Allometric growth relationship and coordination between urban area and green space area in the Yangtze River Delta region
The relationship between urban area and green space area development is a key issue affecting the quality improvement of new urbanization in cities.Taking the Yangtze River Delta(YRD)region as the study area,we use the allometric growth model and the coupling coordination model to explore the development relationship between urban area and green space area from 2000 to 2020,and extract the interaction law and influencing factors of urban area-green space area allometric growth and coupling coordination.The results show that:1)The urban area and green space area of the YRD exhibit the spatial structure of'one pole and many cores',and it is highly stable in structure.Temporally,the allometric relationship type evolves with weak green space expansion-basic coordination between urban area and green space-weak green space expansion,while spatially,the number of cities with weak green space expansion type,i.e.,positive allometric growth type,dominates.2)The overall trend of coordination between urban area and green space in the YRD is increasing,and the pattern of coordination has strong stability,with a spatial distri-bution pattern of'high in the east and low in the west',and the spatial difference of coordination is expanding.3)The quantitative structure of coordination types between urban area and green space area in the YRD has changed from'pyramidal',which gradually decreases with increasing coordination,to'olive',which has the largest number of cit-ies with medium levels of coordination.The coordination degree of positive allometric growth cities tends to rise with large spatial differences,while the coordination degree of negative allometric growth cities tends to fall with large spatial differences.4)The urbanization rate,GDP per capita and population density affect the coupling coordination degree strongly,while the proportion of tertiary industry,fixed asset investment rate and financial self-sufficiency rate have different degrees of influence on the coupling coordination degree and the allometric growth rate.All of the influence factor on the coupling coordination degree exceeds that of the allo-metric growth rate.
urban areagreen space areaallometric growthcoordinationthe Yangtze River Delta region
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