Abstract: In order to investigate the effect of leaf anatomic structures on drought tolerance in different shrub species of Daqing Mountains, five shrub species including Ostryopsis davidiana, Clematis fruticosa, Amygdalus pedunculata, Rhamnus parvifolia and Rosa xanthina were selected from the sunny slope of Daqing Mountains, Inner Mongolia. Paraffin sectioning technique and microscopy were used to dissect 13 leaf anatomic structure characteristics including leaf thickness, cuticle thickness, and epicuticle thickness, etc. to evaluate their drought tolerance via the membership function. The results showed that leaf thickness of C. fruticosa (319.30 μm) and leaf cuticle thickness of R. parvifolia (5.06 μm) were higher than those of the other three species. The thickness of spongy tissue (45.99 μm) and the looseness of leaf tissue structure (32.89%) of R. xanthina were the lowest. The major veins width (244.58 μm) and xylem area (3 662.03 μm2) were the highest in O. davidiana. The diameter of vessel element in C. fruticosa (9.66 μm) and the R. parvifolia (9.24 μm) were larger than those of the other species. According to the analysis of membership function, drought tolerance of five plant species was ranked as: O. davidiana (0.64)>C. fruticosa (0.56)>R. parvifolia (0.51)>A. pedunculata (0.46)>R. xanthina (0.36). The results of present research  provided anatomical basis for interpreting drought tolerance of plant in Daqing Mountains.

Key words: Daqing Mountains, sunny slope, shrub, leaf, anatomic structure, drought tolerance

摘要： 为了研究大青山阳坡几种常见植物叶片结构对树种抗旱性的影响，以内蒙古大青山阳坡优势植物虎榛子（Ostryopsis davidiana）、灌木铁线莲（Clematis fruticosa）、柄扁桃（Amygdalus pedunculata）、小叶鼠李（Rhamnus parvifolia）、黄刺玫（Rosa xanthina）5种旱生灌木为研究对象，通过石蜡切片技术，利用光学显微镜测定不同植物叶片厚度、角质层厚度、上表皮厚度等13个叶片抗旱性解剖结构指标。通过隶属函数法，采用叶片厚度、角质层厚度、栅栏组织厚度、海绵组织厚度、主脉宽度、木质部面积6个指标对各植物的抗旱性进行分析与评价。结果表明：①灌木铁线莲的叶片厚度（319.30 μm）和小叶鼠李（5.06 μm）的角质层厚度较高。②黄刺玫的海绵组织厚度（45.99 μm）和叶片组织结构疏松度（32.89%）最低。③虎榛子主脉宽度（244.58 μm）和木质部面积（3 662.03 μm2）最高，而灌木铁线莲（9.66 μm）、小叶鼠李（9.24 μm）导管孔径较大。④根据隶属函数值得出5种植物抗旱性排序为：虎榛子（0.64）＞灌木铁线莲（0.56）＞小叶鼠李（0.51）＞柄扁桃（0.46）＞黄刺玫（0.36）。结果可为大青山阳坡植物抗旱机制研究提供解剖学依据。

关键词: 大青山, 阳坡, 灌木, 叶片, 解剖结构, 抗旱性