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不同的紫花苜蓿(Medicago sativa)种植模式控制水土流失的效果存在差异,在甘肃省榆中县孙家岔小流域研究了坡地紫花苜蓿不同种植模式与径流的关系。结果表明,坡地种植的紫花苜蓿草地的径流深与降水强度之间存在线性关系,且随着坡度的增加,产生径流的速率增大;坡地上紫花苜蓿拦截降水的效果显著优于坡耕地和荒坡地(P<0.01);在坡耕地和荒坡地上种植紫花苜蓿,并按5年一遇最大6h降水量的防御标准配套建设水平阶,可全部拦蓄坡面径流。
Different alfalfa (Medicago sativa) planting patterns have different effects on soil erosion control. The relationship between different planting patterns and runoff of alfalfa was studied in Sunjiacha watershed, Yuzhong County, Gansu Province. The results showed that there was a linear relationship between runoff depth and precipitation intensity of alfalfa grassland planted on sloping land, and the rate of runoff increased with the increase of sloping degree. The effect of intercepting precipitation on alfalfa sloping land was significantly better than that of sloping land and wasteland (P <0.01). When alfalfa was planted on sloping farmland and barren slopes, the slope runoff could be completely reserved for the alluvial grasslands according to the supporting standard of 6x maximum rainfall in 5 years.