在非饱和土壤水运动的实验研究中,为获得非饱和土壤水分运动与土壤水势能的关系,常用张力计(负压计)来测量土壤水势能与土壤含水量的变化。近年来日本已采用一个压力传感器与一个陶土管相接,来测试土壤含水量,已获得良好效果。美国用一个传感器与扫描阀 In the experimental study of unsaturated soil water movement, in order to obtain the relationship between unsaturated soil water movement and soil water potential energy, a tension meter (negative pressure meter) is often used to measure the change of soil water potential and soil water content. In recent years, Japan has adopted a pressure sensor connected with a clay pipe to test the soil moisture content and has achieved good results. The United States uses a sensor and a scanning valve