四川紫色土区小流域土壤养分流失初步研究

Study on Soil Erosion of the Small Watershedin the Purple Area of Sichuan

通过对四川紫色土区小流域降雨的观测、径流养分和泥沙含量的分析,初步探讨了紫色土区养分的流失规律。多数研究认为,土壤养分大部分随泥沙携带而流失,而本文的研究结果却表明了:在研究区域,土壤养分流失的主要途径是径流的流失,而随泥沙携带的潜在土壤养分,由于产沙量较少,其流失总量并不多。

Through making rainfall observation, analyzing nutrient loss in the runoff and the concentration of eroded sediment, the process of nutrient loss in the purple area was initially explored. The result indicated that soil nutrient was mostly lost along with the eroded sediment. However, the results in the purple area indicated that the main way of the soil nutrient loss is the loss accompanied with the runoff, the nutrient loss associated to sediment is little because of lower sediment concentration in runoff.