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| Influence of various soil textures and layer positions on infiltration characteristics of layered soils |
| LI Yi-1, 2 , Ren-Xin-1, 3 , Horton Robert4 |
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Abstract In order to compare the effects of layer positions and soil texture variation on infiltration characteristics of layered soil, two types of soils were selected. Ponded infiltration experiments were conducted at three layer positions. The following results were showed: At the three layer positions, 5-10 cm, 10-15 cm and 20-25 cm from soil surface, the time when the wetting front reached the layer interface and the corresponding cumulative infiltration were dependent on the layer positions and soil texture in layers. The upper the layer positions, the shorter the time for the wetting front arriving at the layer interface, and the smaller the corresponding cumulative infiltration. Effect of infiltration reduction was the best when layer position was 10-15 cm from the soil surface. The deeper the layer position, the more obvious the change in infiltration rate and the higher the infiltration rate curve moved up. Before water entered the layer interface, the cumulative infiltration and wetting front were increased nonlinearly with time; however, once the water was in the interface, they raised in a nearly linear relation against time. There was an approximately linear relationship between cumulative infiltration and wetting front, but their relations varied with the layer positions. Soil moisture distributions in layered soils showed a discontinuity, they were also affected by the soil texture in layers. In general, layer positions had obvious effects on infiltration of layered soils.
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Received: 01 November 2011
Published: 30 July 2012
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