9AMATO M, RITCHIE J T. Small Spatial scale soil water content measurement with time domain reflectmetry [J]. Soil Science Society of America Journal 1995, 59(2) : 21-26.
10SCHMUGGE T J, JACKSON T J, MCKIM H L. Surver of methods for soil moisture determination [J]. Water Resources Research, 1980, 15(6): 961-979.