Correlation between modelled and observed leaf and canopy temperatures
Observed variation in ∆Tleaf was strongly predicted by the trait-based energy balance model (∆Tmod), with an RMSE of 3.524 and MAE of 3.116 (Supporting information S7a). However, ∆Tmod tended to underestimate ∆Tleaf forC. australe , and overestimate Tleaf for H. novo-guineensis . This was likely due to errors associated with the differences in Tair at the canopy height of each plant, versus from the clearing where Tair was measured at 2.5 m height. This is reflected in Supporting information S7, where in Supporting information S7b we see how the difference between observed and modelled ∆T are correlated with plant height, and that this trend is driven by a decrease in measured ∆Tleaf with plant height in panel (Supporting information S7c) and no trend of ∆Tmod with plant height in panel (Supporting information S7d). The correlation between ∆Tleaf and ∆Tmod was improved when modifying air temperature and wind speed vertically through the canopy, however as this did not alter results of provenance-differentiation it is not included (analysis not shown).