The Highway Ecological Sensitive Sections Topsoil Resources Collection And Utilization Technology Research

The construction and expansion of the expressway inevitably changed the function of the original land,especially in the highway construction of the topsoil clean-up process is often within the highway road area of surface tillage and surface vegetation completely cleared out.These cleared topsoil(including surface plant debris)are often considered to be wasted in the construction of roads,forming new spoil sites,occupying land,affecting landscapes,and are prone to new soil erosion,regional vegetation,soil And other elements of the ecological environment also have adverse effects.In addition,highway construction to clean up the topsoil is often rich in native plant seed resources and soil microbial resources.The soil humus,organic matter,NPK nutrient content in the soil fertile land is of great value and can be used as a valuable resource for protecting the local species and accelerating the ecological restoration of the slope vegetation.At present,the utilization of topsoil resources in highway construction in our country is relatively low,mainly due to the lack of a set of technologies for the collection and efficient use of topsoil resources in different regions.The topsoil composition in South China is complex and varies greatly with the area.In order to better classify and utilize the topsoil resources,it is necessary to carry out the research on the technology of collecting and utilizing the surface topsoil resources according to the characteristics of topsoil resources of different soil types.In this study,through the sampling analysis of topsoil in different sections along the line,the characteristics of seed bank and soil nutrient analysis,according to the characteristics of high-speed cloud environment and project construction,put forward the corresponding environmental protection type clear construction technology,clear construction of the reasonable vegetation and Topsoil resources protection and collection work to reduce the impact on the environment and destruction.According to the characteristics of topsoil resources along the line,the paper put forward the basic principles and quality grading standards of topsoil reuse in order to reach the scientific and reasonable utilization of topsoil resources.At the same time,put forward the technology of local topsoil spraying and direct utilization,which can directly guide the engineering practice.At the same time,the "Guideline for Topsoil Protection,Collection and Utilization of Qingyun Expressway" has been drawn up.The guideline has unified and standardized the collection and utilization of topsoil across the board,facilitating management and providing technical support for surface soil collection and utilization in the province.By using the topsoil for the greening along theslope of the expressway,the greening of the abandoned spoil area and the greening of the filling area have reached the expected results.This study will have very important practical significance and social and economic benefits for the construction of a green cycle low-carbon highway.