南方气候区草坪草需水规律试验研究

Based on the experiment date derived by lysimeter in the field, reference crop evapotranspiration were calculated by using Penman-Monteith equation and Priestley-Taylor equation, and turfgrass actual eapotranspiration were achieved by water balance equation, therefore crop coefficients of turfgrass were calculated based on the above results. The variations of crop coefficient were analyzed and the regression model between crop coefficient and time was established as well. Results show, the calculated reference evapotranspiration from Priestley-Taylor equation has no significant difference with that from Penman-Monteith formula, and Priestley-Taylor equation is recommended under the data shortage situation; the calculated crop coefficients from Priestley-Taylor equation show low-high-low trend. There is a good three multinomial relationship between the crop coefficient and the time after transplant, and the equation may be a convenient method to calculate the crop coefficient of turfgrass.