Evaluation Of Carbon Cycle Of Changsha Urban System And Decarbonization Of Land Use

City is the area which be effected mostly by human activities. Since the Industrial Revolution, the change of land use in city is considerable.What’s more,the fossil fuels is mainly conbusted in this area.More than 80% of the carbon dioxide emission is in city.The process of urbanization has profound influence on global climate and carbon recycle.Quantitatively modeling the urban carbon cycle processes not only help to establishing urban carbon emission inventory standard, but also help to understanding the role of urban carbon cycle in the process of regional carbon cycle process.Quantitatively modeling the urban carbon cycle processes not only help to establishing urban carbon emission inventory standard, but also help to understanding the role of urban carbon cycle in the process of regional carbon cycle processBased on the summarization of research situation of urban carbon cycle, this paper establish the theoretical framework of carbon cycle of urban system Then put forward the estimation methods for carbon budget and carbon circulation of urban system, Then, take Changsha city as the case, this paper studied the carbon cycle processes of, urban system analyzed the carbon emission, carbon flux of different land use types, and also analyzed the carbon emission effect of land use change. Finally several low-carbon urban management strategies based on land use structure optimization of Changsha was put forward.The main conclusions are as follows:(1)The carbon storage of Changsha in 2013 is 7194 104tC,the carbon input is 3930 104tC,the carbon export is 3971 104tC.(2)Optimization scheme of land use structure based upon minimum carbon emission is the best scheme of the three schemes.