科尔沁沙地东南部地区主要植物叶片性状及其相互关系

选取科尔沁沙地东南部地区23种主要植物,将其划分成草本、灌木和乔木3种生长型,并分别测定其叶片鲜重(FW)、干重(DW)、叶干物质含量(DMC)、面积(AR)、比叶面积(SLA)和厚度(TH)等6项叶片性状因子。结果表明,草本植物的叶片性状比灌木和乔木变异大;平均SLA和DMC草本<灌木<乔木,DW反之,而TH则没有明显的变化。方差分析发现,除DW和TH外,SLA和DMC在不同生长型中的变化显著,并且SLA与DMC呈显著负相关,说明SLA和DMC是在植物资源利用分类轴上划分植物种类的最佳变量。对于厚度,还需进一步进行研究。

Leaf traits and their interrelationships of main plant species in southeast Horqin sandy land

In this paper,23 main plant species of herb,shrub and tree were sampled from southeast Horqin sandy land,and their leaf traits including fresh weight(FW),dry weight(DW),dry matter content(DMC),area(AR),specific leaf area(SLA) and thickness(TH) were measured.The results showed that the leaf traits of herb were more variable than those of shrub and tree.The average SLA and DMC were in the order of herb < shrub < tree,DW was in reverse,while no apparent change was found in TH.A significant variation in leaf SLA and DMC was observed among herb,shrub and tree,and there was a significant correlation between these two indices,suggesting that SLA and DMC could be used to predict the plant species position along a resource use gradient.In case of leaf thickness,some variability could not be explained in this study,and thus,further studies should be focused on this leaf trait.