十余年来对腾冲县古永林场云南松母树林营建技术措施的试验研究表明：疏伐对林分母树树冠的生长发育具有明显的促进作用，随着疏伐强度的加大，林木树冠的增长也随之增加，而枝下高能保持相对稳定，由于结实层的增加，以及光、热、水、肥等环境条件的改善，提高了母树的结实量，从而降低了种子采集成本。在参试的几种疏伐强度中以保留郁闭度0.3处理的效果最好，其1993～1995年的每公顷年平均结实量、年平均单株结实量和结实株率分别达10 329个、60个和95.65%，超出对照25.81%、408.47％和15.37％。故对改建16年生左右的云南松天然优良林分为母树林，宜选用03（郁闭度）疏伐强度的技术措施，母树林经2次疏伐后即可定型,其疏伐间隔期不超过4年。 More than ten years on the Tengchong County Yong Farm Yongning pine planted in the experimental study shows that: the thinning on the growth of the parent tree canopy growth and development have obvious role in promoting, with the increase of thinning strength, the growth of tree canopy But also increased. However, the high energy of the branches remained relatively stable, and the increase of the stratum corneum and the improvement of the environmental conditions such as light, heat, water and fertilizer increased the stubbornness of the tree and the cost of seed collection. Among the tested varieties of thinning intensity, the treatment with preserving canopy density 0.3 had the best effect. The average annual per hectare, the average annual per plant yield and the number of stubble plants in 1993-1995 were 10 329 , 60 and 95.65% respectively, exceeding the control by 25.81%, 408.47% and 15.37%. Therefore, about 16-year-old rehabilitated natural Pinus yunnanensis forest is divided into the mother forest, should choose 0  3 (canopy density) thinning strength of the technical measures, the parent tree after two thinning can be shaped, the thinning interval Not more than 4 years.