地下水埋深对冻融土壤水分入渗特性影响的试验研究

Experimental study on the influence of the buried depth of groundwaterlevel on the infiltration characteristics of freeze thaw soils

本文基于冻融期间大田测坑不同地下水埋深条件下，自然冻结土壤水分入渗试验，分析讨论了地下水埋深对冻融土壤水分入渗能力、相对稳渗率的影响和冻融期间土壤入渗能力的变化特点．结果表明：地下水埋深对冻融土壤入渗能力的影响十分明显；土壤入渗能力随地下水埋深的增大而增大；冻融土壤的相对稳渗率随地下水埋深的减小而减小；冻融期间地下水埋深小的土壤的入渗能力始终小于地下水埋深大的土壤的入渗能力．地下水埋深对冻融土壤水分入渗能力的影响通过其对地表土壤含水量的影响而实现．研究结果对于指导季节性冻土地区冬、春灌溉合理灌水技术参数的确定具有实际意义．

Based on the infiltration experiments of natural freeze thaw soils in field lysimeters whth different groundwater levels within freezing and thawing period,the influence of the buried depth of ground water level on the capacity and the relative steady infiltration rates of freeze thaw soils as well as the characteristics of soil infitration capacity are analyzed and discussed.The results indicate that the buried depth influences clearly on the infiltration capacity of freeze thaw soils.The result is of practical meaning in determining the reasonable irrigation technical parameters within the winter and spring irrigation in searsonal frozen districts.