【摘要】 本文以概念性模型为基础 ,把农田水分转化关系概括为降水 (或灌溉 )入渗、作物腾发和根区下界面水分通量三个模型 ,并通过根区土壤水平衡方程有机的结合在一起 ,由此组成了一个完整的田间水分转化模型。提出了一个能更好地描述土壤水运动实际情况的根区下界面水分通量模型 ,通过建立该模型中根区下界面水分通量变向临界土壤储水量与地下水埋深的关系 ,考虑了地下水埋深变化对作物腾发量及田间水分转化关系的影响。农田水分转化关系模型的建立将有助于人们进一步定量地认识根区下界面水分运动过程 ,也将为农田节水灌溉与高效用水提供重要理论依据更多还原

【Abstract】 Based upon the conceptual model,the conversion relationship of farm moisture is summarized into three submodels,they are the precipitation(or irrigation)infiltration submodel,the crops evapotranspiration submodel and the moisture flux submodel of lower interface of root zone.Relating the above three submodels to each other through the soil moisture balance equation in root zone,a complete farm moisture conversion model is constituted.A modified soil moisture flux model of lower interface in root zone is given,which can better decribe the actual situation of soil moisture motion in root zone.The influence of variation of the depth to ground water table on the crops evapotranspiration and on the farm moisture conversion relationship is also considered by establishing the relationship between the moisture flux,the soil moisture that moves upwards or downwards passing over the lower interface of the root zone depending on the critical soil moisture in the root zone and the depth to groundwater table.The farm moisture conversion relationship model established in this paper will help quantitative understanding of the moisture motion process in lower interface of root zone and providing an important theory for farm water-saving irrigation and high efficiency use of water.更多还原