Regional Difference And Influencing Factors Of Green Rate Of Built District Of Urban Agglomerations In China From 1996 To 2016

With the advancement of urbanization,China has entered a regional development pattern with urban agglomeration as the main body.The construction of urban green space has become an important part of urban development.However,under the influence of economic development level,natural geographical environment,population,land scale and other factors,the regional imbalance of urban green space construction is increasingly significant.As the leading development mode of new-type urbanization,urban agglomeration will become a good space carrier for urban green space construction and development,and will directly affect the development direction of urban green space construction in China.Its goal of establishing a good division of labor system and hierarchical relationship also makes it a development trend to cultivate and construct the urban agglomeration through hierarchical division.At the same time,it also provides the possibility to analyze the regional differences of urban agglomeration green space construction from multiple perspectives.However,urban agglomerations at different levels have obvious differences in green space construction foundation,financial support and local power.The accurate analysis of the differences between urban agglomerations at different levels and their internal green space construction level,and the exploration of the influencing factors are conducive to the exploration of the root causes of green space construction in urban agglomerations,providing theoretical basis for the formulation of differentiated green space construction regulatory policies,so as to ensure the scientific and sustainable development of urban green space construction.This article is based on party and Lin,etc.According to the basic quantitative standard of urban agglomeration recognition,development degree and strategic position,etc.,in China urban agglomeration development report 2016 put forward China's urban agglomerations construction pattern of "5+9+6" hierarchy,a total of 20 urban agglomeration as the research unit,namely five national priority to the construction of urban agglomeration,making it a country opening to the outside of the main portal,the core of the national economic development,steadily building nine regional urban agglomeration,improve the urban system,strengthen the resource environmental bearing capacity,guide the cultivating six regional urban agglomeration,Make it the core of regional economic development and the important support of promoting China's regional balanced development.Taking the green rate of built district as the research index andintegrating the difference index,spatial analysis and other methods,this paper studied the difference characteristics and composition decomposition of the green rate of built district in China's three major urban agglomerations from 1996 to 2016.Combined with the geographical detector method,the factors affecting the spatial and temporal pattern of greenness rate in urban agglomerations and the green rate of built district of urban agglomerations at different levels are quantitatively analyzed through factor detection and interactive detection,so as to reveal the driving force behind it and the interaction between multiple factors.Empirical results show that:(1)In terms of temporal and spatial distribution: On the whole,the green space construction level of urban agglomerations in China presents a steady rising trend,with obvious location advantages compared with that of the whole country.However,urban agglomerations at all levels show obvious growth differences.The low-speed development agglomeration trend is intensified,and the development level of green space construction lags behind the development level of urban agglomerations.(2)In terms of difference evolution and decomposition: the regional difference of green land construction of urban agglomeration is decreasing in general and in hierarchical levels,but the degree of narrowed difference at different levels is different,showing the characteristics of "local level> national level > regional level".The difference in the level of the overall difference between the level of the urban agglomeration is slightly increased,but it is mainly caused by the internal difference of the hierarchy.National urban agglomeration has the largest internal difference,and the influence of the overall difference is gradually being strengthened.(3)Influence factor detection:(1)Factor detection: economic development and expansion of construction land are the main driving force to improve the greening rate of built-up areas.Factors such as the cohesion of population and fixed asset investment in landscaping have significant influence,and the "natural influence" of natural environmental factors is gradually emerging.(2)Interaction detection: the interaction between natural environment and socio-economic factors shows consistent positive reinforcement,among which the interaction between socio-economic factors has long been dominant,and the interaction between topography,landform,hydrothermal conditions and socio-economic factors has significantly improved.Starting from the perspective of urban agglomeration,this paper deeply analyzes the spatial-temporal evolution and heterogeneity of green rate of built district agglomerationsin China,breaks the solidified classification model of "east,west" regions and administrative divisions,and enrichees the perspectives and methods of research on the difference of urban green space construction level.On the basis of quantitative analysis of influencing factors,this paper puts forward countermeasures and Suggestions for urban green space construction in urban agglomeration in accordance with local conditions qualitatively,so as to provide scientific basis for different urban agglomeration to formulate relevant green space construction and development policies.