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在元谋干热河谷地带分别布设水平阶整地径流小区与对照径流小区,观测两个小区在2009年雨季的产流量、产沙量以及N、P输出浓度和输出量。定点野外监测与实验室试验研究结果显示:水平阶的应用拦蓄了大量的地表径流和泥沙,对径流的拦截率和对泥沙的削减率分别为69.74%和76.67%,起到了良好的保持水土作用;N、P的流失量也分别减少了45.26%和65.11%,水平阶整地对控制面源污染物具有重要意义。
In the dry-hot valleys of Yuanmou, horizontal runoff plots and controlled runoff plots were respectively laid out to measure the annual runoff and sediment yield and N and P output concentrations and outputs of the two plots in the rainy season of 2009. Site-directed field monitoring and laboratory test results show that: the application of the level of a large number of surface runoff and sediment storage, runoff blocking rate and sediment reduction rate of 69.74% and 76.67%, played a good hold Soil and water effects; N, P loss also decreased by 45.26% and 65.11% respectively, and horizontal leveling is of great significance for controlling non-point source pollutants.