摘要：The vegetation concrete eco-restoration technology is a slope restoration technique used to strengthen slope stability and restore slope vegetation. The key issue in the entire technique is the composition of vegetation concrete suitable to the slope stability and re-vegetation. The objective of this study is to determine the appropriate cement content in vegetation concrete in the application of vegetation concrete eco-restoration technology. A series of systematically designed experiments were conducted on Cynodon dactylon and Medicago sativa with different cement content treatments to assess the effects of cement on the soil physico-chemical properties, enzyme activities and microbial biomass. The soil organic matter (SOM), soil total nitrogen (TN), enzyme activities and microbial biomass were significantly lower in high cement content treatments. A multi-index fuzzy comprehensive evaluation model was established to calculate the SBAI value, which can comprehensively evaluate how soil enzyme and microbial biomass characterized the quality change under different cement contents. The SBAI values of high cement content vegetation concrete were smaller than those of low cement content. Moreover, the SBAI value declined sharply when cement content reached 8%. And the SBAI values of unplanted sites were smaller than planted sites. The research found the quality of vegetation concrete reduced remarkably when cement content exceeded 8%. The 4-8% cement content appeared to be the appropriate range of cement content in vegetation concrete for the two studied species when plant growth and soil quality be taken into account.
