Fig. 3.
Plots of canopy Tcan versus Tair (both °C) for tree species at Harvard Forest and BCI in Panama. Color shading is by hour of day. Mean values of three broadleaf species (Acer rubrum, Quercus rubra, and Betula papyrifera) at Harvard are shown in (A), while one needleleaf species (Pinus strobus) is shown in (B). Panel (C) displays data for deciduous broadleaf species at BCI, while (D) is evergreen broadleaf species at this forest site. All available values for the growing season are shown for each species, and only daytime data when downwelling shortwave radiation exceeded 25 W m−2 were included. In each panel, the solid line is the 1:1 line and the dashed line and slope are calculated as in Fig. 2.