灌溉水量对无压灌溉水分运移的影响

通过试验,分析研究了不同灌溉水量对无压灌溉入渗过程中水分运移的影响。试验表明,无压灌溉湿润体形状近似为球体,且与土壤类型、气象条件等外界因素无关,提出了用灌溉水量估计湿润体大小的经验方程;湿润体内水平和垂直方向含水率分布规律表明,各层或各深度范围内含水率变化趋势相近,湿润体内固定点处的含水率在灌水过程中几乎不发生变化,灌溉水量的增加只是用来扩大湿润体的大小。研究结果对无压灌溉灌水定额的制定具有重要指导意义。

The Influence of Irrigation Water Volume to Water Movement under Non-pressure Irrigation

Through the experiments on non-pressure irrigation,the text studied the influence of irsigation water volume to water movement.The results show that the figure of the soil infiltration body is sphere,and it has nothing to do with external elements such as soil type,meteorological condition,etc.The experience equation has been proposed to appraise the soil infiltration body size with irrigation water volume.The distribution rule of soil moisture content show that it is closed to the change tendency of soil moisture content which lies in the per horizontal and vertical direction,the soil moisture content in the fixing point hardly changes during the irrigation process,the increasing of irrigation water volume is only used to enlarge the soil infiltration body size.The findings have the important value to formulate the irrigation water volume.