In order to provide theoretical support for the sand-mixing system of water storage and fertilizer conservation in arid and semi-arid areas, the experiment used artificial simulation of rainfall indoor to study the effects of sand mixed rate on soil water infiltration and redistribution under inadequate water supply. The soil cylinder incubation treatments were setup including 0 (Control), 25%, 50%, 75% of sand mixing rate. Research indicates: (1)The treatment of sand mixed can speed up the process of wet front movement. The higher the sand mixed rate, the more obvious the effect, and the greater the effect when the sand mixed rate is more than 25%.(2) The higher the sand mixed rate, the smaller the water content in the soil of sand mixed, The greater the water content and the better the water retention below the soil of sand mixed. Sand mixing rate of more than 50% can achieve better water retention .When the sand mixing rate is 75%, the soil moisture content at the depth of 30 cm is increased by about 40% compared with the soil without sand mixing. (3) When the sand mixed rate is 75%, the soil moisture content is the highest at 15 cm depth, and the soil moisture retention is the best at 30 cm depth during the redistribution phase. So when the sand mixed with a higher rate, the best aquifer is 15 ~ 30 cm. It provides continuous water supply for plant growth.
Key words
inadequate water supply /
sand mixed rate /
infiltration /
redistribution /
wetting front
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