不同配置城市防护绿地中胡杨构型特征

Response of branching architectures characteristics of Populus euphratica in different collocation in shelterbelts

应用枝系构型理论,研究了胡杨在克拉玛依市防护林中的分枝构型的特征,并重点针对3种配置类型:胡杨(Populus euphratica Oliv.)×沙枣(Elaeagnus angustifolia L.)、胡杨×银白杨(Populus alba L.)和胡杨×白榆(Ulmus pumila L.),分析了胡杨分枝构型在不同配置中的变化。结果表明:防护绿地中胡杨不同部位(树冠)构型格局中,各级分枝长度数值和各级分枝角度数值从上到下均表现为逐渐变大的趋势;不同配置类型对胡杨构型特征(主要表现在分枝角度和分枝长度两个指标)的影响存在显著差异,影响力大小依次为胡杨×银白杨、胡杨×白榆、胡杨×沙枣。

The major factors that influence the branching archtectures of plants comprise branch length,branching angle at different branching levels,branch - stem ratio,stepwise bifurcation ratio and overall bifurcation ratio,etc. The branching architecture characters of Populus euphratica in some different shelterbelt types were researched by using the Branching Architecture theory. This research aims to give some basic information on the forest,including the branching architecture characters of Populus euphratica. The results indicated that：①The branch length,branching angle of all type change regularly . The branch length is gradually become big from upper to low,so does branching angle. ②The research results showed that the effect of typeⅢ is better,typeⅠ and typeⅣ are middle ,and type Ⅱ is relatively inferior. The poplar is fast - growing,it is bad for Populus euphratica. Since the distance between trees should be considered. At the same time choose appropriate species is important.