土壤含水量对土壤入渗能力的影响

Influence of Moisture Content on Infiltration Characteristics in Field Soils

基于大田多种不同土壤含水量条件下的土壤水分入渗试验,分析讨论了土壤含水量对大田土壤水分入渗能力、入渗率和Kostiakov(两参数)模型(h=Ktα)的两个入渗参数的影响。试验结果表明:土壤含水量对大田土壤入渗能力的影响十分明显;土壤累积入渗量随土壤含水量的增加而减小;两个入渗参数随土壤含水量变化趋势明显,较好符合对数关系。研究结果对于大田灌溉、地面灌溉合理灌水技术参数的确定及水资源合理利用具有重要价值。

Based on the water infiltration experiments in field soil with different moisture content, effects of moisture content on cumulative infiltration, two infiltration parameters of Kostiakov infiltration equations, and the change of infiltration capacity of field soil was analyzed and discussed in this paper. The results indicated that infiltration capacity of field soil decreased while the moisture content increased. The relationship between two infiltration parameters and soil moisture content conformed to logarithm function law. The result is of practical meaning in determining the field irrigation technical parameters.