云南松母树林种子产量质量与郁闭度的研究

本文总结了在永仁县白马河林场八年来的试验,从实践中分析云南松母树林种子的产量、质量与母树林保留郁闭度的关系,从中得出结论,要提高云南松母树林种子的产量和质量,对选择出来的云南松优良林分进行疏伐改造是重要的手段,母树林的郁闭度保留在0.4时,种子的产量最高,是对照林分的2.53倍,是0.5郁闭度林分的1.49倍,是0.6郁闭度林分的1.86倍,郁闭度保留在0.4时,种子的质量也最好,此时对母树的树体发育也最有利。这套云南松母树林的疏伐管理方法可提供给林业部门推广使用。

A STUDY ON RELATIONSHIP BETWEEN SEED OUTPUT,AND ITS QUALITY AND CANOPY DENSITY OF SEED STAND OF PINUS YUNNANENSIS

This paper analyses the relationship between the seed output,and quality of seed stand of Pinus yunnanensis and the capony density of seed stand through an eight-year experiment on Baima River Forest Farm.The experiment result showed that it was an important method to improve the seed output and quality of seed stand of Pinus yunnanensis by means of thinning and transforming the selected elite stand of Pinus yunnanensis.When the canopy density of seed stand remained 0.4,the seed output which was the best harvest was 2.53 times as much as the contrast stand,1.48 times as much as that of 0.5,and 1.86 times as much as that of 0.6 in canopy density.Meanwhile,the seed quality of the first kind was also the best.In this case, the condition was most beneficial to tree growth of seed stand.This set of methods in thin- ning management of seed stand of Pinus yunnanensis is worth introducing to the Forestry Department for wide application.