华山松嫁接种子园的郁闭度为０６以上时，即可进行第一次疏伐。疏伐强度采用无性系平均胸径、树高和冠幅估算。去劣疏伐时，依据子代测定结果、开花结实量、花期同步性和母树生长势选择优良无性系和优良母树。疏伐试验结果表明，无性系生长量、开花结实量都有显著的增加。 Huashan pine grafted seed orchard canopy density of 0  6 or more, you can carry out the first thinning. The thinning intensity was estimated using the average DBH, tree height and crown of clones. To the poor sparse, based on the results measured offspring, flowering and fruiting, flowering synchronization and growth of the mother tree selection of excellent clones and good parent tree. The results of thinning experiments showed that the growth of clones and the flowering of seedlings were significantly increased.