Table 2 Fitted parameters and goodness of fit for the different submodels—live fuel moisture content (LFMC), proportion of foliage mortality in the canopy (αdead), and dead fuel moisture content (DFMC)—as well as the full canopy fuel moisture content (CFMC) model for the oak species (Quercus ilex). The parameters for the CFMC model include the osmotic potential at full turgor \({\pi }_{0}\) (MPa), the modulus of elasticity of the symplasm (\({\varepsilon }_{Sym}\), MPa), the leaf dry matter content (LDMC, mg.g−1), and the leaf apoplasmic fraction (\({\alpha }_{f}\)). The parameters for the \({\alpha }_{dead}\) model are the slope (%.MPa−1) and water potential for which 50% mortality is observed (ψf50, MPa). The parameter for the DFMC model is the rate of moisture decay with increasing VPD (m, %.kPa−1). The performance metrics include the root-mean-square error (RMSE, %), the mean absolute error (MAE, %), and the coefficient of determination (R2)
Model | Parameters | Performance | |||||
|---|---|---|---|---|---|---|---|
LFMC | \({\pi }_{0}\) | \({\varepsilon }_{Sym}\) | LDMC | \({a}_{f}\) | RMSE | MAE | R2 |
− 2.9 | 15.7 | 521 | 0.26 | 7.6 | 6.2 | 0.78 | |
\({\boldsymbol{\alpha }}_{{\varvec{d}}{\varvec{e}}{\varvec{a}}{\varvec{d}}}\) | slope | \({\psi }_{f50}\) | - | - | RMSE | MAE | R2 |
42.5 | − 7.5 | - | - | 7.6 | 5.1 | 0.94 | |
DFMC | m | - | - | - | RMSE | MAE | R2 |
1.06 | - | - | - | 6.9 | 38.7 | 0.34 | |
CFMC (full model) | - | - | - | - | RMSE | MAE | R2 |
- | - | - | - | 9.4 | 7.5 | 0.87 | |