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将3个杉木无性系的一年生扦插苗分成5个等级进行造林试验，成活率均在95％以上。造林后4年，无性系间胸径生长差异极显著，Ⅰ～Ⅲ级苗的树高、胸径均显著或极显著超过Ⅳ、Ⅴ级苗，并提早一年郁闭成林，可节省一年的抚育投资。因此，采用壮苗加上优良无性系造林，能显著促进幼林生长，取得更大的增产效果。
The annual cuttings of three Chinese fir clones were divided into five grades for afforestation experiment, with the survival rates above 95%. After 4 years of afforestation, there was significant difference in DBH growth among clones. The tree height and DBH of Grade Ⅰ ~ Ⅲ seedlings all significantly or extremely significantly exceeded Grade Ⅳ and Grade Ⅴ seedlings and could be closed one year earlier and could save one year Tending investment. Therefore, the use of strong seedlings plus excellent clonal afforestation can significantly promote the growth of young forests and achieve greater yield increase.