Design Strategies and Soil Erosion Reduction Effect of Soil and Water Conservation Measures in Hilly Area of Central Sichuan Basin

Soil and water conservation(SWC) strategy is one of the most important issues for soil erosion control.Designing strategies and soil erosion reduction effect(SERE) of SWC measures are modeled for farming-type small watershed of Changzhi project.The results show that:①the controlling area of small watershed depends mainly on the area of soil erosion,which takes up 90.4% of the latter.The other specific controlling measures mainly depend on the controlling area,taking up 8%-31.9% of the latter.But enclosed area was mainly affected by low-quality forest area and wild land;② SERE of controlling measures which are terracing,building soil and water conservation forest(BWSCF),building cash forest,closing hillside for erosion control,conservation tillage reached 2430 t/km2·a,4275 t/km2·a,3994 t/km2·a,3614 t/km2·a,2191 t/km2·a respectively,and sediment reduction ratio reached 8.4%,30.3%,24.8%,22.7%,13.8% respectively;②The BWSCF ratio should be higher than 24% for the study watershed.