1 引言 正确地掌握耕地蒸散量,不仅有利于土壤水分管理,而且有利于提高产品的产量和品质。因此,提出了许多预测蒸散量的模型,但还没有在任何地区环境条件下,都能使用的完整模型。 蒸散现象,在许多情况下受气象条件所支配,因此,蒸散量的预测模型,也由种种气象条件所构成,但是,如果土壤水分不足,作为蒸散面的土壤表面,就会 1 Introduction Correctly grasp the evapotranspiration of cultivated land, not only conducive to soil moisture management, but also help to improve product yield and quality. Therefore, many models for predicting evapotranspiration have been proposed, but there is no complete model that can be used under any local environmental conditions. Evapotranspiration, which in many cases is dominated by meteorological conditions, predicts models of evapotranspiration and is also composed of a variety of meteorological conditions, but if the soil moisture is insufficient, the surface of the soil, which is the evapotranspiration surface,