Analysis On The Spatial-temporal Distribution Pattern And Influencing Factors Of Green Space Rate In The Built-up Area Along The 106 National Highway

With the advancement of new urbanization in China,people pay more attention to the ecological livability,so the construction of urban green space is getting more and more attention.In order to measure the matching of urban green space scale and urban construction land scale,the green space rate of built-up area has become one of the important indicators to directly measure the level of urban green space construction.Due to the gap between the resource endowment and the level of social and economic development in different regions of China,there is an obvious regional imbalance between the green space rate and its growth rate in the built-up area.To reveal the spatial-temporal differences of urban green space construction level and its influencing factors is conducive to promoting the construction of a better urban living environment for the people.Based on the research framework of "transect geographical exploration",this paper takes 96 county-level cities and above along the 106 National Highway as sample units,takes the spatial-temporal pattern characteristics,evolution rules and influencing factors of green space rate of urban built-up areas as research contents,and relies on Arc GIS and other software,and adopts the method of combination of mathematical analysis and spatial analysis to explore the green space of urban built-up areas in 1996-2017 The gradient difference characteristics and evolution process of rate in different spatial patterns,and further analysis of "social nature" mechanism.Research shows:(1)From the perspective of time sequence evolution,the green space rate of the built-up area in the sample area is increasing,but the growth rate is rising first and then declining.Compared with the whole country,the green space rate of the built-up area of the transect is more significant;the overall scale of the transect shows a decreasing pattern of "north south central".The absolute and relative differences of 106 transects are shrinking,but the differences will exist for a long time,and the differences are mainly caused by the uneven development of each region of the transects.(2)From the perspective of spatial differentiation,the overall difference of green space rate in the built-up areas of 106 sample belts is obvious,showing a spatial pattern of "high in the north and south,low in the middle";the difference between the cities gradually decreases,and the average annual growth rate shows a law of "fast in the middle,slow in the north and South".The distribution characteristics are highly consistent with China’s economic development and distribution of natural geographical conditions,indicating that there is a strong spatial correlation between the development of green space rate of urban built-up areas and urban socio-economic and natural geographical conditions.(3)The complex dynamic interaction,such as economic strength and natural force,is the main cause of the difference,among which GDP per capita,garden city and built-up area per capita are the main driving factors,and the interaction force of two factors is generally higher than that of single factor.(4)The level of economic development is the decisive factor that causes the regional difference of green space rate in the built-up area,and further strengthens the spatial differentiation in the later stage;the natural conditions have two-way influence,and the basic spatial distribution pattern of green space rate in the built-up area in the initial stage of framed sample belt supports the early stage development and restricts the later stage construction.National policy is an important influencing factor,and infrastructure and industrial structure also play an important role.At the same time,the national policy is an effective starting point for the development of urban green space in the north of the sample belt,the economic development is the main driving force for the construction of urban green space in the middle of the sample belt,and the restriction of geomorphic type is an important obstacle for the promotion of urban green space in the south of the sample belt.The influencing factors that cause the regional difference and evolution of the green space construction level of the sample Belt city are constantly changing,and the role and degree of each influencing factor and combination in different regions and development stages are also different and changing.The research quantitatively and accurately shows the gradient and stage influence of "natural social" factors on the regional differences of urban green space construction in106 sample zones,and explores the comprehensive role of multiple factors in different regions and different development stages.In order to provide a theoretical basis for the scientific formulation of urban green space construction policies in typical regions,and further coordinate the impact of natural and social economic policies on urban green space.