Fig. 4From: Adaptation of Abies fargesii var. faxoniana (Rehder et E.H. Wilson) Tang S Liu seedlings to high altitude in a subalpine forest in southwestern China with special reference to phloem and xylem traitsCell wall thickness (a) and cell lumen diameter (b) of the xylem conduits in A. fargesii seedlings at 2600 m, 2900 m, and 3200 m altitudes (n = 10 branches per elevational site). Boxplots show the median (horizontal bar), interquartile range (box), range (lines), and outliers (points). Mean values are indicated by small square. P values and significance levels (ANOVA): Pa, altitude effectBack to article page