Study On The Characteristics And Influencing Factors Of Land-use Carbon Emissions In The Yangtze River Delta Urban Agglomeration

Climate change seriously affects natural ecosystems and carbon dioxide?CO₂?plays an important role in climate change.Terrestrial ecosystem carbon emissions are mainly from fossil-fuel burning and land-use change.This thesis investigated 26 cities in the Yangtze River Delta urban agglomeration?YRDUA?.Firstly,to obtain land use information,we classified the Landsat images acquired in 1995,2005,and 2015 using the random forest classifier.Then,combined with energy consumption and socio-economic data,the carbon emissions,carbon intensity and per capita carbon emissions of cities were calculated.Meanwhile,their spatial and temporal characteristics and spatial correlations are analyzed.Finally,based on the analysis of the factors influencing carbon emissions,suggestions of low-carbon development for the YRDUA were proposed.This study can provide a theoretical basis and decision support for the government to effectively control carbon emissions and carbon emission intensity,rationally allocate carbon emission reduction tasks in different cities,and formulate specific carbon emission reduction policies.The main results and conclusions are as follows:?1?The characteristics of land-use change in the YRDUA were analyzed.Cultivated land was the largest in the YRDUA,followed by forest and water.The largest change in land area was cultivated land,followed by built-up land—where a large amount of cultivated land was converted into built-up land—while other land types were less changed.?2?The spatial and temporal characteristics and causes of carbon emissions in the YRDUA were discussed.From the perspective of YRDUA,land-use carbon emissions have the characteristics of river-level cascades,Shanghai and cities along the Yangtze River had higher carbon emissions.From 1995 to 2015,the carbon emissions of 26cities gradually increased and the spatial differences gradually increased.The carbon emission intensity gradually decreased,and the spatial differences gradually narrowed.?3?The carbon emission types of cities in the YRDUA were divided,and the“cold spots”and“hot spots”cities were identified.Shanghai was the high carbon emissions and low carbon emission intensity type.Cities in Zhejiang province were mainly the low carbon emissions and low carbon emission intensity type while cities in Anhui province were mainly the low carbon emissions and high carbon emission intensity type.Shanghai and Suzhou were significant“hot”cities for carbon emissions.The“cold spot”city had changed greatly.They were concentrated in Anhui province in 1995 and 2005;however,it was Hangzhou in 2015.The significant“hot spot”city with carbon intensity was Wuhu,and the“cold spot”cities were concentrated in Zhejiang province.The“cold spot”city for per capita carbon emissions was Hangzhou but there was no significant“hot spot”city.?4?The influencing factors of land-use carbon emissions in the YRDUA were revealed,and the suggestions for low carbon development were proposed.The main factors affecting land-use carbon emissions in the YRDUA were population size,per capita GDP,energy intensity,and land-use structure.The effect on carbon emissions of four factors was positive,and the most influencing factor is population size.Therefore,we proposed specific low-carbon development proposals from four aspects in this thesis:guiding the rational distribution of population,promoting coordinated economic development,improving energy efficiency,and strengthening the concept of low-carbon environmental protection.