Land Use Change And Ecological Security Evaluation In Datong City

Land is not only the basic resource for human survival and development,but also an important component of natural ecological system.Land use is related to human reproduction ? habitat and the sustainable development of the society as a whole.However,in recent years,with the increasing frequency of human activities and the deepening of land intervention and development,there are more and more ecological problems arising from land use changes,which greatly affect and restrict regional development.Based on the relevant concepts of land use change and land ecological security and domestic and foreign research,this paper selects Datong in Shanxi Province as the research area to study and analyze the land use change and land ecological security in Datong from 2009 to 2016.Based on the calculation of the land use data of Datong in three time periods,this paper studies and analyzes the changes in the number(structure),dynamic changes and degree changes of various classes in Datong.Based on PSR model,after considering the influences of society,economy and environment,an evaluation index system of Datong land ecological security is established,and the comprehensive index of Datong land ecological security at four important nodes of 2009,2012,2014 and 2016 is obtained,so as to analyze and study the overall level and change of Datong land ecological security.The main research information is as follows:(1)From 2009 to 2016,the overall adjustment of land use structure in Datong was greatly,and the change trend gradually changed from fast to slow with the passing of time,and the development degree of land became increasing.Specifically,although cultivated land,forest land and grassland are the main land use types in Datong,the usable area of these three types of land is decreasing constantly.Although the trend of decline slows down in the later period,it still does not affect the trend of overall land use in Datong being inclined to urban construction land and transportation land.Although the land area of the garden is also decreasing,the change range is small,accounting for a relatively small proportion in the total land area of Datong,which is not obvious.Other land area has fluctuation change,whole change is not big.(2)After analysis and demonstration,urban development level,agricultural development level,various kinds of pollution caused by development,changes in land types with ecological adjustment functions such as green land and cultivated land,and human response to ecological problems are all important factors affecting Datong's ecological security.From 2009 to 2016,the overall ecological security comprehensive value of Datong showed a gradual upward trend,but it has been at risk level and sensitive level.Although it has sustainable development capability to a certain extent,its ability to resist external interference is still weak,and better planning and ecological protection measures are needed.(3)According to the analysis results of land ecological security and based on land use,in order to further improve the level of land ecological security in Datong and realize the coordinated and sustainable development of regional social economy,the following four countermeasures and suggestions are put forward: 1.Strictly protect cultivated land and optimize the layout of farmland;2.Strictly control the construction land and realize economical and intensive use of land;3.Intensify land consolidation,expand reserve land and improve land ecology;4.Delineate the red line of ecological protection to realize hierarchical control of different land types.