Zhang Qiang, Zheng Shi-qing, Tian Feng-xia, Ma Chun-yan
College of Resources and Environment, Northwest A & F University, Yangling 712100, Shaanxi, China.
Ying Yong Sheng Tai Xue Bao. 2010 Jul;21(7):1785-91.
A laboratory simulation test with slope-adjustable steel tank and artificial rainfall was conducted to study the runoff and sediment processes of uncovered and Poa pratensis L.-planted earth roads, and the anti-erosion effects of P. pratensis-planted earth road. At the same rainfall intensity and slope, the runoff coefficient of P. pratensis-planted earth road was larger than that of uncovered earth road. For the two kinds of earth roads, their runoff coefficients all increased with increasing rainfall intensity and slope. At the same slope but different rainfall intensity, the runoff coefficient had a logarithmic relationship with rainfall duration, and a quadratic relationship with slope or rainfall intensity. Soil erosion rate increased with increasing rainfall intensity or slope, and was smaller on the P. pratensis-planted earth road at the same rainfall intensity. The average antierosion efficacy of P. pratensis-planted earth road was 47.22% at different rainfall intensity, and was 26.24% at different slope. Because of its higher roughness and higher road surface resistance coefficient, P. pratensis-planted earth road had a lower sediment yield and a decreased sediment transport.
利用可调节坡度的钢槽和人工降雨进行了室内模拟试验，研究了裸地土路和种植草地早熟禾的土路的径流和泥沙过程，以及种植草地早熟禾土路的抗侵蚀效果。在相同降雨强度和坡度条件下，种植草地早熟禾土路的径流系数大于裸地土路。对于两种土路，其径流系数均随降雨强度和坡度的增加而增大。在相同坡度但不同降雨强度条件下，径流系数与降雨历时呈对数关系，与坡度或降雨强度呈二次关系。土壤侵蚀速率随降雨强度或坡度的增加而增大，在相同降雨强度下，种植草地早熟禾土路的土壤侵蚀速率较小。在不同降雨强度下，种植草地早熟禾土路的平均抗侵蚀效能为47.22%，在不同坡度下为26.24%。由于种植草地早熟禾土路的粗糙度较高且路面阻力系数较大，其产沙量较低且输沙量减少。
