关键词: 植被毯, 公路边坡, 人工降雨, 保水效益

Abstract: [Objective] The aim of the study was to compare the water retention capacity between vegetation carpets with different materials and quantities.This can provide a basis for effective use of side slope vegetation carpet technology. [Method] The artificial rainfall system of lateral spraying was used to simulate rainfall.The experimental had several vegetation carpet types with different quantities (100-500 g/m²) and materials (wheat straw and coconut fiber) and the control group was the slope without any measures.The runoff volume and infiltration were measured during different periods. [Results] There were significant differences in slope runoff between the experimental and control groups.The slope runoff of vegetation carpets were significantly lower than that of the control slope but the opposite was true for infiltration.The vegetation carpet of wheat straw had a better infiltration performance compared to the coconut fiber.The vegetation carpet of wheat straw within 300 g/m² had the most prominent water retention effect among the same material but the water retention was the best for coconut fiber within 200 g/m². [Conclusion] Vegetation carpets have significant effects on water retention;the water retention benefit varied from different materials and quantities;the vegetation carpet of wheat straw fiber (300 g/m²)is recommended in construction.

Key words: vegetation carpet, road slope, artificial rainfall experiment, water retention benefit