影响土壤水分入渗特性主要因素的试验研究

以大田土壤入渗试验为依据,分析讨论了影响大田土壤水分入渗特性的主要因素.试验结果表明:土壤含水量、土壤质地及土壤结构是土壤水分入渗特性的主导影响因素;土壤含水量、土壤质地及土壤结构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;以土壤粒径小于0.002 mm的黏粒质量百分数为反映土壤质地的物理量,土壤质地由轻变重,土壤入渗能力减小;土壤结构由疏松变密实,土壤入渗能力递减.研究结果对于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.

Experimental Study on Main Factors Influencing Water Infiltration Features of Field Soils

Based on the infiltration experiments of field soils,the main factors which influence the water infiltration features of field soils were analyzed and discussed.The experimental results indicated that the water infiltration features of field soils were influenced by soil moisture,soil structure and soil texture.They have strong influence on infiltration into field soils.Infiltration capacity of field soils decreased while the moisture content increased.The infiltration capacity decreased with soil clay content increasing,where mass percent of clay content of soil grain less than 0.002 millimeter represented soil structures.The infiltration capacity decreased with soil compactness increasing.The result is of practical meaning in determining the field irrigation technical parameters.