8种灌木根系分布对高速公路生态边坡的影响

从宁常高速公路生态边坡选择8种灌木，研究其根系垂直分布和对边坡的影响。结果表明：在固土效益方面，有灌木覆盖土壤的有机质含量和水稳性指数均大大提高，增强了边坡的稳定性。综合比较表现较好的有紫穗槐、伞房决明和海桐，月季、金丝桃表现其次，红叶石楠、木芙蓉和狭叶十大功劳的固土护坡能力稍低。在根系吸收效益方面，海桐细根表现最好，其次为金丝桃、狭叶十大功劳、伞房决明和木芙蓉，紫穗槐、月季及红叶石楠表现稍差。因此，在较陡的高速公路生态边坡，宜选择固土护坡能力较强紫穗槐、伞房决明、海桐等，在较缓的高速公路边坡，可以结合防护功能和景观功能进行灌木的选择和配置，在较为贫瘠的边坡选择具有较好吸收效益的海桐、金丝桃、狭叶十大功劳、伞房决明等灌木，能一定程度上提高护坡的综合效益。

Influence of eight species shrubs' roots distribution on the ecological slope of highway

Eight species shrubs were chosen from the ecological slope of Ningchang Highway to study the vertical distribution of these shrubs' roots and their effect on the slope.From firm soil effectiveness aspect,it showed that the organic contents and moisture stability index of the soil with shrubs increased significantly,which improved stability of the slope.Amorpha fruticosa,Cassia corymbosa and Pittosporum tobira performed relative better compared with other species;followed by Rosa chinensis,Hypericum chinensi...