Study on distribution and use of rainfall of interval coverage on Lou soil slope land

Using indoor artificial simulated rainfall, rainfall use efficiency, wetting front shape and soil moisture content were analyzed to investigate water distribution and rainwater use of interval coverage on Lou soil slope land. The results showed that with area ratio increased, under same rainfall intensity and slope, rainfall use efficiency decreased, and the maximum rainfall use efficiency of uncoveraged treatment was 58.93%. There was no significant difference in wetting front shape and the maximum depth of each treatment, and the maximum depth was 17cm, which located at the conjunction point of coverage area and infiltration area, which all were higher than that of CK. Soil profile moisture distribution of each treatment accorded to general rule, which gradually decreased from surface to deeper layer. Water content at the conjunction point was slightly higher than other points. Average soil moisture content in infiltration area decreased with area ratio increased, but they were all higher than that of CK. The results also showed that coverage measures could increase actual acceptable rainfall and soil water storage of infiltration area. But how to determine appropriate area ratio to improve rainwater use efficiency under different experimental conditions still need to be further investigated.