| Sediment and water control effects by stone sill reverse-slope level terrace in slope farmland with thin soil layer |
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| DOI：10.7606/j.issn.1000-7601.2015.06.41 |
| Key Words: slope farmland with thin soil layer stone sill reverse-slope level terrace sediment control runoff control |
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| Abstract: |
| In order to research the sediment and water control effects by stone sill reverse-slope level terrace in slope farmland with thin soil layer, two standard natural rainfall runoff plots (measure and control plots) were set up and carried out the observation to the rainfall runoff and sediment respectively. The results showed that: The stone sill reverse-slope level terrace could effectively controlled the surface runoff on the slope farmland. The mean yearly runoff could be reduced by 22.5% and under the condition of short duration and high intensity rainfall, the control effects were better than the long duration and low intensity rainfall. The sediment control effects by this measure on slope farmland were notable and stable. The yearly mean sediment reduced rate was 95.5%. The fluctuation range of sediment with change of rainfall characteristic in the measure plot was far smaller than the control plot. Through the measure of stone sill reverse-slope level terrace to reduce the slope erosion, indirectly increase the crop yield in slope farmland, so the yield of spring maize had been increased by 6.2% each year. |