FIGURE 6.

PAR response curves for NCE—whole-plant net carbon exchange (left panel, μmol m^-2 s^-1), whole-plant Transpiration (middle panel, mmol m^-2 s^-1) and WUE as NCE/E (right panel, μmol CO₂ mmol^-1 H₂O). The relationship is shown for the three water treatments: white dots for “Watered” (measured in July 2017); black dots for “Drought” (measured in August 2017); gray dots for “Watered” (measured in September 2017). The boxplot inset in the right panel shows values of WUE for each treatment when PAR is >1,000 μmol m^-2 s^-1. Only data with PAR >50 μmol m^-2 s^-1 are shown.