Community characteristics of ecological slope protection under mixture planting of shrub and herbage after ten years in Bitong expressway

Authors Chen Shengyi; Cheng Ziqiao; Peng Ahui; Chen Dongqin; Dong Shikui; Ma Chuang; Zhang Xiangfeng; Chen Pan

Journal Guihaia , ,:

Abstract The formation of stable community is the objective of ecological protection in highway slope. In order to explore the community characteristics in highway slope ecological engineering after ten years''succession,the species composition, plant life forms,and species diversity index were investigated through building natural restoration,the monoculture of Cynodon dactylon and five kinds of mixture planting of shrub and herbage on typical slope of Bitong Expressway. The results were as follows: (1) Plant community succession after ten years,a total of 52 kinds of plants appeared in the survey sample plots,belonging to 17 families and 49 genera; and a total of 26 genra and 29 species of Compositae,Leguminosae,Gramineae accounted for 55.77% of the total,which showed that these three families played important roles in the process of vegetation succession in the restoration of vegetation. (2) Among the restoration methods,the proportion of perennial plants was higher than that of annual herbs. (3) In the mixture planting of shrub and herbage treatment,the Patrick index,Shannon- Wiener index,Simpson index and Margalef index of reforestation communities tended to increase first and then decreased with density,and reached the peak when the seeding rate of herbage was 500 plants·m~(-2). (4) The growth of mixture planting of shrub and herbage was superior than that of monoculture of herbage and natural recovery. (5) Seeding density had no serious effects on the aboveground biomass and species diversity index of community. Considering the cost and benefits of side slope protection,the initial seeding density of 500 - 600 plants·m~(-2) can build a stable plant community on highway slope with good protective effects. It can be applied to slope ecological restoration projects in similar area.

Species covered 狗牙根 Cynodon dactylon