Amorpha fruiticosa is a soil conservation species. The research aimed to investigate the changes in morphological and anatomical characteristics of two-year seedling leaves of A. fruticosa under the different drought stress gradient:light stress(LS), medium stress(MS)and severe stress(SS). The results showed that the thickness of blade and the upper and lower epidermis were gradually decreased with the increase of drought stress gradient. Thickness of palisade tissue and spongy parenchyma were also decreased,while, the ratio of palisade tissue to spongy parenchyma, the relative diameter of the vascular bundle in main vein, the protruding degree of main vein and midrib thickness were increased. The stoma area was a downtrend but its density was increased. Furthermore,with the drought stress increased, the leaf size was decreased and its shape was changed. These results indicated that A. fruticosa could change the morphological and anatomical structure of its leaves to adapt the drought stress.%研究了重度、中度、轻度干旱胁迫条件下2年生紫穗槐幼苗叶片的形态解剖学特征变化.结果表明:随着干旱胁迫程度的增加,叶片厚度、上下表皮的厚度逐渐减小,栅栏组织和海绵组织的厚度也减小,而栅栏组织与海绵组织的比值、主脉维管束相对直径、主脉突起度与中脉厚度则增大.气孔面积随干旱程度的增加呈下降趋势,但气孔分布的密度增加.在干旱逆境胁迫条件下,紫穗槐通过改变叶片外部形态、内部解剖构造和生理功能来适应干旱环境.
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