摘要
本文以田间试验资料为基础,建立了一个农田水量平衡模型,模型中根系吸水项采用 DeJong 吸水函数,用农田潜在蒸散量乘以土壤水分胁迫系数计算农田实际蒸散量,降水或灌水后进入土壤每层的水量选用一个雨水分配模型。利用模型模拟的结果研究了冬小麦和夏玉米农田的水分变化规律,并计算了农田实际蒸散量和土壤分层根系吸水量。
Based on the field observing data,a soil layered water budget model was developed in this paper.The term for water uptake by roots in the model was used by DeJong-extraction function.Theac- tual evapotranspiration was calculated by potential evapotranspiration and a water stress factor.The water amount into the layered soil profile after a rain or an irrigation was estimated by an empirical model for rain water distribution.Using the simulated results,the properties of the field water cycle for winter wheat and summer maize were discussed.The actual evapotranspiration and water uptake by roots in the separat- ed soil depth were finally evaluated.
基金
国家教委留学回国人员科研资助项目
