不同生境中辽东栎的构型差异

THE ARCHITECTURAL VARIATION OF Quercus liaotungensis IN DIFFERENT HABITATS

辽东栎具有很强的萌生能力，在东灵山地区，存在于多种林分中。对生活在落叶阔叶混交林和次生落叶阔叶灌丛中辽东栎植株（树高６～８ｍ）的构型进行了比较统计分析，结果表明不同生境中的辽东栎构型具有较大差异。具体表现在：（１）混交林中的辽东栎个体多生活在林隙中，同灌丛中的个体相比，树冠窄小，枝倾角较大，第一枝级枝条（上层）较长，但分枝率较小，叶面积指数较低。（２）枝、叶的方位角，叶倾角（上层）在不同生境中未发生显著变化。因此，叶的空间位置主要由枝长、枝倾角等参数决定。另外，不同生境中的辽东栎个体的分枝率、枝长和枝倾角等性状都发生了显著变化。

Quercus liaotungensis has high potency to resprout,and can live in several kinds of forests in Dongling Mountain regions.Comparative analyses was made on the architecture of Q.liaotungensis in mixed deciduous broad leaved forest and secondary deciduous broad leaved shrubs.The result indicates that there is a great architectural variation between the individuals of the two habitats.It is shown concretely as follows.Most of the individuals in the mixed forest live in small forest gaps.They have thinner and more narrow crowns with longer branch of order 1 in upper layer,wider branch angle to horizon,lower bifurcation ratio and leaf area index( LAI ),in comparison with those in scrubs.The azimuthes of branch and leaf and leaf angle to horizon are not different significantly,and it indicates that the leaf position is determined mainly by the branch length and angle.In the two different habitats,bifurcation ratio,branch length and branch angle to horizon all vary significantly.It suggests that there is an ecological correlation among them.