日本落叶松种子园优良家系球花分布规律及花量调查

Studies on the Distributions of Flowers in Seed Orchard of Larix kaempferi

摘要:

摘要：对日本落叶松种子园优良家系雌雄球花数量及在树冠上的分布规律进行调查分析。结果表明：日本落叶松雄球花在树冠垂直方向上分布差异极显著，下层和中层的数量显著多于上层，所占比例为83.39%，水平方向上南面的雄球花多于其他方向；雌球花在树冠不同冠层的分布无显著差异，中、上层的雌球花数量比下层多，东、南方向多于西、北方向；雄球花多着生在2，3 a生枝上，雌球花多着生在3，4 a生枝上，1 a生枝条上无花；不同无性系间雌雄球花数量差异显著，356号无性系的雌雄球花数量均为最多。

Abstract:

Abstracts:The distribution and quantity of flowers in trees crown in Larix kaempferi seed orchard were investigated and analyzed. The results showed that there was significant difference in the distribution of male cones between vertical layers, and the quantity of male cone in lower layer and middle layer accounting for 83.39% of the total were larger than that of upper layer; the quantity of male cones in southern part was the largest in all horizontal direction. It also showed that the female cones were distributed mostly at the upper part and middle part of crown, and the southern part yielded the most female cone. However, the difference in the distribution of female cones in the varied parts of crown was non-significant, whether between the vertical layers or the horizontal parts. The oneyearold branches of Larix Kaempferi did not produce cones in general, and there were only male cones in twoyearold branches. There were both male and female cones in threefive years old branches. Most of female cones growed in branches of three and four years. Nevertheless, the male cones comed into being in branches of two and three years. There was significant difference in the quantity of female cones and male cones.In general,number 356 yielded more cones than others.