库布齐沙地土壤水分运移规律数值模拟研究

Numerical Simulation of Soil Water Movement in the Kubuqi Sandy Land

以砂土下进行地表滴灌的沙柳、速生杨、旱柳和榆树人工林为研究对象,采用粒径检测激光分析仪进行土壤质地分析得到各土样粒径分布情况,通过HYDRUS-2D/3D数值模拟研究灌水及水分再分布过程中压力水头和含水量的动态变化规律。结果表明:库布齐沙漠北部边缘地区人工林立地土壤中砂粒含量高于70%且黏粒含量低于2.5%,属典型砂质土壤。滴灌流量为3.0 L/h,时长为6 h时,各类人工林根深范围内土壤均能达到饱和含水量,能满足人工林用水需求。

Taking Salix psammophila,Populus popular,Pinus sylvestris and Ulmus pumila for surface drip irrigation under sandy soil as the research object,the particle size distribution of each soil sample was obtained by soil texture analysis using particle size detection laser analyzer.The dynamic change laws of pressure head,soil water content and infiltration rate during irrigation and water redistribution were studied through HYDRUS-2D/3D numerical simulation.The results showed that the sand content in the soil of artificial forest sites in the northern edge of Kubuqi Desert was higher than 70%and the clay content was lower than 2.5%,which was typical sandy soil.When the flow rate of drip irrigation is 3.0 L/h and the duration is 6 h,the soil within the root depth of various plantations can reach the saturated water content,which can meet the water demand of plantations.