为了分析不同公式在蒸散估算方面的适用性,认识毛竹和桉树的水分行为,在以称重法实测盆栽毛竹和桉树的蒸散量的基础上,结合常规气象观测数据,应用线性回归对9个估算公式进行了修正,评定了不同公式的适用性及改进效果,并分析了两种植物的蒸散差异。结果 表明:修正前Jensen-Haise,Hargreaves1975和Doorenbos-Pruitt法估算的毛竹蒸散量精度较高,FAO Penman-Monteith,Hargreaves1975和Jensen-Haise法估算的桉树的蒸散量与实测值较接近; 修正后的参考蒸散公式能显著改善实际蒸散量的估算精度。桉树的蒸散量比毛竹的大38%,且桉树的蒸散量对于气象要素的变化比毛竹的蒸散量更加敏感。9个公式在桂北地区的适用性依次为FAO Penman-Monteith,Jensen-Haise,Hargreaves1975,Doorenbos-Pruitt,Priestley-Taylor,Hargreaves1985,Makkink,Abtew,Turc。
To analyze the applicability of the different formulas for estimating evapotranspiration and to explore the water behavior of Phyllostachys edulis and Eucalyptus grandis×E. urophylla, based on the measured evapotranspiration of potted Phyllostachys edulis and Eucalyptus grandis×E. urophylla using weighting method and the calculated evapotranspiration with conventional meteorological data, the estimation formulas were modified by using linear regression approach. The modification improvement and the applicability of these formulas were evaluated; in addition, the evapotranspiration difference of the two plants was analyzed. The results show that before modification, the accuracy for evapotranspiration of Phyllostachys edulis estimated by the Jensen-Haise, Hargreaves1975 and Doorenbos-Pruitt methods is relatively high, and the evapotranspiration values of Eucalyptus grandis×E. urophylla estimated by the FAO Penman-Monteith, Hargreaves1975 and Jensen-Haise methods are close to the actual measured values. The accuracy of actual evapotranspiration estimation is improved significantly by the modified evapotranspiration Formulas. It is also shown that the evapotranspiration of Eucalyptus grandis×E. urophylla is up to 38% larger and more sensitive to the change of meteorological factors than that of Phyllostachys edulis. The order for applicability of these 9 formulas in Northern Guangxi is found as FAO Penman-Monteith, Jensen-Haise, Hargreaves1975, Doorenbos-Pruitt, Priestley-Taylor, Hargreaves1985, Makkink, Abtew and Turc.
