大屏嶂森林公园次生常绿阔叶林树木的构筑型特征分析

文章采用网格取样技术结合线路调查法，在大屏嶂森林公园次生常绿阔叶林内设置9个样地，对样地内共26个树种的乔木立木进行调查，并且初步分析构筑型特征。研究结果显示：（1）树木冠形主要有卵形、圆球形、圆柱形、伞形和圆锥形5种基本类型，以圆球形冠形的树木种类比例最高，占统计总数的30％；（2）乔木冠幅多数属于中冠幅类型，并存在较小的分枝角度，其中以45°的比例最高，达到30．8％，其次是30°，占23．1％；（3）树木的分枝级数最大为7级，而以4级分枝的树种最多，占统计总数的38．5％；（4）树高与枝下高以及胸径的关系均符合幂函数关系，并且均呈正相关。

Architecture Characteristics of Tree Species in Secondary Evergreen Broad-leaved Forest of Dapingzhang Forest Park

Based on investigations of 26 tree species in 9 plots of secondary evergreen broad-leaved forest in Dapingzhang Forest Park,this paper primarily analyzed architecture characteristics of trees through the methods of grid sampling technique and route surveys in the field.The results showed that:(1)There are five basic types of crown profile:oval,spherical,cylindrical,umbellate and circular.The proportion of tree species with spherical crown is the highest,accounting for 30% of the total;(2)The majority of trees belong to the medium-sized crown type,and there is a small branching angle.The 45°consistitutes the highest proportion,whish is 30.8%, followed by 30°,accounting for 23.1%;(3)The maximum number of branches was seven,while that of branches with four branches was the largest,accounting for 38.5% of the total;(4)The relationship between tree height and under-branch height,tree height and DBH was in the power function,and all of them had positive correlation.