银杏枝、花、种子在树冠上的分布格局及其相互关系研究

Distribution patterns of shoots,flowers and seeds in Ginkgo biloba canopy and their relationships

采用分层调查的方法研究了 14年生银杏嫁接植株树冠上枝、花、种子的分布格局及其相互关系 .结果表明 ,长枝、短枝、短果枝和花主要分布在树冠中部 ,且分布比较均匀 .树冠上从上到下 ,长枝平均年龄逐渐增大 ,分枝角度逐渐升高 .种子主要集中分布在距地面 180～ 3 2 0cm的体积冠层中 ,这一冠层中的种子数占植株种子总数的 5 1.3 % .不同冠层中枝、花。

The distribution patterns of shoots, flowers and seeds in the canopy of 14 years old engrafted Ginkgo biloba and their relationships were investigated with stratification method.The result shows that long shoots,short shoots,bearing shoots and flowers uniformly distributed in the central section of canopy.From the top to the bottom, the average age and the divaricating angle of long shoots increase 51.3% of the seeds distributed in 180～320cm layer from the ground.The number of shoots, flowers and seeds in different canopy layers was closely correlated.