思茅松无性系种子园花期观察初报

Blooming characteristics in clones seed orchard of Pinus kesiya var.langbianensis

通过对思茅松种子园16个无性系花期观察,结果表明:①球花在开放过程中有明显的外部形态特征和颜色变化,单个雄球花序和整个雄球花序簇开放是从基部至顶部;雌球花开放是由花顶部至基部开放,闭合时顺序相反。②不同无性系间雌雄球花期起止时间和持续时间存在一定的差异;多数无性系内散粉期与授粉期具有同步性,散粉期包含于授粉期内。③同一无性系内不同分株间花期同步性较好。④同一植株不同方位花期差异不明显,而不同层次雌球花有一定的差异,雄球花差异不大。

The strobili blooming in clone seed orchard of Pinus kesiya var. langbianensis in Puwen Experimental Forestry Farm were studied. The results showed that： ① Strobili showed different appearances and colors in the different blooming periods. The male strobili opened from base to top and female strobili disparked from top to base. ② There were great differences in the average blooming phenology among clones. The female strobili opened earher, and ended later than male strobili within most clones, and the eeeptivlty of female strobili lasted for a longer time than shedding of male strobili. ③ The blooming time showed 1 - 2 days difference for different ramets within clones. ④ There were no difference blooming facing four directions and slight difference in three crown levels, and the female strobili opened earlier in the low part than the upper part, and the male strobili had no difference in the different parts.