Figure 6.

Performance of the SOX+ model calibrated without (“Hydraulic,” A, in red) and with (“Hydraulic + NSL,” B, in blue) non-stomatal limitations of photosynthesis. (A,B) show the comparison between simulated and observed transpiration (in kg tree⁻¹day⁻¹, points ± SD error bars), during the experiment (DOY 212–265). Daily simulated transpiration is the projected median by sampling 500 times each of the SOX+ model formulation posterior parameter estimates. Noted is the generalized linear model accounting for temporal autocorrelation, model fit ($R_{\text{cs}}^2$), and the RMSE. In both formulations, the slope was not significantly different than 1 (p < 0.01), and the intercept was not significantly different than 0 (p < 0.01). (C) represents the SOX+ error in transpiration estimates for the calibration period (DOY 212–230), and for the Hydraulic (red, dashed lines) and Hydraulic + NSL (blue, continuous lines) formulations. Simulation error was calculated as $\frac{T{r}_{sim}-T{r}_{obs}}{T{r}_{obs}}$, where Tr_sim is the daily median transpiration from the 500 model, and Tr_obs is the daily observed transpiration, both in kg tree⁻¹ day⁻¹. Horizontal lines represent the median simulated error for each SOX+ formulation.