滴灌和微润灌条件下桂西北山区典型土壤水分运移规律分析

为了研究滴灌和微润灌在广西山区主要土壤的水分运移规律,在广西山区选择砂土、壤土和黏土等三种典型土壤,在室内建立并开展土壤水分运移规律试验。试验结果表明:1在地埋黏土、壤土和砂土以及0.10 MPa工作压力条件下,微润管的单米流量分别为0.24、0.31和0.43L/h,为地表出流量的67.6%~98.8%,滴灌管的单米流量为4.17、5.92和6.10L/h,为地表出流量的38.1%~68.2%;2在3种土壤中,滴灌和微润灌的水分运移形状初期为圆形,后期为椭圆形,但砂土的湿润范围最大、壤土次之、黏土最小;3在土箱相同位置,黏土的土壤含水率最大,壤土次之,砂土最小;4根据滴灌和微润灌的土壤水分运移规律,提出滴灌管和微润管在砂土、壤土的适宜埋深为20cm,在黏土的适宜埋深为10cm。

Research on Soil-water Movement Characteristics of Guangxi Main Soil Under the Condition of Moisture Irrigation and Drip Irrigation

Moisture irrigation and drip irrigation have already been applied in hill area of Guangxi.This experiment simulated the con-dition and irrigation schedule of sandy soil,loam soil and clay soil under the condition of Moisture irrigation and drip irrigation.The results show that:① on the condition of 0.10 MPa and ground of clay,loam and sand,the flow of moisture tube were 0.24、0.31 and 0.43 L/h,the flow of drip tube were 4.17、5.92 and 6.10 L/h.②the migration velocity of soil-water in the sandy soil is higher that in the loam soil,which in the clay soil is the lowest and the variation law of soil-water content was basically consistent.③The soil-water content in the clay soil is higher that in the loam soil,which in the sandy soil is the lowest.④Based on the results of this experiment,the capillary of sand,loam and clay in hill area reasonable depth should be 20,20 and 10 cm.