北京山区三种林下灌木水力结构、叶片功能性状及其环境适应策略

张箫荻, 王晓霞, 章毓文, 侯靖雨, 石骁鹏, 和璐璐, 刘亚栋, 薛柳, 何宝华, 段劼

Hydraulic architecture, leaf functional traits and environmental adaptation strategies of three understory shrubs in Beijing mountainous areas

ZHANG Xiao-Di, WANG Xiao-Xia, ZHANG Yu-Wen, HOU Jing-Yu, SHI Xiao-Peng, HE Lu-Lu, LIU Ya-Dong, XUE Liu, HE Bao-Hua, DUAN Jie

图9 北京地区3种灌木水力结构及功能性状主成分(PC)分析。Aves/Axyl, 导管面积/木质部面积; Dh, 水力直径; Dm, 平均导管直径; Dv, 导管密度; Gs, 气孔导度; Ks, 木质部比导水率(根、茎、枝均值); LA, 叶面积; LDMC, 叶干质量; LMA, 比叶质量; LT, 叶厚度; Pn, 净光合速率; Tr, 蒸腾速率; VD, 次级叶脉直径; VI, 水力脆弱性指数(根、茎、枝均值); VLA, 次级叶脉密度; VV, 叶脉体积; WUEi, 叶片水分利用效率; ψmid, 正午叶水势。

Fig. 9 Principal component (PC) analysis of hydraulic structure and functional traits of three shrubs in West Mountains of Beijing. Aves/Axyl, vessel area/xylem area; Dh, hydraulic diameter; Dm, mean vessel diameter; Dv, vessel density; Gs, stomatal conductance; Ks, xylem specific hydraulic conductivity (root, stem, shoot mean); LA, leaf area; LDMC, leaf dry matter content; LMA, leaf mass per area; LT, leaf thickness; Pn, net photosynthetic rate; Tr, transpiration rate; VD, secondary vein diameter; VI, hydraulic vulnerability index (root, stem, shoot mean); VLA, secondary leaf vein density; VV, leaf vein volume; WUEi, leaf instantaneous water use efficiency; ψmid, mid-day leaf water potential.