中文摘要：

采用生态解剖学的方法对玉龙雪山自然保护区内不同海拔梯度（3 100 m,3 250 m,3 400 m,3 550 m,3 700 m）的急尖长苞冷杉叶片解剖结构特征进行比较研究,探究不同海拔高度对急尖长苞冷杉叶片生态适应的影响。结果表明：在海拔低于3 550 m时,随着海拔的升高,叶片表皮角质层厚度、上表皮厚度、栅栏组织厚度、海绵组织厚度、栅栏组织细胞长短径、栅栏系数、栅栏细胞系数、韧皮部厚度、木质部厚度及转输组织厚度均呈增大趋势,而海拔高于3 550 m时,各项指标及参数有所下降。因此,海拔3 550 m附近为玉龙雪山急尖长苞冷杉生长最适宜的环境;不同海拔梯度上复杂的环境条件导致了急尖长苞冷杉叶片解剖结构的差异性,并限制了它的生长和分布。这种差异性是植物在一定程度上适应环境的结果。

英文摘要：

To study the ecological adaptation of Abies georgei var.Smithii leaves at different gradient elevations ,the leaf anatomical characteristics of Abies georgei var.Smithii and their relationship with ecological factors were investigated,which are growing at different elevations （3 100 m,3 250 m,3 400 m,3 550 m,3 700 m） in the Nature Reserve of Yulong Snow Mountain.The results showed that ：at the altitude below 3 550 m,the strata corneum epidermidis thickness, upper epidermis thickness, palisade mesophyll thickness, spongy mesophyll thickness,length and width of palisade cell, palisade tissue ratio, palisade cell factor, phloem thickness, xylem thickness and the transfusion tissue thickness increased with the increasing elevation. However, the parameters of leaf anatomical characteristics decreased at the elevation above 3 550 m. Hence, the optimum zone for Abies georgei var.Smithii was nearly at the elevation of around 3 550 m. On one hand, the growth and distribution of Abies georgei var.Smithii are limited by the changes of complex environmental conditions along with different altitudes, which resulted in the differences of the leaf anatomical characteristics of Abies georgei var.Smithii.On the other hand,these differences of the plant could lead to a good adaptation to the environment changes in a certain degree