不同覆土厚度对伊犁地区公路护坡植被质量的影响

为提高伊犁地区公路建设中的边坡植被防护质量，促进公路建设与生态环境的和谐发展，依托S242线巩留至尼勒克公路开展了实地边坡试验，利用灰色关联度的分析方法，对5 cm、10 cm、15 cm、20 cm四种表土回填厚度处理的边坡植被建植质量进行了研究。结果表明：随着覆土厚度的增加，公路边坡护坡植被质量逐渐增加，土壤砂粒减小了15%~23%，粉粒含量增加了18%~23%，土壤质地由壤土转变为粉砂质壤土；不同处理下的土壤孔隙度、土壤抗蚀指数、土壤抗冲系数差异显著，其对应的灰色关联度值分别为0.74，0.72，0.71，相比其他指标对护坡植被质量的影响更大；覆土20 cm小区的综合评判值G （k）最大（0.83），说明在本研究中覆土20 cm小区的护坡植被质量最好。

The Effect of Different Soil Thickness on Slope-protection Vegetation Quality in Ili Highway

In order to improve the quality of slope-protection vegetation in highway construction in Ili and promote the harmonious development of highway construction and ecological environment,the field slope test was carried out on the S242 highway from Gongliu to Nilka. The slope-protection vegetation qualities at different soil thickness were evaluated using grey correlation analysis. The results showed that with the increase of soil thickness,the slope-protection vegetation quality increased gradually. The soil sand content decreased by 15%~23%,and the silt increased by 18%~23%,which caused the soil texture to change from loam to silty loam. The soil porosity,soil erosion resistance index and soil anti-scouring were significantly different under different treatments,and the corresponding grey correlation values were 0.74,0.72 and 0.71 respectively. Compared with other indexes,the three indexes had a greater impact on the quality of slope-protection vegetation. The comprehensive evaluation value of the 20 cm plot is the largest (0.83),which indicates that the quality of slope-protection vegetation in the 20 cm plot is the best in this study.