Optimization of water uptake and photosynthetic parameters in an ecosystem model using tower flux data

The soil water stress factor (fw) and the maximum photosynthetic carboxylation rate at 25°C (Vcmax) are two of the most important parameters for estimating evapotranspiration and carbon uptake of vegetation. Ecologically these two parameters have different temporal variations and thus their optimization in ecosystem models poses a challenge. To minimize the temporal scale effect, we propose a three-stage approach to optimize these two …