Effects of Soil Texture and Bulk Density on Soil Water Infiltration in Bare Rock Gravel Land

Abstract

In order to explore the influence of different bulk density on soil water infiltration process after soil cover treatment in gravel area, this study selected two different texture types of soil, Lou soil and yellow-brown soil, through indoor soil column infiltration test, compared and analyzed the water infiltration process of gravel soil under different bulk density conditions of these two soils, and provided theoretical basis for soil cover treatment in such areas. The results showed that bulk density had a great influence on the infiltration process of the experimental soil in the two germplasm plots, and the infiltration capacity of the experimental soil decreased with the increase of soil bulk density. The stable infiltration rate of the two soils was negatively correlated with the bulk density (R 2 > 95%), and the effect of bulk density on the stable infiltration rate of Lou soil was greater than that of yellow-brown soil. At the same time, the larger the bulk density, the smaller the cumulative infiltration. There was a significant linear negative correlation between the cumulative infiltration and the bulk density of the two soils within 100 min. Compared with the Philip equation, the Kostiakov infiltration model can better reflect the whole infiltration process of Lou soil and the infiltration of yellow-brown soil in the first 40 min. The infiltration process of yel-low-brown soil after 40 min can be well described by linear equation. In the process of soil water redistribution, the greater the soil bulk density in the same soil layer height, the smaller the water content, and the soil water content increases with the increase of soil depth. The result of soil water redistribution is that the greater the bulk density, the greater the water storage of 0~30 cm soil.