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为了揭示路基边坡草灌植被护坡作用的本质,提高生态防护效益,2005-2008年选择路基边坡不同土壤类型和草灌植被为研究对象,利用野外径流小区法和数据分析,结果表明:1)确定了项目区的侵蚀性降雨指标;2)确定了降雨侵蚀力被草灌植被消减的量化方法,揭示了植被覆盖度在其中所起的决定作用;3)不同土壤类型边坡植被消减降雨侵蚀力效果。砂姜黑土:紫花苜蓿95.8%、高羊茅95.4%、紫穗槐93.2%、狗牙根89.6%、小叶扶芳藤82.3%;黄黏土:紫穗槐93.9%、紫花苜蓿91.4%、高羊茅90.7%、小叶扶芳藤85.8%、狗牙根83.1%;粉砂土:高羊茅96.1%、紫花苜蓿94.7%、狗牙根94.6%、紫穗槐93.8%、小叶扶芳藤83.2%。研究对路基边坡生态防护具有实际指导作用。
In order to reveal the nature of slope revetment function and improve the ecological protection benefit of subgrade slope grass planting, different soil types and grassland irrigation were selected as the research object in 2005-2008. Using field runoff plot method and data analysis, the results show that: 1 ) Determined the erosive rainfall index in the project area; 2) determined the quantification method that the rainfall erosivity was reduced by the grass irrigation, revealed the decisive role played by the vegetation coverage in it; and 3) the rainfall reduction on the slope vegetation with different soil types Erosive effect. Shajiang black soil: Medicago sativa 95.8%, tall fescue 95.4%, Amorpha fruticosa 93.2%, bermudagrass 89.6%, Euonymus japonicus 82.3%; yellow clay: Amorpha fruticosa 93.9%, alfalfa 91.4%, tall fescue 90.7%, Euonymus japonicus 85.8%, bermudagrass 83.1%; silt soil: tall fescue 96.1%, alfalfa 94.7%, bermudagrass 94.6%, Amorpha fruticosa 93.8%, Euonymus japonicus 83.2%. Research on the ecological protection of subgrade slope has a practical guidance.