| Global "greenhouse effect" is a hot topic in the current era,and also an important ecological and environmental problem that needs to be solved urgently.From the concept of "low-carbon economy" put forward by the UK in 2003 to the implementation of the concept of "low-carbon city",the research on "carbon emission" of cities has made rich achievements.As the carrier of urban operation and development,urban space is closely related to carbon emissions.However,there is still a lack of research on urban carbon emissions at the micro scale,and it is difficult to systematically explore the impact of urban space environment on carbon emissions.This article is based on low carbon city related research results,using the SNPP-the VIIRS night light data for urban space simulation of carbon emissions,and with Hefei city as an example,to build the urban carbon emissions evaluation model based on the night light data,and to explore the microscopic scales space-time distribution of urban carbon emissions,again through the city space environment quantitative,analysis of the urban space environment and space relationship of carbon emissions,and by means of the improvement of the urban space environment construction and control,to reduce the carbon emissions of the city,improving the living environment.The main findings are:(1)The results show that from 2013 to 2018,the carbon emission of Hefei maintained a growth rate of about 2%,and with the change of seasons every year,the carbon emission of main urban areas of Hefei presented a seasonal change of less summer and more winter.Among the monthly changes,April,August and November are the high carbon emission period,while the carbon emission in other months is quite variable.Spatially,the carbon emission in the main urban area of Jefei shows a high spatial autocorrelation(?0.882),but the correlation decreases gradually with the passage of time.The carbon emission of main urban area of Hefei was the highest in Yaohai district,Jingkai district and administrative district,and the lowest in Xinzhan district and Luyang district.However,the areas with high carbon emission values appeared in Shushan district,Binhu district and Baohe district.With the passing of time,the overall trend of Hefei's carbon emission has gradually changed from "single peak" to "double peak",and Binhu new area has gradually become another high-carbon emission area outside the city's second ring road.This study provides a micro-scale research method for exploring the spatial distribution of urban carbon emissions,in order to provide a reference for urban low-carbon development.(2)Build the index system of Hefei city space environment,from the perspective of land use and land capacity selection of indicators related to urban carbon emissions,to explore the city space environment's influence on carbon emissions in Hefei,selection of control index of land property respectively,building density,plot ratio,mixing degree,the density of road network,POI distribution density,population density,the rate and bicycle distribution density,public transportation sites distribution density,and the city's carbon emissions of grey correlation coefficient analysis,the result shows that selected indicators and city carbon emissions have high correlation,among them with building density has the highest correlation coefficient(0.8282),The correlation between floor area ratio and urban carbon emission was the lowest(0.6271).In addition,the correlation analysis results are used to analyze the index warning of urban carbon emission,and the "threshold value" of each control index is proposed when the state of urban high carbon emission is reached,and relevant control measures are proposed.(3)Urban spatial environmental indicators have a direct or indirect impact on carbon emissions.In addition to their own impact,the mutual impact of indicators will also have an impact on urban spatial structure,environment and traffic.Based on the comprehensive analysis of the influence mechanism of spatial environmental control indicators on urban carbon emissions,the paper puts forward the space control measures to reduce urban carbon emissions: strengthening land intensification in Hefei,improving urban land use efficiency and reducing energy consumption;Reasonable control of space compactness in the main urban area of Hefei,multi-center urban development mode;Five primary ventilation corridors and four secondary ventilation corridors were constructed to strengthen the urban ventilation environment.Promote urban green travel.At the same time,green travel in cities is promoted,and zoning control measures are proposed for various green travel modes.Figure [30] table[13] reference[115]... |
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