沟灌条件下层状土壤入渗与排水实验研究

Experiment Research on Infiltration and Drainage in Layered Soil Under Furrow Irrigation

利用室内土槽对沟灌条件下层状土壤的入渗与排水特性进行了实验研究。研究结果表明,土壤的分层性状及分层土壤的分布形状对土壤水分的入渗和排水都产生一定的影响。土壤层间界面对土壤水分湿润锋的传播产生一定的阻碍作用;由于土槽中分层土壤的水平分布不同,相对于南侧,北侧由于土壤较密实,测压管水头变化慢、入渗慢,持水能力较大,排水强度也较小。实验条件下,北侧稳定排水强度为0.021 L/min,南侧稳定排水强度为0.030 L/min。

Characteristics of the layered soil infiltration and drainage under the condition of furrow irrigation were investigated using a soil tank experiment. The results show that the layered soil properties and its distribution shape had impact on the processes of infiltration and drainage of the soil water, and the interlayer interface impeded the spread of the wetting front. Furthermore, horizontal distribution of the layer soil in the tank is different. Compared to the south side, the piezometric head have slower change, drained strength is smaller, and water-holding capacity is bigger in the soil of the north side as the compacted soil. Under the experimental conditions, the stable drained strength of the north side is 0. 021 L/min, which of the south side is 0. 030 L/min.