龙眼树干、枝、叶、果实空间分布格局研究

Distribution patterns of trunks,branches,leaves and fruits in Dimocarpous longana.

选择 6年生早结丰产龙眼植株 ,采用分层调查法对名优品种储良龙眼树体结构特别是树冠上枝、叶、果实的分布格局及其相互关系进行了分析研究 .结果表明 ,主干较矮 ,树冠为自然半圆头形 ,冠幅略大于冠厚 .主枝 4或 5条 ,主枝与各级分枝在树冠空间上分布较均匀 .枝梢、结果母枝和果实比较均匀地分布在平行于主干的纵向各行上 ,在垂直于主干方向上 ,则以中部各冠层所占比重较大 .绿叶层较厚 ,且和果实均匀分布于树冠表层 .果实主要集中在中部距冠底 6 0～ 15 0cm的冠层上 ,占总产量的 78.9%.各冠层中的枝梢、结果枝、果实粒数、果实产量之间存在显著线性相关关系 .

The distribution patterns and relationship of branches,leaves and fruits in the canopy of 6 years old typical engrafted(Dimocarpous longana) were investigated with stratification method.Result shows that the trunk was short and the canopy shaped as the natural semicircle.There were 4 or 5 main long branches in most trees.The long branches uniformly distributed in the canopy.The short branches,fruit-bearing branches and fruits uniformly distributed in the longitudinal rows paralleled the main branch.In the direction being vertical main branch,the short branches,the fruit-bearing branches and fruits uniformly distributed in the central section of canopy.Green leaves and fruits uniformly distributed on canopy surface.The fruits mainly distributed in the canopy from central to 60～150 cm layer of the canopy bottom,accounting for 78.9% of total fruits.The number of branches,fruit-bearing branches and number of fruits as well as the yield in different canopy layers was significantly linearly correlated.