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１９８７年采集２３８个杉木二代种子园自由受粉家系，进行子代测定。８年生结果显示，杉木二代种子园中各家系间生长性状存在显著遗传差异。从中选择优良家系进行造林，生长量能比杉木二代种子园子代平均表现增加６％，比杉木一代种子园最优无性系增产２０％以上。
In 1987 238 Chinese fir second-generation seed orchards were randomly pollinated and tested for offspring. The results of 8-year-old showed that there were significant genetic differences among the growth traits of the second generation seed orchard in Chinese fir. From the selection of excellent families for afforestation, the growth of seedlings than the second generation of Chinese fir seedlings on behalf of the average performance increased by 6% than the first generation of Chinese fir seed clonal yield more than 20%.