Study On Urban Resilience Of Hohhot Based On "Size-Density-Morphology"

The research of resilient city is one of the important premise and core contents of urban sustainable development.To measure Hohhot toughness development status,this paper USES the social and economic statistical data,remote sensing image data and the data of land use,can using the multi-factor comprehensive analysis and the value of ecological footprint method,such as "scale-density-form" urban resilience research framework,the measuring scale of Hohhot in 1991-2019,density,toughness index,Using polygon method to calculate urban comprehensive toughness;Using spatial analysis and statistical analysis,the evolution of time series and spatial pattern of Hohhot county resilience was analyzed.The impact of different factors on urban resilience was explained using geographic detectors.The following research conclusions are drawn:（1）the scale resilience index decreases under the development state of high scale resilience.Suitable construction land area is wide,conducive to urban expansion.From 1991 to 2019,Hohhot was in a state of high scale resilience.Among them,2009-2019 was the fastest period of decline in the scale resilience index.At the county level,from 1991 to 2019,the scale resilience index of each county in Hohhot showed an obvious downward trend.Cities with similar scale resilience indices tend to be concentrated in spatial distribution,and the horizontal spatial pattern of scale resilience gradually decreases from the outside to the center.（2）The density toughness index increased first and then decreased under the development condition of low density toughness.Ecological deficit is the main factor that restricts the resilience of the region.In the past 30 years,Hohhot has been in a state of low density ductile development.Among them,the density toughness index from 1999 to 2009 was greater than 1,that is,ecological surplus appeared in the study area.According to the analysis of different land types,the type of high-density resilient land gradually decreases,and the toughness index of the density of fossil energy land and construction land changes greatly.At the county level,the density toughness index of Hohhot showed a decreasing trend from 1991 to 2019,except for Xincheng District,Hui District and Yuquan District.The density toughness index of counties varies greatly,and the proportion of counties that are higher than the average value is less.The density toughness level of central urban area is lower than that of peripheral counties.（3）The morphological toughness index decreased first and then increased under the development condition of low morphological toughness.The rationality of "source-sink" landscape configuration in county is weaker than that in central city.From 1991 to 2019,Hohhot was in a state of low form resilience.Since 1999,the morphological toughness index has continued to increase and gradually approached 1.At the county level,the morphological toughness of all counties in the study area showed an increasing trend in the last 30 years,and the variation range of morphological toughness index in most counties was small in time series.The difference of morphological toughness index among counties increased gradually,and the spatial pattern of morphological toughness was higher in central urban area and lower in peripheral counties.（4）Under the condition of high comprehensive toughness,the comprehensive toughness index presents an inverted V-shaped trend of first increasing and then decreasing.High scale toughness can compensate for low density and low morphology toughness.From 1991 to 2019,Hohhot was at a high level of comprehensive resilience.Among them,1991-1999 was the period when the composite toughness index increased the fastest,1999-2009 was a slow growth,2009-2019 composite toughness index decreased rapidly.At the county level,from 1991 to 2019,the comprehensive resilience index of the new urban area showed a slight increase,but the other counties showed a decreasing trend of different amplitude.The comprehensive toughness index within the county has obvious difference and tends to change.The cities with similar comprehensive toughness index are close to centralized distribution in space.The spatial differentiation rule of comprehensive toughness level is generally lower in the southern foothill of Daqingshan and Tumet plain,and higher in the southwest and north of The county.（5）From 1999 to 2019,the main factors influencing the spatial-temporal evolution of Hohhot’s urban resilience changed over time.From 1999 to 2009,the leading influencing factors gradually changed from population density,patch density and per capita retail sales of consumer goods to urbanization rate,the proportion of primary industry output value in GDP and per capita ecological land use factor.In 2019,the leading influencing factors were urbanization rate,the proportion of primary industry output value in GDP,and the per capita retail sales of consumer goods.The category of dominant influencing factors gradually changed from society-nature-economic factors to society-economic factors,and the degree of influence of natural factors on urban resilience in the study area gradually decreased.