路基边坡草灌植被消减降雨侵蚀定量分析

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。

Quantitative analysis of effects of grass-shrub vegetation in decreasing rainfall erosion on subgrade slope

To explore the action nature of grass-shrub vegetation and to increase the benefits of ecological protection of grass-shrub vegetation on subgrade slope,different soil types and vegetation types on subgrade slope were selected and three year experiment was performed from 2005 to 2008.The action nature was studied based on the field runoff-plots and data analysis.The results are as follows:1)The standard of erosive rainfall was determined in the project area;2)A quantitative method for rainfall erosion force...