甘肃崆峒山不同海拔辽东栎叶特性研究.docVIP

  甘肃崆峒山不同海拔辽东栎叶特性研究# 李琪佳，陈稳兴，王茂江，丁素婷，孙柏年，吴靖宇** （兰州大学地质科学与矿产资源学院，兰州 730000） 5 10 摘要：通过对甘肃崆峒山不同海拔尺度上的辽东栎(Quercus liaotungensis Koidz.)叶片比 叶面积、气孔长度、气孔密度和毛基密度进行测定来探索海拔变化对崆峒山辽东栎生理形态 的影响以及叶片解剖学特性对海拔梯度的适应性，从而为选择化石植物重建古环境提供依 据。数据分析显示比叶面积、气孔密度和气孔长度随海拔的升高呈现曲线变化。其中比叶面 积、气孔长度先增大后减小，气孔密度先减小后增大，毛基密度总体上呈增大趋势，而上述 指标均在 1935 m 处呈现出显著转变。此结果表明海拔 1935m 左右是该研究区辽东栎的最佳 生长区域。 关键词： 古生物学; 辽东栎; 叶表皮; 海拔; 崆峒山 中图分类号：Q948 15 Leaf characteristics of Quercus liaotungensis at different altitudes in Kongtong Mountain of Gansu Province, China LI Qijia, CHEN Wenxing, WANG Maojiang, DING Suting, SUN bainian, WU Jingyu 20 (School of Geological Sciences and Mineral Resources, Lanzhou University, Lanzhou 730000) Abstract: Leaves of Quercus liaotungensis Koidz. collected from different altitudes of Kongtong mountains were examined and analyzed . Specific leaf area, stomatal density, stomatal length and trichome base density of Quercus liaotungensis Koidz. at different altitudes are determined to explore its altitude adaptation and provide the basis for paleoenvironmental reconstruction. The 25 30 result shows that: Specific leaf area (SLA), stomatal density (SD), stomatal length (SL) and leaf area (LA) were non-linear with increasing altitude, Below 1935 m, SLA and LA increased with increasing altitude, whereas SD decreased significantly. In contrast, when altitude was above 1935 m, these traits had reverse patterns. However, trichome base density reveals a uptrend as the altitude becomes higher except the locality in 1935 m. Q. liaotungensis had different variation patterns along the altitudinal gradient; 1935m might be the best growth region for Q. liaotungensis in this region of interest. Key words: mountains Palaeontology; Quercus liaotungensis; Leaf epidermis; Altitude; Kongtong  35 40  0 引言 叶片作为植物进行光合作用和呼吸作用的主要器官,与周围环境联系紧密,是植物体暴露 于大气环境中面积最大的器官,对环境因子如水分、温度、光照等的变化敏感、可塑性大,随 环境变化叶片往往表现出叶外部形态、叶厚度及内部解剖结构的差异[1-4]。因此植物叶片形 态和解剖结构被认为最能反映环境因子对植物的影响以及植物自身对环境的适应。海拔梯度 由于包含了温度、湿度、光照等诸多环境因子的剧烈变化而成为研究植