Figure 3. Relationships between environmental conditions and whole-tree gas fluxes before (dots, dashed black line) and after girdling (circles, dashed red line) of Eucalyptus tereticornistrees (n = 6). Data represent hourly measurements (07:00-16:00 h) recorded from 6 to 15 May (pre-girdling) and 17-24 May 2014 (post-girdling). Left-side panels show responses of CO2fluxes and right-side panels those of H2O fluxes to environmental conditions. Environmental conditions are photosynthetic active radiation (PAR, top panels), air temperature (Tair, middle panels) and vapour pressure deficit of the atmosphere (VPD, bottom panels). Best fit functions and their coefficients of determination are shown in each panel.