高寒草原优势种紫花针茅叶片解剖结构对青藏高原高寒干旱环境适应性分析

吴建波, 王小丹

Analyzing leaf anatomical structure of dominant species Stipa purpurea adapting to alpine and drought environment at Qingzang Plateau

WU Jian-Bo, WANG Xiao-Dan

表3 青藏高原高寒草原紫花针茅叶结构特征与气候因子的相关性

Table 3 Correlations between climatic factors and leaf structures of Stipa purpurea at alpine steppe of Qingzang Plateau

外表皮厚度 Outer epidermal thickness 内表皮厚度 Inner epidermal thickness 角质层厚度 Cuticle thickness 气孔宽度 Stoma width 叶片厚度 Leaf thickness 导管直径 Cavities diameter 厚角细胞厚度 Collenchymatous cell thickness 主脉导管腔面积/ 主脉维管束面积 Catheter cavity area/area of main vascular bundle 维管束面积/ 叶横切面积 Vascular area/leaf cross sectional area 年降水量 Mean annual precipitation (mm) 0.58 0.42 0.30 0.21 0.01 -0.55 -0.78* -0.87** -0.61 年平均气温 Mean annual air temperature (℃) -0.34 -0.39 0.24 -0.31 -0.12 0.15 0.50 0.21 0.77* ≥0 ℃积温 ≥0 °C accumulated temperature 0.11 0.29 -0.56 0.50 0.56 0.64 0.34 0.67 0.33 年蒸发量 Mean annual evaporation (mm) -0.43 -0.26 -0.21 -0.05 0.16 0.61 0.76* 0.79* 0.76* 年降水量/年蒸发量 Mean annual precipitation/mean annual evaporation 0.59 0.44 0.32 0.21 0.00 -0.55 -0.83* -0.87** -0.71* 湿润指数 Humidity index 0.29 0.07 0.56 -0.18 -0.31 -0.69 -0.65 -0.91** -0.50 生长季平均气温 Mean air temperature during growing season -0.50 -0.39 0.19 -0.24 -0.01 0.51 0.57 0.64 0.81* 生长季降水量 Mean precipitation during growing season 0.52 0.28 0.05 0.10 -0.16 -0.75* -0.51 -0.90** -0.53 7月平均气温 Average air temperature at July -0.42 -0.27 0.07 -0.10 0.12 0.59 0.55 0.70 0.79* 7月降水量 Mean precipitation at July 0.50 0.28 0.05 0.11 -0.15 -0.73* -0.48 -0.87** -0.47