Fig. 7
Multivariate analysis (PCA) and contributions of the gas exchange and biometric variables to the system (A) and season (B). Centroid and 95% CI for each season are showed. A—net carbon assimilation rate (μmol CO2·m−2·s−1); E—transpiration rate (mmol H2O·m−2·s−1); WUE—water use efficiency (μmol CO2/mmol H2O); Ci/Ca—internal CO2 concentration/ambient CO2 concentration ratio; gsw—stomatal conductance (mol·m−2·s−1); A/Ci—instantaneous carboxylation efficiency (μmol·m−2·s−1/μmol·mol−1)