The Correlation Between Urban Spatial Compactness And Residents’ Carbon Emissions Intensity

Urban overall spatial structure has a strong lock-in effect on urban carbon emissions,and its related research has been concerned by domestic and foreign experts,scholars and government officials.Most scholars explore the impact of urban spatial form on carbon emission intensity through indicators such as urban density and development intensity,while some scholars study the relationship between urban land use level characteristics and carbon emission from the perspective of geometry,such as colo coefficient,finger coefficient and so on.However,from the research results,there are still some controversies about the relationship between urban overall spatial compactness and carbon emission intensity,such as whether compact cities and high-intensity population aggregation are low-carbon.In addition,the existing research samples are more,focusing on China’s first-line or new first-line big cities,and paying less attention to the general big cities and medium-sized cities,which need more guidance because of their huge development potential.This paper takes large and medium-sized cities in China as samples,based on multi-source open data,explores the correlation between spatial factors reflecting urban compactness and carbon emission intensity of urban residents’ activities,reveals the mechanism of various spatial factors affecting carbon emission intensity,and puts forward spatial optimization suggestions and strategies to adapt to the low-carbon development of large and medium-sized cities in China.Based on the sample data of 30 large and medium-sized cities in China,this paper puts forward a research framework of the correlation between urban compactness and carbon emission intensity of urban residents’ activities by applying the measurement of urban spatial agglomeration and relevant theories of urban carbon emission.Firstly,based on the overall spatial characteristics of the city,the urban spatial compactness is divided into three types of first level indicators,including scale agglomeration index,form agglomeration index and function agglomeration index.On the basis of the first level classification,the second level indicators are further selected to characterize their respective characteristics: scale compactness includes population scale,built-up area,population density and residential floor area ratio;Morphological agglomeration includes compactness,mesh fractal dimension,radius fractal dimension and fragmentation;Functional agglomeration includes land use diversity coefficient(GM value)and functional autocorrelation.Secondly,by combing the relevant literature and combining with the availability of data,this paper constructs the measurement method of carbon emissions from urban residents’ activities,which includes three parts: domestic electricity,household gas and transportation.Thirdly,with the help of SPSS data analysis platform,the significant influencing factors of urban carbon emission intensity are analyzed and identified,and the mechanism and influence degree of the two are further revealed through regression analysis.Finally,based on the above analysis,this paper puts forward the space strategy suitable for the low-carbon development of large and medium-sized cities.Through the study,the author found that there are significant differences in the carbon emission level and the spatial agglomeration of the sample cities,and there are also some differences in the intensity of the impact of various spatial factors on carbon emissions.Among them,scale compactness,form agglomeration and function agglomeration have a strong impact on the carbon emission intensity of urban residents’ direct activities.Specifically,the agglomeration of population and construction,the central agglomeration of cities,the heterogeneous distribution of green open matrix and the diversity of urban land use all have a positive impact on urban low-carbon.Finally,based on the research conclusions,the paper puts forward the low-carbon development path of large and medium-sized cities,which is the construction mode of "compact morphology and structure,medium and high intensity development and construction,organic evacuation of green matrix and multi-scale function composite".