A Study On The Relationship Between Intensive Land Use And Carbon Emissions

Global warming caused by carbon dioxide emissions has become one of the most serious problems facing mankind.How to optimize the land use structure under low carbon has become a hot issue in recent years.This paper takes Beijing,Tianjin and Hebei Province as the research object,uses the analytic hierarchy process to determine the index weight,evaluates the land intensive use of Beijing,Tianjin and Hebei Province from the perspective of urban agglomerations and prefecture level cities,and then discusses the temporal and spatial changes of carbon dioxide in the research area.Finally,the response between EKC curve fitting and decoupling analysis is studied.Combined with this study,it can provide reference for each region to realize the optimization of land use structure under low carbon emissions,and also provide theoretical support for the global energy conservation and emission reduction.The specific conclusions are as follows:(1)From 2005 to 2017,the overall intensive use level of Beijing Tianjin Hebei Urban Agglomeration showed a trend of increasing year by year,except for a slight decrease in 2006 and 2015;there was a significant difference in the level of land intensive use between prefecture level cities.The difference of land intensive use level between Beijing,Tianjin and Hebei is obvious.The cities with high intensive use level are mainly distributed in the middle,South and East,while the cities in the north,West and northwest have relatively low intensive use level.According to the classification of land intensive use level,the intensive use level of each city is relatively low in 2005,Zhangjiakou and Chengde are two northern cities,the level is extensive use,and other cities are generally intensive use,while in 2017,most cities’ land intensive use level transited from extensive use to intensive use.(2)From 2005 to 2017,the carbon emissions of urban agglomerations showed a trend of increasing first and then decreasing,and the carbon emissions between cities showed significant temporal and spatial differences.Tangshan,Handan and other Eastern and southeast regions are mainly heavy industries,with relatively high urban carbon emissions,while Qinhuangdao,Zhangjiakou Chengde and other northern and northwest cities have relatively low carbon emissions.Langfang and other cities in Beijing have a better economic development,with the tertiary industry as the main industry,and the overall carbon emissions and carbon intensity are relatively low.(3)The highly intensive urban economy is highly developed,with the lowest carbon emission intensity.The extensive utilization of urban economy is relatively slow,with the highest carbon emission intensity.The intensive utilization of land and the average carbon emission of land show an obvious inverted "U" EKC curve,and the land use intensive index reaches the peak at about 0.47.There is a typical inverted "N" EKC curve between land intensive use and carbon emission intensity.When the intensive use index is about 0.43 and 0.74 respectively,the carbon emission intensity reaches the lowest and highest peak.(4)From 2005 to 2017,the total amount of land intensive use and carbon emissions in most cities showed a strong decoupling state,and carbon emissions were less and less affected by land intensive use;Beijing’s land intensive use and per capita carbon emissions were strong decoupling state in each period,and Langfang’s and other cities’ land intensive use and per capita carbon emissions gradually became strong decoupling state;nearly 80% of urban carbon emissions The release intensity is completely decoupled from the intensive use of land.