Fig. 2

Leaf water potential(a), leaf isotope discrimination (δ13C)(b), stem diameter (c), height (d), leaf:sapwood area (e), specific leaf area (f), phloem:leaf area (g), leaf N contents (h), and xylem:leaf area (i) of 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. Different letters indicate significant differences (P < 0.05) among elevations according to Tukey’s multiple-comparisons method