摘要
油松雌、雄球花在各级侧枝上的分布状况不同,母树开花结实能力变异很大。据此可将其划分为偏雌型、偏雄型、中性型和营养型等四个类型;花期早晚和球花所在方向、部位有关。还研究了球果在各枝轮及各级侧枝上的分布状况。
The distribution of female cones differs from that of male cones on the branch stem of different classes of Chinese pine. The flowering-fruiting capability is closely linked to the characteristics of the seed tree, and can be divided into four types, partial female type; partial male type, neutral type and nutritional type. The time of flowering correlates to the direction and position of the cone on the seed tree. We discuss the distribution of cones on branch stem and branch whorl.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
1992年第1期34-38,共5页
Journal of Beijing Forestry University
关键词
油松
开花
结实
雌球花
Pinus tabulaeformis Carr., female cone, male cone, flowering, fruiting
