Fig. 7.

The range (indicted by boxes), median (horizontal line within boxes), and mean (dotted line within boxes) of: (A) transpiration rate (E, mmol m^–2 s^–1), (B) leaf-to-air vapour pressure difference (VPD, kPa), (C) CO₂ assimilation rate (A, µmol m^–2 s^–1), (D) leaf temperature (T _leaf, °C), and (E) leaf surface conductance, comprising the sum of stomatal and boundary layer conductances g _s and g _b (g, mol m^–2 s^–1) during measurements of leaf hydraulic conductance (k _leaf) at both low (500 µmol m^–2 s^–1 PAR) and high light (1300 µmol m^–2 s^–1 PAR), for H. annus plants grown under ~190 (grey boxplot), 450 (open boxplot), and 1030 ppm CO₂ (dark grey boxplot). Note that here, g _b is considered sufficiently high such that g ≈g _s.