Dashiqiao city is an important magnesium mine and magnesium products production base in China.It has rich mineral resources and superior mining conditions.On the one hand,the economic development of Dashiqiao City benefits from the development of mineral resources and the vigorous development of related industrial enterprises.On the other hand,the urban ecological environment of Dashiqiao city is also seriously threatened.Due to the characteristics of low density of metal dust,mineralization occurring on the surface of mountains,alkaline associated minerals and open-pit mining,the ecological environment problems caused by mining of mineral resources in Dashiqiao City are as follows:wide and long-lasting air pollution,serious soil pollution,and surface vegetation regression.And geological conditions are fragile.Therefore,in order to improve the ecological environment of Dashiqiao City,it is very important for the ecological restoration of damaged areas.With the concept of "ecological restoration,urban repair,put forward in the field of urban and rural construction,related work has been carried out throughout the country,but most of the traditional ecological restoration work is based on specific single-point projects,single-point ecological restoration project is lack of systematicness,single project does not form a complete organic whole,therefore The macro-objective of urban ecological environment is insufficient,so the ecological benefits of the project-led ecological restoration project have certain limitations.This paper puts forward the concept of "urban ecological restoration planning,and constructs the theoretical framework of urban eeological restoration planning,including its basic theory,basic meaning and target system.On this basis,the method of urban ecological restoration planning should firstly make an assessment of the ecological security status of the city as a whole and identify the main ecological sensitive areas of the city as the research focus of urban ecological restoration planning,so as to more targeted urban ecological restoration planning related work.On this basis,the ecological environment risk and the scope of risk impact are analyzed in detail.The ecological restoration zoning is divided into conservation type,recreation type,production type and construction type.Finally,according to the status quo of construction and development of the study area,according to the evaluation of different ecological restoration zones,using different urban ecological restoration methods,the spatial pattern of urban ecological restoration planning is constructed,and the strategies and suggestions of urban ecological restoration planning are put forward.Through the analysis of the general situation of Dashiqiao City and the field investigation,the main factors of the ecological environment damage of Dashiqiao during the mining and production of mineral enterprises are identified.According to the characteristics of magnesia mining area,soil erosion sensitivity,landslide sensitivity,ecological value,soil pollution degree and air pollution degree were selected as the evaluation factors of urban ecological security status.GIS and other relevant spatial information technology were used to evaluate them,and the ecological environment damage under different factors was analyzed.The main ecological sensitive area of Dashiqiao City is the central part of Dashiqiao City,which includes the areas with serious ecological environment damage mainly including the central city area and the concentrated mining area of Nanlou,and is regarded as the main research area of urban ecological restoration planning.In view of the scope of the study area,the evaluation model of ecological restoration zoning was constructed to identify the urban ecological restoration zoning based on the degree of ecological importance and the resistance level of landscape connectivity.According to the current situation,the key points of the urban ecological restoration planning of Dashiqiao City are the construction of the isolated area between industrial and mining enterprises and urban living space,the ecological construction of Panlong Mountain and Baihu Mountain,the connection of regional water system based on mud river and the construction of Urban Ventilation corridor.In view of the above problems,the planning strategy of urban ecological restoration planning in Dashiqiao City is put forward,and suggestions are put forward for ecological restoration of mines.The urban ecological environment problems in Dashiqiao City can be solved systematically from the source of ecological damage to the areas affected by ecological damage. |