贡嘎山阔叶木本植物叶片解剖结构及其生存策略分析

An Analysis of the Foliar Anatomical Structures of Broadleaved Woody Plants in the Gongga Mountains and Their Survival Strategy

对68种贡嘎山阔叶木本植物的叶片解剖结构特征进行了研究,结果表明:1叶片各解剖结构在不同物种间存在很大的差异,其中海绵组织厚度和栅海比的变异系数较大,是生态适应性状;而叶片厚度、上表皮厚度、栅栏组织厚度以及栅栏细胞层数的变异系数较小,是系统演替性状.2落叶植物有较大的光合速率,而对叶片组织结构的投入较低,采取了积极型的生存策略;常绿植物具有较小的光合速率,并对叶片组织结构有较高的投入,采取了保守型的生存策略.

In a study reported in the present paper ,the leaf structural characters of 68 broadleaved woody species of the Gongga Mountains were investigated .The results were as follows :① Great interspecific differences were observed in various anatomical structures .Sponge tissue thickness and palisade spongy ra-tio had larger coefficient of variation (CV) ,suggesting that they were ecologically adaptive traits ,while blade thickness ,upper epidermis thickness ,palisade tissue thickness and palisade cell layers had smaller CV ,indicating that they were system succession traits .② Deciduous plants had higher photosynthetic rate and lower investment in leaf tissue structures ,which was a positive survival strategy ;while evergreen plants had lower photosynthetic rate and higher investment in the organizational structures of blades , w hich suggested that they adopted a conservative strategy for survival .