The Research On Temporal And Spatial Change Of Carbon Emission Of Land Use Change In Jiangsu Province

With the global warming,the energy consumption largely based on fossil fuel has become the largest source of greenhouse gas emissions.The change of land-use caused by land-use behavior has become another source of greenhouse gas emissions,which accounts for a third of total man-made carbon emissions.So it indicate that the change of land-use can not only have an important impact to the environment through changing carbon emissions but also become an important factor to influence climate change which can not be ignored.How to control carbon emission of land-use and to realize the harmonious development of economy and environment has become an important research topic.Based on the analysis of three groups of remote sensing image data of Jiangsu Province,the quantities changes of land-use and land-use structure are first analyzed to explain the change and feature of different land-use types in 2005,2010 and 2015.Then,the carbon emissions of land-use in Jiangsu Province are calculated and the carbon emission effect of land-use are analyzed by three indexes,namely,per land carbon emission intensity,per capita carbon emission intensity and carbon emission intensity in Jiangsu Province to reveal the temporal characteristics and regional differentiation characteristics.On this basis,the theory of spatial autocorrelation analysis is used to analyze the spatial correlation characteristics of land-use carbon emissions,per land carbon emissions intensity,per capita carbon emission intensity,carbon emission intensity in all districts and counties of Jiangsu to reveal the relationship between them.Then,the theory of Kriging interpolation is used to analyze spatial and temporal evolution characteristics of carbon emissions of land-use,per land carbon emissions intensity and per capita carbon emission intensity.The main conclusions are as follows:(1)The main type of land-use in Jiangsu Province is farmland and others are relatively rare from 2005 to 2015.The area of farmland,forest land,grassland and other land-use decreases with different degree.Among them,the change of other land-use changes a lot with the largest degree and the change of farmland with the smallest degree.The information entropy of land-use structure in Jiangsu Province increases year by year.It indicates that the order of land-use structure in Jiangsu Province is gradually reduced while the degree of disorder is gradually strengthened.The degree of equilibrium increases slightly while the degree of dominance decreases correspondingly.(2)Carbon emissions of land-use in Jiangsu province showed a continuous growth trend from 2005 to 2015.The farmland and construction land are both carbon sources and the construction land is the main carbon source.Forest land,grassland,garden land and other land-use are carbon sinks,among of them,the forest land and waters are the main carbon sinks.The variation of carbon source is larger than the change of carbon sink.The carbon emission intensity shows a downward trend while per land carbon emission intensity shows a rising trend and per capita carbon emissions intensity shows a slow upward trend.It shows that mode of environmental friendliness of land-use is declining and environmental pressure is increasing.(3)The four carbon emissions indexes in Jiangsu Province,the carbon emissions of land-use,the per land carbon emission intensity,the per capita carbon emission intensity,the carbon emission intensity,showed a rising trend and they also showed a significant regional differences from 2005 to 2015.The southern of Jiangsu of the four indexes are obviously higher than those of the central and northern part which are relatively small.The changes of these four indexes are analyzed.The result indicates that the number of low emission areas of land-use carbon emissions declines with a small degree while the number of medium-low emission areas increases with a small degree.Medium emission areas remain unchanged and medium-high emission areas increases significantly while the high emission areas number remain unchanged.The number of low intensity areas of the per land carbon emission intensity and per capita carbon emission intensity decreases.The number of medium-low,medium and medium-high strength areas remains unchanged while the number of high intensity areas increases.The carbon emission intensity in the low intensity area increases a lot and the number of middle-low intensity area and medium intensity area has a little change while the middle-high and high intensity areas and high intensity areas decrease significantly.The data indicates that with the development of economy and the acceleration of urban construction,the rising trend of carbon emission index is obvious and the gap between different areas is gradually increasing.(4)Carbon emissions of land-use,per land carbon emissions intensity,per capita carbon emission intensity in all districts and counties of Jiangsu have significant spatial correlation and also have certain spatial characteristics from 2005 to 2015.Through Kriging interpolation to make a spatial-temporal variation analysis,the data shows that low value areas are widely distributed in the central and the eastern coastal areas;medium-low value areas are distributed in the southwest and northwest;high value and medium-high value areas are mainly distributed in the southeast.Median areas are mainly distributed in the central area.