Stability analysis of the vegetation community in the Zheng-Xin section of the Beijing-Hong Kong-Macao Highway slope

The habitat of highway slope is special, and the vegetation community plays a key role in slope stability. It is necessary to know the stability of the vegetation community on highway slope that have recovered for more than 20 years and provide a theoretical basis for slope landscape improvement. Ten typical vegetation communities on the Zheng-Xin section of the Beijing-Hong Kong-Macao highway were used as research objects. Three types of indicators, community productivity, soil fertility, and vegetation community species diversity, which included 13 factors, were analyzed using the membership function method. The results showed that the highest species diversity index was in Yuandi B. payrifera, the highest biomass index was in Guandi B. payrifera, and the Zhangdi U. pumila + A. fruticosa had the highest biomass index. The order of stability of the vegetation communities was Guandi B. payrifera > Guandi U. pumila + A. fruticosa > Zhangdi A. fruticosa + P. sepium > Zhangdi U. pumila + A. fruticosa > Zhangdi B. payrifera + A. fruticosa > Yuandi B. payrifera = Yuandi S. viridis + A. fruticosa > Yuandi H. scandens + B. payrifera > Guandi A. fruticosa + A. annua > Zhangdi A. fruticosa. The results show that the vegetation communities that contain arbor have high stability in the three vegetation communities with a higher stability order. A. fruticosa exists in every vegetation community where the community structure is shrub + herb, and the higher the diversity of the shrub layer, the higher its stability.