Research On The Ecological Security Evaluation Of Land In Hefei Based On RS/GIS

Land resources are not only the cornerstone of social and economic growth but also an important part of the ecosystem and a resource needed for human life and development.Sustainable utilization of land resources can guarantee sustainable social and economic development.Urban land ecological security is a key factor for the sustainable utilization of urban land resources and an important part of building an ecological country.In order to analyze the land ecological security of Hefei City,firstly,we analyzed the spatial and temporal,quantitative change characteristics and driving factors of land use/cover change in Hefei City from 2005 to 2020 by using RS and GIS technology,then we established the DPSIRM model evaluation index system,calculated the index weights of land ecological security of Hefei city by using entropy weight-variable weight theory,and used the comprehensive index method to calculate each The evaluation value of each indicator,subsystem and year was calculated by using the comprehensive index method for systematic analysis.Finally,the corresponding countermeasures are discussed for each research result.The results of this study are as follows:(1)From 2005 to 2020,the most important type of land use in Hefei City is arable land,with the area of arable land decreasing year by year and mainly transforming into construction land,followed by water bodies and forest land;the area of urban construction land increases year by year,with an increase of 577.02 km2 during the period,and the proportion of which increases by 5.03%,occupying more and more ecological land.(2)The five indicators that have a greater impact on land ecological security in Hefei City are urban residents’ living area per capita,effective irrigation area to arable land area ratio,fertilizer application per unit of arable land area,the proportion of tertiary industry to GDP and afforestation area;the pressure subsystem has the greatest impact on land ecological security,followed by the response subsystem,and the state subsystem is in the third place.(3)The development of land ecological security in Hefei is mainly influenced by the driving forces of population growth,economic development,and policy planning;the increase of ecological land area can improve urban land ecological security,while the opposite is true for the increase of construction land area;the land ecological security level in Hefei is less secure and insecure from 2005-2013 and turns to critical security from 2014-2020,and the land ecosystem The quality of land ecosystem has been gradually improved,but the carrying capacity of land resources at the existing stage is still loaded.(4)In order to reconcile economic development and land ecological security and promote regional sustainable development,it is necessary to implement land planning,pay attention to arable land protection,control the population,improve vegetation cover,control industrial pollution,enhance environmental awareness,improve laws and regulations,and upgrade the industrial structure from both natural and human factors in a two-pronged joint effort.Figure [17] Table [22] Reference [140]...