草原公路路基高度变化对其水土保持功能的影响

Effect of Subgrade Height Variation of Grassland Highway on Soil and Water Conservation Features

通过对典型草原公路工程开展调查观测，选择边坡土壤含水量、土壤流失量和植被覆盖度为指标，探讨不同路基填筑高度对边坡水土保持功能的影响。结果表明，考虑土壤含水量状况和植物固土功能的最优性，草原公路路基设计高度取值建议在1．0～2．5m之间。采用一定防护措施的低路基设计方案，能够有效降低草原公路边坡土壤流失，保存水分，提高植被恢复状况。

This paper discussed the effect of subgrade height variation on soil and water conservation fea- tures of road slopes through investigating typical grassland highway project, which chose soil moisture con- tent, soil erosion and vegetation coverage as standard. The results showed that considering optimal fea- tures of soil moisture content and plant soil conservation, the subgrade design height of grassland highway was recommended ranging from 1.0 to 2.5m. Adopting low subgrade design with certain protective mea- sures could reduce soil erosion of grassland highway slope effectively, and keep soil moisture and in- creased vegetation restoration.