A Novel Approach for the Simulation of Reference Evapotranspiration and Its Partitioning

To estimate the irrigation volume required for agriculture and improve water resources utilization efficiency, it is essential to obtain an of reference evapotranspiration (ET0) its components (e.g., transpiration, T0 soil evaporation, E0). This study updated a soil-plant-atmosphere continuum (SPAC) model associated reference-based SPAC (R-SPAC), applied agricultural ecosystem. Model simulations mean hourly ET0 were benchmarked against those Penman-Monteith method by Food Agriculture Organization (FAO-PM) throughout growing season. The resulting good correlation obtained (R2 = 0.96, agreement index, I 0.98, root-mean-square deviation (RMSD) 0.05 mm h?1) validated accuracy R-SPAC model. Sensitivity analysis was used explore uncertainties errors ET0, T0, E0 caused input variables. results showed that net radiation shortwave at site main drivers both FAO-PM models. proposed can be predicting exploring interactions between climate, crop type, in determining under various future environment conditions.