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母树林结实量受控于树冠体积,而树冠发育状况为林分郁闭度所制约。单株结实量还与立木个体的生殖生长特性,生长发育状况(生长级)有关。疏伐是改建云南松母树林的关键技术措施,它对于促进母树树冠发育,提高单株及单位面积结实量具有明显的效应。试验研究表明,采用疏伐措施控制母树林分的郁闭度为0.3,可使单株及单位面积的结实量达高水平。
The stand density of parent tree is controlled by the crown volume, while the crown development status is restricted by stand density. Solid per plant also with reproductive growth characteristics of individuals stand, growth and development (growth level). Thinning is the key technical measure to rebuild the pine woodland of Yunnan, which has obvious effect on promoting the crown development of the female tree and improving the unit weight per unit area. Experimental studies have shown that the use of thinning measures to control the canopy density of 0.3 for the canopy density can make the unit and unit area of the high level of solid.