通过在道路边坡进行植物防护和原位剪切试验，研究了不同植被防护措施对边坡抗剪强度（τ）影响。结果表明，植被根系随土壤深度增加而减少，表层（0~10 cm）根系长度密度（Root length density, RLD）占总RLD的34%~78%；植被根系含量及盖度与土壤水分含量（Soil water content, SWC）呈指数正相关。表层（0~10 cm）土壤抗剪强度主要受植被根系及盖度影响，随着根系长度密度（RLD）、根系重量密度（Root weight density, RWD）、植被盖度（Vegetation cover, VC ）增加呈指数形式增大。30 cm深度土壤抗剪强度值显著低于10 cm值和50 cm值。随着土壤深度增加，土壤容重和水分对抗剪强度影响力增大，在50 cm处两者分别与抗剪强度呈线性正相关和指数负相关关系。
To study effects of roadside slope vegetation restoration on shear strength (τ) of and surface soil loss from the slopes, seven vegetation restoration models were adopted in in-situ shearing tests. It was found that vegetation root systems decreased in density with increasing soil depth, the root length density (RLD) in the 0~10 cm soil layer accounted for 34%~78% of the total RLDAnd the vegetation root magnitude was positively related to soil water content (SWC) showing a exponential function correlation. Shear strength of the surface soil layer (0~10 cm) was mainly affected by vegetation root systems and vegetation coverage and increased as a exponential function of RLD, root weight density (RWD) and vegetation cover (VC ). The controlling factors on τ varied with soil depth, and regression analysis showed RLD, RWD and VC had statistically significant effects on τ in the 10 cm soil depth. However, none of the predominant factors on τ were founded in the 30 cm soil depth, which was so defined as a transition layer and was the lowest shear strength τ as compared with the 10 cm and 50 cm soil depths. The influence of soil bulk density (ρ) andSWC got bigger on τ with soil depth, showing a positive linear relationship and a negative exponential function relationship, respectively in 50 cm soil depth.
刘窑军,王天巍,蔡崇法,翟 杰.植被恢复对三峡库区土质道路边坡抗剪强度的影响[J].土壤学报,2013,50(2):396-404. DOI:10.11766/trxb201204300153 Liu Yaojun, Wang Tianwei, Cai Chongfa, Zhai Jie. Effect of vegetation restoration on soil shear strength of roadside slopes of unpaved roads in the Three-Gorges Reservoir Area[J]. Acta Pedologica Sinica,2013,50(2):396-404.复制