中文摘要：

以宁夏中部干旱带35种植物9种叶性状为研究对象,分析其变异特征、相关性以及不同科、功能类群间的关系,探讨该地区植物对环境的适应性,为该地区生态系统植被的恢复和重建提供理论依据.结果表明,叶性状特征存在种间差异,按照变异系数,可划分为3类：高变异系数（叶片厚度和叶片单位面积吸水量）、中变异系数（叶片含水量增加率、叶组织密度、叶片肉质化程度和比叶面积）和低变异系数（叶绿素含量、叶片干物质含量和叶片水分饱和亏）.一年生植物叶组织密度、叶绿素含量和叶片干物质含量的平均值极显著低于多年生植物,而比叶面积则极显著的高于多年生植物.叶组织密度、叶片厚度、叶片肉质化程度、叶片干物质含量和叶片单位面积吸水量在不同科类群之间存在极显著差异,而比叶面积、叶片水分饱和亏、叶绿素含量和叶片含水量增加率之间则差异不显著.因此,可以将叶组织密度、叶片厚度、叶片肉质化程度、叶片干物质含量和叶片单位面积吸水量用作不同科类群植物间相比较的研究因子.

英文摘要：

The variations,associations,relationships of different family groups and functional class groups of nine leaf traits from 35 plants of Ningxia,Northwest China were studied,to assess the adaptation of the 35 plants to their environment and to provide a scientific basis for discussion of restoration and reconstruction of arid region ecosystems.There were differences of leaf traits between the species,and according to the coefficient of variation,the nine leaf traits can be divided into three categories：high coefficient of variation （leaf thickness and leaf water uptake content）,moderate coefficient of variation （percentage increase in leaf water content,leaf density,leaf succulence and specific leaf area）,low coefficient of variation （chlorophyll content,leaf dry matter content and leaf water saturation deficit）.The averages of leaf density,chlorophyll content and leaf dry matter content in annuals were highly significantly （P＜0.01） lower than those in perennials,but the averages of specific leaf area in annuals was highly significantly （P＜0.01） more than that in perennials.There were highly significant （P＜0.01） differences in leaf density,leaf thickness,leaf succulence,leaf dry matter content and leaf water uptake content among the different family groups but there were no significant differences in specific leaf area,water saturation deficit,chlorophyll content and leaf water content.Leaf density,leaf thickness,leaf succulence,leaf dry matter content and leaf water uptake content could be the better traits for studying leaves in the different family groups.