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在粤北山区裸地、草坡地和耕地等3种石漠化土地的坡面上,采用0.3mm.min-1、0.48mm.min-1、0.72mm.min-1、1.08mm.min-14种降雨强度进行了36场人工降雨模拟试验。结果表明,坡面上3种类型石漠化土地的土壤侵蚀特征、强度各不相同。在同一地类上,土壤侵蚀量随降雨过程的进行呈现出波动下降的趋势,且随雨强的增大,土壤侵蚀量亦增大;土壤侵蚀量与雨强之间均呈现极显著的线性相关关系。在任一雨强条件下,都是裸地的土壤侵蚀量最大,耕地次之,草坡地最小。地表覆被对降雨侵蚀产沙过程有重要的抑制作用,大雨强条件下抑制作用尤为突出;而水平沟耕作方式能减少小雨强条件下的土壤侵蚀量,但随着雨强的增大,其影响也随之降低。
On the slopes of 3 rocky desertified lands, such as bare land, grassland and cultivated land in northern mountainous area of Guangdong, the slope of 0.3mm.min-1, 0.48mm.min-1, 0.72mm.min-1, 1.08mm.min- Fourteen kinds of rainfall intensity 36 artificial rainfall simulation test. The results show that the soil erosion characteristics and intensities of three types of rocky desertification land on slope are different. On the same land, the soil erosion decreased with the progress of rainfall, and the soil erosion increased with the increase of rainfall intensity. The soil erosion showed a significant linear relationship with rainfall intensity relationship. Under any rain and strong conditions, the bare soil had the highest soil erosion, followed by the cultivated land and the smallest grassland. The ground cover has an important inhibitory effect on the process of rainfall erosion and sediment yield, especially in heavy rainfall. However, the horizontal tillage method can reduce the soil erosion under the conditions of light rainfall and strong rainfall. However, with the increase of rainfall intensity, The impact is also reduced.