Temporal-spatial evolution and influencing factors of ecological security in the city cluster of Yangtze River Delta
[Objective]The aims of this study are to explore the changing situation of ecological security in the city cluster of Yangtze River Delta,to elucidate the impact mechanism of ecological security in the city cluster of Yangtze River Delta,and to provide scientific support for the regulation and management of ecological security in the city cluster Yangtze River Delta.[Methods]A'health-risk-service'framework was constructed to comprehensively evaluate the ecological security status of the Yangtze River Delta city cluster from 2005 to 2020.Geographic detector and geographic weighted regression models were utilized to explore the relative importance and spatial heterogeneity of influencing factors.[Results](1)The ecological security status of the city cluster in Yangtze River Delta gradually improved from 2005 to 2020,with the comprehensive ecological security index increasing from 0.528 to 0.568.Spatially,it generally presented a pattern of higher security in the west and lower security in the east,with the Moran's Index changing from 0.292 to 0.322,indicating a strengthened spatial correlation between regions.(2)The Normalized Difference Vegetation Index was the dominant factor influencing the ecological security of the city cluster in Yangtze River Delta,with a high impact level of 0.753.The interactive effects among factors were stronger than the individual effects of a single factor.(3)The influences of various factors on the ecological security of the city cluster in Yangtze River Delta exhibited spatial heterogeneity.Natural factors and landscape factors had a greater impact on the southwest region,while human factors were concentrated in the central plains and eastern coastal areas.[Conclusion]The ecological security level of the city cluster in Yangtze River Delta had shown an overall good trend,and there were significant spatial effects among cities.Attention should be paid to the prevention and control of pollution sources,land planning and utilization,and cross-regional co-insurance and joint governance to help build a green and beautiful Yangtze River Delta.
ecological securitytemporal-spatial evolutionYangtze River Delta city cluster
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