不同植被配置对坡面土壤侵蚀的影响

The Effects of Soil Erosion with Different Vegetation Disposals in Slope

根据人工模拟降雨试验,在不同植被配置的坡面上,研究了黄土丘陵区坡面不同植被配置对入渗、产流产沙的影响。结果表明,在小雨强下,不同植被配置的稳渗率大小差别较大;随着雨强的增大,不同植被配置的稳渗率大小差别变小。不同雨强下,5种不同植被配置的坡面基本上都在5min内达到稳渗。不同植被配置坡面流含沙量均呈缓慢下降趋势。并且在小雨强下,不同植被配置坡面径流含沙量的下降趋势较为平缓;在大雨强下,累积产沙量曲线的斜率也越大。

Based on the artificial rainfall simulation experiments, on the slope face with different vegetation disposals, this paper studies the effects of different vegetation on the slope faces in the loess hilly regions upon the infiltration, runoff production and sediment yield. The results indicate that in the case of small rainfall intensity, there is a large difference in the steady infiltration rate of different vegetation disposal;and that with an increase in rainfall intensity, the magnitude of difference the steady infiltration rate among the different vegetation disposal becomes small. In the case of different rainfall intensities,the infiltrations on the slope face with 5 different vegetation disposal can reach the steady infiltration basically within 5 min. The sediment contents on slope face with different vegetation disposal tend to decrease slowly. Also, in the case of small rainfall intensity, the decreasing tendency of sediments in runoff on the slope face with different vegetation disposal appears to be flattish, and in the case of strong rainfall intensity,the sediment contents on the slope face with the belt vegetation disposal and the aggregated vegetation disposal appear to have the tendency of obvious fluctuation changes.