Coupling Relationship Between Vegetation Vertical Space And Soil Stability Of Highway Slope In Hilly Region Of North Henan Province

The study of highway slope stability is great significance to explore growth and succession of the vegetation and ecological construction of the highway.But with the rapid development of economic and society,In the construction of highway excavation and backfill,inevitably it has a destruction of the ecological environment,the problems of soil erosion,vegetation restoration,and the loss of plant and animal habitats are increasing.In order to solve the problems.the paper used the analysis method of comprehensive utilization of correlation analysis and regression analysis,selected the hilly region Xin(Yang)nan(Yang)highway of Henan Province as the research object,and discussed the distribution patterns of native vegetation distribution patterns and the dynamic changes of the vegetation communities by using the correlation analysis and regression analysis in the hilly region of Henan Province,In order to provide scientific basis for the selection of the suitable root development of vegetation for solid or slope stability.In this paper,the following conclusions are obtained through the research and analysis of the relationship between the vertical space of hilly area in the southern of Henan Province:(1)With the change of vegetation growing season,diverse index(H),richness index(R),uniform index(G)are significantly increasing with the increase of the recovery period of growth and shady vegetation diversity index is significantly higher than that of sunny slope.Root biomass increased with replacement of the vegetation growing season and the biomass of root of different diameter decreases with the increase of soil depth,and the slope vegetation biomass is more than the uphill vegetation biomass.(2)Under different diameter grade,total root length diminishes with the increase of diameter class gradually.Root surface area and root volume have no obvious regularity.Total root length,root surface area,root volume,root density appear progressively decreasing trend with the soil depth deepened.Vegetation root tensile resistance and tensile strength under different slope position and aspect is difference,:the tensile resistance of vegetation roots on middle and downhill bit is greater than which is on uphill bit;the tensile resistance root tensile strength and root diameter of sunny slope vegetation are larger than shady slope;its irregular changes of tensile strength of taproot and lateral root;it shows significantly positive power function relationship between roottensile strength and diameter and significantly negative power function relationship between root tensile strength and diameter.(3)Soil organic matter,hydrolytic nitrogen(N),total nitrogen(N)and soil bulk density distribution tended to surface layer and decreased from the shallow layer to the deep layer.(4)It positively correlated between shear strength of root soil composite and the vertical load,with the increase of soil water content,the cohesive force is gradually reducing.(5)The characteristics of the vegetation community,the tensile properties of the root and soil nutrient were highly coupled,The vegetation coverage and soil moisture content are positively correlated,the same as the species diversity and the content of organic matter,the content of available phosphorus and the content of available nitrogen.Root volume,root density,root surface area,total root length,root tensile strength significant were correlated with soil hardness,soil bulk density and total porosity.