Study on the Spatial and Temporal Evolution of the Ecological Vulnerability of Cities along the Yangtze River
With the acceleration of urbanization in the Yangtze River Basin,the contradiction between resources and the environment is highlighted,and the reduction in ecological and environmental vulnerability has become an important way for cities along the river to achieve high-quality development.The spatial differences in the ecological vulnerability of cities along the river are not conducive to the synergistic development of the Yangtze River Economic Belt.Therefore,a scientific assessment of the ecological vulnerability of cities along the river and exploration of its spatial and temporal evolution patterns,and coping strategies can help the overall high-quality development of cities along the river.Existing literature mostly adopts intuitive horizontal comparison and spatial autocorrelation analysis to study the spatial and temporal clustering characteristics of vulnerability.It is a challenge to further explore the spatial and temporal evolution of vulnerability and quantify the spatial spillover effect of vulnerability.In view of this,based on the theoretical analysis framework of vulnerability"exposure-sensitivity-adaptability",this paper constructs an urban ecological environment vulnerability index system from the dimension of the coupled system of city,society and nature,and utilizes the"layer by layer vertical and horizontal"gearing method,the Kriging interpolation,Kernel density estimation and Markov chain,to systematically investigate the spatial and temporal characteristics and evolution of the distribution of ecological environmental vulnerability of cities along the Yangtze River from 2013 to 2018.Based on the analysis results,the following conclusions can be drawn:1)during the sample period,the ecological environmental vulnerability of cities along the Yangtze River in the upper,middle and lower reaches of the river is characterized by non-equilibrium spatial differentiation,which is stable,active and weakened,respectively;2)the ecological environmental vulnerability of cities along the Yangtze River as a whole is in a declining trend,and regional differences are the main influencing factors for the expanding trend of vulnerability differences;3)the vulnerability as a whole is not mobile and has the characteristics of"club convergence"and"clubs convergence".The overall mobility of vulnerability is not strong and has the characteristics of"club convergence";4)spatial factors have a significant impact on the transfer of ecological environment vulnerability,and an effect of"polarization neighborhood stabilization".Based on the above conclusions,this paper suggests:1)Implementing gradient regional policy instruments.Each region should implement policy instruments according to local conditions to ensure the synergistic development of cities along the river.2)Promoting the accelerated downgrading of heavily vulnerable cities.Heavily vulnerable cities in the middle and lower reaches of the river should be accelerated and downgraded,so that the ecological vulnerability of the cities along the river will be converged to a lower level as a whole.3)Strengthening the radiation role of mildly vulnerable cities.On the one hand,we should actively guide the establishment of cooperation platforms between mildly vulnerable cities and neighboring cities;on the other hand,we should build a cross-space complementary system with heavily vulnerable cities to realize a win-win situation for the development of cities along the river and protect the ecological environment.
vulnerabilityurban ecological environmentspatial and temporal differentiationevolution
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