4个花苜蓿居群叶片解剖结构特征及其可塑性对不同水分处理的响应

对经过3种水分处理的4个花苜蓿居群（内蒙古科右中旗、克什克腾旗、陕西南泥湾和甘肃兴隆山）叶片解剖结构特征及它们的可塑性进行了研究。结果表明：除上下表皮细胞厚度外，土壤水分处理对花苜蓿的叶片解剖结构有着显著影响。随着水分减少，大部分花苜蓿居群栅栏组织厚度增加，海绵组织厚度相应减小，叶片厚度增大，叶片组织结构紧密度增加，疏松度减少，叶脉突起度增加。10个解剖指标中，栅栏组织海绵组织厚度比的可塑性指数最大，上表皮细胞厚度次之，叶片厚度最小。4个花苜蓿居群可塑性指数平均值大小排序为：科右中旗〉克什克腾旗〉南泥湾〉兴隆山。综合方差分析和Ducan多重比较，可推测：花苜蓿的抗旱性与其分布的地域有关，分布于典型草原地带的科右中旗和克什克腾旗2个居群的花苜蓿的叶片结构可塑性要较分布于森林草原地带的南泥湾居群和兴隆山居群大。。上述结果有助于了解花苜蓿的生态适应特点，同时也为筛选适应北方干旱、半干旱地区的优良豆科牧草资源提供依据。

Response of Leaf Anatomy Characteristics and Its Plasticity to Different Soil-water Conditions of Medicago ruthenica in Four Populations

Leaf anatomy characteristics and plasticity of Medicago ruthenica from four populations(Keyouzhongqi and Keshiketengqi,Inner Mongolia;Nanniwan,Shaanxi and Xinglong Mountain,Gansu)treated by different water conditions(dry,moderately dry and wet) were surveyed.Results show that: the soil-water conditions had a significant effect on leaf anatomy characteristics except the wall thickness of the upper and lower epidermis cells.In most populations,palisade tissue thickness,leaf thickness,cell tense ratio,vein pro...