| Popis: |
A lysimeter study was conducted to evaluate evapotranspiration combination models using evapotranspiration (ET) rates of Red Sunset red maple (Acer Rubrum ‘Red Sunset’) trees grown in a controlled-environment greenhouse. The measured ET was compared with two empirical climatic factors, solar irradiance and vapor pressure deficit, and with calculated ET based on four evapotranspiration models, Penman, Penman-Monteith, Stanghellini and Fynn. Each of the models was algebraically reduced to common and consistent terms. The relationship between measured and calculated ET was best using the Stanghellini model (correlation coefficient (r) = 0.958, root mean square error (RMSE) = 0.006, average absolute error (AAE) = 0.004), while the others yielded correlations of r = 0.940, r = 0.886, r = 0.872 for Fynn, Penman-Monteith, and Penman, respectively. Vapor pressure deficit alone yielded a good correlation to measured ET (r = 0.940), while solar irradiance had r = 0.807. |
