Study On Urban Ecological Security Assessment And Spatial Relationship Based On GIS

with the continuous development of human society,productivity and science and technology improve,and more and more natural resources are being sought,resulting in resource depletion,soil erosion,air pollution and other ecological problems,which seriously affect our living environment and restrict our development.At present,the urban ecological environment is getting worse and worse.The problem of ecological security has attracted worldwide attention.A large number of studies have found that ecological safety is the foundation of sustainable development,the core of ecological security evaluation,and the quantitative understanding of regional ecological security level.The study of ecological security assessment can provide data support for the sustainable development of the city,and it is of great significance for the healthy development of the city.The factors influenced city ecosystem environment and social status in response to environmental pressure,three elements,using pressure state response model to establish the evaluation index system of ecological security of Sichuan Province,and based on the national standard or after a large number of experts scholars recognized the value as the basis for evaluation.Based on the calculation of Euclidean proximity degree of cities,grading and grading of all cities in Sichuan province were carried out,and the spatial autocorrelation analysis was carried out by using geoda.(1)According to the present situation of ecological security research at home and abroad city,Sichuan Province,give full consideration to its own characteristics,regional differentiation theory,put forward the pressure state response of ecological security evaluation system for the city of Sichuan Province Based on the model,the city ecological security is analyzed and illustrated for the three aspects of environment and social status in response to environmental stress.(2)According to the principal component analysis method in common factor variance of index selection,using principal components cumulative contribution amount of weight is determined by calculating the Euclidean closeness degree to calculate the ecological security of Sichuan province showed that the evaluation value,from 2010 to 2015,only Chengdu is the level of security,four,Deyang,Zigong city Mianyang,Yibin from the critical security level has dropped to a safe level,the rest of the city are always in relatively unsafe level,the present situation of the ecological security level,Sichuan province is not optimistic.(3)The use of geoda software in Sichuan province were found spatial autocorrelation analysis,the status of ecological security in Sichuan Province in central city are higher than other city,city ecological security status of city ecological security status of Deyang,Mianyang,from Chengdu,Zigong,Yibin,more than in the distance above the city far away,that is positive correlation between ecological security and ecological security is better city distance distance.(4)To analyze the status of each year and find out the index limiting the level of ecological security in Sichuan based on the evaluation criteria,there are third industry GDP,third industry employment population,urbanization rate and green built-up area.(5)According to the analysis results,combined with the current situation of all levels of cities in Sichuan Province,this paper puts forward suggestions for readjustment of industrial structure,construction of good living environment and linkage development between cities.