Improvement of difficult green space under urban viaduct,taking the green space under Fengyan Road viaduct in Shenzhen City as an example
The study focused on the difficult green space under Fengyan Road viaduct in shenzhen city,using self-developed soil amendments to improve the soil quality,and planting three commonly used shade plants,namely Heptapleurum arboricola,Excoecaria cochinchinensis,and Fatsia japonica,to analyze their adaptability.The results showed that the soil pH decreased from 8.3 to 7.6,and the bulk density decreased from 1.42 g·cm-3 to 1.27 g·cm-3 after soil improvement.There was also a significant increase in soil organic matter,available nutrients,and related soil enzyme activities(P≤0.05).According to the adaptable plants selection test,the survival rate of H.arboricola remained above 98%after 4 months,and the coverage increased from 57%to 87%.The survival rate of 4-month F.japonica is 80%,with no significant improvement in coverage rate.2 months after planting,the survival and coverage rate of E.cochinchinensis decreased to 22%and 14%,respectively,while after 4 months,they were only 18%and 8%,respectively.Analysis of root traits revealed that the rooting depth and root biomass of H.arboricola were significantly higher than those of E.cochinchinensis and F.japonica(P≤0.05),with E.cochinchinensis having the lowest root biomass.In general,H.arboricola performed best in the green space under Fengyan Road viaduct,and can be furtherly promoted in combination with soil improvement techniques.
green space under viaductsoil improvementadaptable plants
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