Study On Land Ecological Security Evaluation In Guanzhong Region Of Shaanxi Province

Land ecological security is the basis and premise for the region to achieve green sustainable development and ecological civilization construction.Faced with the rapid urbanization and industrialization process,human-land conflicts and ecological and environmental problems are increasingly prominent,and land ecological security is facing increasing threats.Therefore,it is very important and urgent to carry out land ecological security evaluation to grasp the changing laws and status of land ecological security,and it has also been a hot research issue in the field of land science.In this study,the Guanzhong region of Shaanxi Province was used as the research area.The DPSIR model was used to build an evaluation index system.19 evaluation indexes were selected from five aspects: "driving force-pressure-state-influence-response",and the entropy weight method was used to confirm the weight.The index method is used to calculate the land ecological security index.The assessment and analysis of the state of land ecological security in the Guanzhong region from 2009 to 2018,and the analysis of the land ecological security situation in the five cities and one district of the Guanzhong region in 2018,the main conclusions are as follows:(1)From 2009 to 2018,the overall state of land ecological security in Guanzhong has improved,but as of the end of 2018,it is still in a state of critical security.Most years have been in a state of critical security.Only 2015 was in a safer state.The overall level of security is low.(2)Judging from the land ecological security status of various subsystems in the Guanzhong region from 2009 to 2018,the driving force subsystem index and the impacting subsystem index showed an overall upward trend.At the end of 2018,the driving subsystem index reached a safe state,and the impacting subsystem reached In a safer state,the pressure subsystem index and the state subsystem index showed a downward trend as a whole.At the end of 2018,the pressure subsystem changed to a critically safe state,and the state subsystem changed to an unsafe state;the response subsystem index decreased first and then increased,and the end of 2018 Change to a critical safety state.(3)In 2018,the land ecological security index of five cities and one district of Guanzhong region is ranked from high to low: Xi’an City> Baoji City> Tongchuan City> Xianyang City(including Yangling District)> Weinan City,Xi’an City and Baoji City are in a relatively safe state,Tongchuan City and Xianyang City(including Yangling District)are in a critical safety state,and Weinan City is in a less secure state.(4)According to the evaluation results,the obstacle factor diagnosis model is introduced to analyze the main factors restricting the improvement of the land ecological security status in Guanzhong area from the criterion level and the indicator level,and put forward countermeasures and suggestions for improving the land ecological security status in Guanzhong area.