Spatial-Temporal Differentiation of Urban Green Space and its Influencing Factors:A Case Study of the Yangtze River Economic Belt,China
The rapid urbanization in the Yangtze River Economic Belt,China has been significantly reforming the structure and pattern of urban green spaces,exerting profound impacts on urban environment quality and human well-being,and aggravating resource and environment conflicts.Previous studies mostly concerned about morphology,composition and configuration of green space in a city or in city cluster,but there was little knowledge of the spatio-temporal patterns,influencing factors and driving mechanisms of urban green space along different reaches of a typical basin economic zone,where cities in the proximity of the river exhibited distinct differences in resource,natural environment and economy;therefore they lacked of practical guidance significance.In this study,it took the Yangtze River Economic Belt as a case study;spatial autocorrelation analysis and geodetector were used to analyze the spatial-temporal differentiation of urban green space in cities along the basin for the period of 2000-2020 and associated influential factors.(1)Total area of urban green space in the Yangtze River Economic Belt increased from 3357.66 km2 to 13 425.32 km2,with a growth rate of 22.56％to 39.04％for 2000-2020.The growth rate of urban green space was in an order of downstream area＞upstream area＞midstream area.(2)During 2000-2020,urban green space demonstrated a pattern of spatial agglomeration with obvious polarization.The areas of high-value agglomerations shifted to east,mainly distributed in the border areas of Jiangxi,Anhui,and Jiangsu provinces.The areas of low-value agglomerations tended to cluster in the mountainous mid-west areas,mainly in the intersection zones of Sichuan,Yunnan,Guizhou and Hubei provinces.(3)The spatial-temporal differentiation of urban green space in the Yangtze River Economic Belt was governed by joint effect of climate,topography,population,urban construction,economic development,regional policy and so on;the dominant factors in the upstream,midstream and downstream regions were different.The interaction of factors showed a significant dual-factor enhancement effect and non-liner enhancement effect on the spatial-temporal differentiation of urban green space.The interactions among all influencing factors produced positive effects of two-factor enhancement and nonlinear enhancement on spatio-temporal differentiation of urban green space in the Yangtze River Economic Zone.This study would provide valuable references for the design of urban green space and sustainable urban development in the Yangtze River Economic Belt.
urban green spacespatial-temporal differentiationinfluencing factorsgeodetectorthe Yangtze River Economic Belt
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