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本文分析了蒸发力、土壤有效含水量和作物叶面积指数对农田蒸散量的影响,分别找出了土壤供水充足和供水受限制时的农田蒸散量及其影响因素之间的关系。以水量平衡方程为基础建立了计算和预报农田实际蒸散量的数学模型。本文还提出了计算蒸发力的半经验公式。最后,分析了农田实际蒸散量对蒸发力、初始土壤含水量和叶面积指数的敏感性。
The effects of evapotranspiration, soil available water content and crop leaf area index on farmland evapotranspiration were analyzed in this paper. The relationships between the farmland evapotranspiration and its influencing factors when soil water supply was adequate and water supply was limited were found separately. Based on the water balance equation, a mathematical model for calculating and forecasting the actual evapotranspiration of farmland was established. This paper also proposed a semi-empirical formula for calculating evaporation. Finally, the sensitivity of actual evapotranspiration to evapotranspiration, initial soil water content and leaf area index was analyzed.