The varying texture of soil is one of the most important factors influencing soil and water losses. Experiments were conducted on different soil plot runoff and sediment yielding processes and their impact factors under simulated rainfall conditions. Results showed that the infiltration ate of light soil is greater than medium and heavy soil. Under the conditions of a soil water content of about 11%, rainfall intensity of 1.5mm/min, and a duration of 70 min, the infiltration rate of heavy soil, medium soil and light soil were 0.338mm/min, 0.656 mm/min and 0.974 mm/min respectively. The runoff coefficients were 0.804, 0.561 and 0.396 respectively. The three soil plots are sediment yielding processes are different. Heavy soil plots are mainly eroded by sheet, light soil by collapse, and medium soil by rill. The soil water content has different effects on soil plot runoff and the sediment generation processes of the three soils. It has a more obvious effect on light soil than medium soil and has a slight effect on heavy soil. The relationship be tween soil accumulative infiltration volume (f), runoff coefficient (k),, sediment yield (S) and precipitation time (t) was analyzed by nonlinear regression, and the results were as predicted.
The varying texture of soil is one of the most important factors influencing soil and water losses. Experiments were conducted on different soil plot runoff and sediment yielding processes and their impact factors under simulated rainfall conditions. Results showed that the infiltration ate of light soil is greater than medium and heavy soil. Under the conditions of a soil water content of about 11%, rainfall intensity of 1.5mm/min, and a duration of 70 min, the infiltration rate of heavy soil, medium soil and light soil were 0.338mm/min, 0.656 mm/min and 0.974 mm/min respectively. The runoff coefficients were 0.804, 0.561 and 0.396 respectively. The three soil plots are sediment yielding processes are different. Heavy soil plots are mainly eroded by sheet, light soil by collapse, and medium soil by rill. The soil water content has different effects on soil plot runoff and the sediment generation processes of the three soils. It has a more obvious effect on light soil than medium soil and has a slight effect on heavy soil. The relationship be tween soil accumulative infiltration volume (f), runoff coefficient (k),, sediment yield (S) and precipitation time (t) was analyzed by nonlinear regression, and the results were as predicted.
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