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三峡库区紫色土陡坡地径流小区大雨强模拟降雨实验表明 ,以等高植物篱为代表的坡地生态工程能相当有效地减少坡面侵蚀量、径流量和坡面氮、磷养分损失量。由于植物篱和带间覆盖稿秆对径流的阻滞作用使坡面径流与表土的混合、养分溶解交换过程更加充分 ,径流携带的养分流失成为有效养分流失的主要方式。通过施肥改善土壤渗透特性、抗蚀性及带间覆盖能明显提高控制坡面产沙、产流和养分流失。等高植物篱 -农作系统各种处理中以施用有机肥和配施有、无机肥 -带间麦秆覆盖两种处理效果最好。
Rainfall simulations on runoff plot of purple soil steep slopes in the Three Gorges Reservoir area show that slope ecological engineering, such as contour hedgerow, can reduce slope erosion, runoff and nitrogen and phosphorus nutrient loss on the slope more effectively. Because of the block effect of hedgerows and intercropping manure on runoff, the runoff and topsoil are mixed by surface runoff, nutrient dissolution and exchange process is more sufficient, and runoff carrying nutrient loss is the main way of effective nutrient loss. Through fertilization to improve soil infiltration characteristics, corrosion resistance and inter-band coverage can significantly improve the control of slope sediment yield, runoff and nutrient loss. Contour hedgerows - organic farming system with a variety of organic manure and fertilizer application, inorganic fertilizer - with the best between the two strips of wheat straw cover.