护岸柳树表层根系水土保持效果

Soil and Water Conservation Effect of Superficial Roots of Revetment Willow

选取北京市怀柔区琉璃河示范区试验河段,采用野外人工模拟降雨的方法对几种不同地表的坡面侵蚀状况进行研究,以探讨3种不同土壤生物工程措施下柳树表层根系的水土保持效果。结果表明:与裸露岸坡相比,扦插、篱墙和灌丛垫地表状况下产流产沙量均明显减少,扦插措施下坡面累积径流量为裸露岸坡的30.62%,产沙总量为裸露岸坡的33.90%;篱墙措施坡面累积径流量为裸露岸坡的17.11%,产沙总量为裸露岸坡的25.80%;灌丛垫措施坡面累积径流量为裸露岸坡的13.32%,产沙总量为裸露岸坡的20.60%,表明柳树表层根系的生发能够起到有效减少坡面侵蚀的效果。在3组不同降雨强度的作用下,灌丛垫拦截径流和减少产沙效果最好,篱墙次之,最后为扦插。

The Liuli River in Huairou district of Beijing was selected to study the erosion state of slope with different surfaces by means of artificial simulated rainfall in order to explore the water and soil conservation effect of superficial roots of revetment willow under 3different soil bio-engineering measures.The results showed that compared with the bare slope,the runoff and sediment yield decreased obviously under the surface condition of cuttage,fences and shrub.Under the measures of cottage,slope surface cumulative runoff amount and total sediment yield were respectively 30.62% and 33.90% of those of bare slope;under the measure of fences,the cumulative runoff amount and total sediment yield on slope surface were respectively17.11% and 25.80% of those of bare slope;under the measure of shrub,the cumulative runoff amount and total sediment yield on slope surface were 13.32% and 20.60% of those of bare slope,respectively.It showed that the superficial root system of willow could reduce slope erosion effectively.Under 3different rainfall intensities,shrub showed the best effect of intercepting runoff and reducing sediment,followed by the fences and the cottage.