【摘要】 从能量观点出发,测定土壤水中水分通量为零的界面,可以根据其位置变化来估算农田蒸发,以确定田间需水量。本文依据1988年4—6月,在陕西泾阳农业试验站对拔节—成熟期小麦地的实测资料,详细分析了土壤吸力的时空分布和零通量面位置的变化,运用零通量面法计算了当地冬小麦该时段各生育期的农田蒸散量并分析了在各种典型天气条件下作物对土壤水分的利用情况。更多还原

【Abstract】 In view of energy to determine the boundary face with zero of moistureflux in soils,farmland evaporation can be estimated based on the changes inlocations so as to determine field water requirements,Based on the field deter-mination data in the periods of wheat elongation to maturity in AgriculturalResearch Station in Jingyang County,Shaanxi Province from April to June,1988,this paper analyses the distribution of soil suctions in time and spaceand the changes in the positions of zero-flux plane in details.The zero-fluxplane method was adopted to calculate the amount of farmland evapotranspira-tion of local winter wheat in each section of growing periods,and also,crop wate use under various typical weather conditions was analysed.更多还原