山西濒危植物翅果油树植冠的构型分析

Architectural analysis of crown geometry of endangered plant Elaeagnus mollis in Shanxi Province

应用分形理论及方法,从分枝格局和冠幅扩展2个方面对山西翼城和乡宁的35株翅果油树(Elaeagnus mollis Diels)个体的植冠构型进行统计分析。结果表明,幼树和成树的总体分枝率和逐步分枝率有显著变化;一级枝的平均枝长和枝径有显著差异,但枝和叶的方位角及叶倾角差异不明显。不同发育阶段个体的冠幅变化较大,幼树冠幅的分形维数(2.0026)小于成树(2.2694)。翅果油树在不同生长发育阶段对生境变化有不同的构型策略。

Architectural analysis of thirty-five individuals of Elaeagnus mollis Diels in Yicheng and Xiangning of Shanxi Province was carried out by Fractal Theory from branching pattern and crown range. The results showed that there were obvious changes in overal bifurcation ratio and stepwise bifurcation ratio and there were significant differences in average length and collar diameter of first order branches, but not obvious differences in branch azimuth, leaf azimuth and angle of leaf to horizon between saplings and bearing trees. Moreover, E. mollis unfolded larger differences in crown range at different development stages. The fractal dimensions of saplings were 2. 002 6, which smaller than 2. 269 4 of beating trees. It is suggested that E. mollis possessed different strategies of architecture at different development stages to deal with varied habitats.