华山松种子园无性系开花习性研究

云南楚雄华山松种子园的无性系,其雌球花着生在树冠外围枝条,而雄球花主要着生在树冠的内膛枝条。在水平方向上,雌球花多着生在树冠南部,雄球花的分布比较均衡;在垂直方向上,雄球花基本分布在树冠的中下部,雌球花则分布在树冠的中上部。大多数无性系的雄球花散粉期比雌花可授期早2~4 d;不同无性系间的雌雄花期具有一定的同步性。各无性系间雌、雄球花数量存在极显著差异,且有明显的偏雌或偏雄特性。雄球花量与无性系生长性状间存在显著正相关,雌球花量与树体生长相关性不显著。

Blooming characeristics in clonal seed orchard of Pinus armandii

The strobili blooming in clone seed orchard of Pinus armandii in Chuxiong Yunnan province were studied.The results were as follows.There were great differences in the average blooming phenology among clones.The male strobili opened earlier 2-4 days.There were significant differences of flower yield among clones.Pinus armandii had different female and male tendency.Female and male strobili spatial distribution within crowns was different.Most of female strobili were on the outer side of the crown,while the male strobili were mainly on weak branches inside of the crown.Horizontally,male strobili had a balanced distribution on four directions of crown,while female ones were in the south rather than in the west.Vertically,male strobili mainly scattered over the middle-lower part of crowns,while the female strobili were mostly in the middle-upper part.The production of male strobili had a significant correlation with the growth of plant,but it was not that of female.