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草业学报  2014 

宁夏中部干旱带主要植物叶性状变异特征研究

DOI: 10.11686/cyxb20140106, PP. 41-49

Keywords: 叶性状,变异特征,科类群,功能类群,宁夏中部干旱带

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Abstract:

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。

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