油松种子园促花结实技术研究

Technique of Promoting Flower and Seed Setting Rate in Pinus tabulaeformis Seed Orchard

通过对油松种子园进行截顶疏枝、施肥等试验,结果表明:处理后的各无性系胸径平均增长16.3%,冠幅平均增大36.3%,球果数平均增长为65.1%,油松母树的雌球花量和种子的产量有明显的提高;油松种子园母树的定干高度为4m,截顶疏枝后的油松种子园母树的郁闭度应在0.25~0.40。

Experiments of truncation and branch thinning on Pinus tabulaeformis in its seed orchard were conduc-ted. Result shows that the average DBH of the clones increase by 16. 3% , the average crown height increase by 36. 3% and the average number of fruit trees increase by 65. The amount of female autumn flowers and theyield of seeds of Pinus tabulaeformis were significantly improved. The cut height of Pinus tabulaeformis seed tree is 4 m, and the canopy density of Pinus tabulaeformis seedling should be 0. 25 - 0. 40 after being truncated.