Evaluation Of Land Hongta District Ecological Security Against The Backgroud Of Urbanization

The rapid development of social economy and urbanization will lead to changes in regional land use patterns and structures,further affecting the value of regional land ecosystem services and having a significant impact on the land ecological security status.In order to clarify the main land ecological security issues facing Hongta District,promote the improvement of regional land ecological security and coordinate land ecological security with urbanization development.This paper takes Hongta District,which has experienced rapid urbanization,as the research object,and firstly measures the urbanization level of Hongta District from 2009 to 2018,and then analyzes the land use changes;then calculates the land ecosystem service values of Hongta District using the integrated modified equivalent factor method and the protection cost method;decomposes the land ecological safety system into four subsystems: resource,environment,economy and society,and The value of each individual ecosystem service of land is introduced into the evaluation system,so as to construct the evaluation system of land ecological security in Hongta District and calculate the value of land ecological security in Hongta District;the coupled coordination degree model is used to explore the level of coordinated development between land ecological security and urbanization,and finally suggestions and countermeasures are put forward.(1)Urbanization level.The urbanization level of Hongta District basically showed a yearly increase during the study period.The level of each subsystem has increased considerably,with different development rates,and the gap has gradually expanded and tended to be uncoordinated.The urbanization level of Hongta District roughly shows a core-edge characteristic,i.e.the urbanization level is high in Yuxing Street and Yudai Street in the central city,and the urbanization level is lower in other townships as the distance from the central city becomes more distant.(2)The value of land ecosystem service function in Hongta District.During the study period,the total value of land ecosystem services in Hongta District tends to decrease significantly,and only the value change of water supply shows positive growth.The most important source of ESV contribution is forest land,and the most important contributing areas are Chunhe Township and Luohe Township,with obvious differences in ESV in different regions.(3)Evaluation of ecological security of land in Hongta District.The overall land ecological security in Hongta District shows a fluctuating decline,and the subsystems of land ecological security show a differentiated development.The economic security system rises more;the resource system and environmental system security level declines with relatively large changes;the social system also declines to a certain extent.The level of land ecological security in Hongta District shows the characteristics of "high at the edge-low in the center",from the overall regional perspective,the low value of land ecological security is mainly distributed in the urban area,the farther away from the urban area,the higher the value of land ecological security.It is necessary to gradually improve the efficiency of resource utilization,control pollution and reduce the burden on the environment,use economic means to promote the level of land ecological safety,enhance the role of the land system in guaranteeing social development,rationalize the use of land resources and optimize the land structure.(3)Coupling and coordination of land ecological safety and urbanization in Hongta District The subtype of coupled coordination of land ecological safety and urbanization gradually evolves from the low level of barely coordinated development at the beginning of the study to the general level of intermediate coordinated development,and the subtype of coupled coordination changes from barely coordinated development-urbanization lagging to intermediate coordinated development-land ecological safety lagging,indicating that the level of urbanization and land ecological safety in Hongta District tend to be in a reasonable posture,but land ecological safety gradually lags behind.