膜孔单点源肥液入渗运移特性研究

Study on Transport Characteristics under Film Hole Single Point Source Infiltration of Fertilizer Solution

通过单膜孔点源室内入渗试验,研究了膜孔肥液入渗的分布特性与运移规律。研究表明,膜孔肥液入渗湿润体土壤含水率比清水的大;分析了肥液入渗累积入渗量比清水入渗增加的机理;供水入渗过程中,浓度锋运移距离和浓度最大值均随时间的延长而增大;再分布过程中,浓度锋运移距离继续增大,而浓度最大值逐渐减小;膜孔肥液入渗土壤浓度与土壤含水量的关系在不同时间均近似于“S”型曲线。该研究成果为进一步进行膜孔灌溉技术研究奠定了科学基础。

Based on lab experiment under single point source infiltration of film hole irrigation, the distribution characteristics and transportation law of point source fertilizer solution infiltration were researched. The soil water content of wetting body under fertilizer solution infiltration was larger than that under demineralized water infiltration. The mechanism of cumulative infiltration under film hole irrigation of fertilizer solution more than that under demineralized water was illustrated. The concentration front transport distance of and the maximum value of concentration increased with increased time in the process of water supply. The concentration front transport distance of increased with increased time in the process of redistribution and the maximum value of concentration decreased. The concentration had a ＂S＂ shape correlation with soil water content at the different time. The results lay scientific foundation for further study of film hole irrigation.