Development of the model of estimating evapotranspiration using climate data and vegetation factors.

该研究的目的是利用简单的气候资料和植被因子建立估算蒸散量的模型。为此，作者利用Bowen比率技术和微气象条件，如温度、相对湿度、土壤水分张力、植被覆盖度、植被高度和叶片气孔导度，在不同气候地区、不同地区和不同植被类型(1)斯里兰卡、(2)泰国、(3)瑞典、(4)北海道、(5)Kantho地区测量了实际蒸散量。通过加入风速和植被盖度，改进了蒸散量的经验模型，改进了Aoki等人的蒸散量经验模型。(1993)。通过增加气孔导度和植物高度进行了进一步的改良。但由于气孔导度的数据较少，计算结果的真实性较差，所以该方程并不明确，但在模型中加入两个因子后，计算蒸散量的误差有所减小。

The aim of the research project is to develop the model of estimating evapotranspiration using simple climate data and vegetation factors.For this porpose, the authors measured actual evapotranspiration using Bowen ratio technique and micrometeorological conditions such as temeprature, relative humidity, soil moisture tension, vegetation coverage, vegetation hight and leaf stomatal conductance at different climite regions, places, and different types of vegetation as follows : (1) Sri-Lanka, (2) Thailand, (3) Sweden, (4)Hokkaido, (5) Kantho Region. By addint wind speed and vegetation coverage, the author sucesseeded to improv the epirical model of evapotrans-coverage, the autor sucsseeded to improv the empirical model of evapotranspiration made by Aoki et al. (1993).Further improvement was made by putting stomatal conductance and vegetaion height. But the equation was not clear becase of less data and valiety of stomatal conductance, although the equation showed to decrease the error of estimate evapotranspiration if two factors were added by the model.