| In recent years,Chongqing’s population is increasing,increasing the demand for construction land and arable land,infrastructure construction occupies a large number of woodland,grassland and other ecological land.With the increasing exploitation of surface space and natural resources,the original ecosystem and ecological corridor are destroyed,and the discharge of domestic sewage and garbage is also increasing,resulting in the widening gap of regional development,extensive land use and other serious problems,and the increasingly prominent contradictions between human social development and ecological environment,production and living activities,and the internal relationship of natural ecosystem in Chongqing.Therefore,it is of great significance to study spatial and temporal evolution law and ecological environment quality of “Sansheng space” for Chongqing to promote ecological restoration,implement large-scale land greening promotion actions on both sides of the Yangtze River,adjust the contradiction between human social development and ecological environment,realize the sustainable development of social economy and ecology,and provide decision support for Chongqing’s land space planning.Firstly,based on the land use data of Chongqing in 2005,2010,2015 and 2020,taking the3 km2 honeycomb hexagon as the smallest statistical unit of this study,this thesis reconstructed the “Sansheng space” of Chongqing into seven types by using the theory of “Sansheng space”reconstruction,and then analyzed its spatiotemporal evolution law based on the method of transfer matrix and standard deviation ellipse.Secondly,it combined the theory of “Sansheng space” with the dominant function of land use based on the eco-environmental quality index.this thesis analyzed the eco-environmental quality of Chongqing,and analyzed the spatial distribution characteristics of each district and county according to the global Moran index and local Moran index,and revealed the transformation of the leading function of the “Sansheng space” and its impact on the ecological environment in the process of regional development by using the characteristics of spatial transformation and the response law of the ecological environment.Then,27 driving factors were selected from two aspects of natural factors and human factors to build the driving force index system of ecological environment quality of“Sansheng space” in Chongqing in 2015.After discretizing the continuous indexes and determining the optimal discretization method and classification number,the driving force of each index was calculated by using the factor detector model of geographic detection,and then the interaction between indexes was analyzed by using the interactive detector model,and feasible suggestions were provided according to the driving force analysis results.The following conclusions were obtained:(1)Ecological-Production advantage type was distributed in southwest northeast direction,and distributed in the south,middle,northeast and southeast of Chongqing.Ecological dominant type was mainly distributed in the south,Southeast and northeast of Chongqing.Production dominant type was distributed in the northwest and central areas of Chongqing.Life-Production advantage type,Ecological-Life advantage type and Sansheng equilibrium type were more distributed in the central area of the main urban area,and scattered in other areas.According to the order of area,Ecological-Production advantage type > Ecological dominant type > Production dominant type > Life-Production advantage type > Life dominant type > Ecological-Life advantage type > Sansheng equilibrium type.During the period of2005-2020,the change of Ecological-Production advantage type was the biggest,which first transformed to its derivative type,and then transformed from its derivative type to other types.The center of gravity was concentrated in the vicinity of the main urban area of Chongqing and the east of Chongqing.In terms of overall distribution,the Production dominant type was mainly distributed in the northwest of Chongqing,reaching Yongchuan District in the west and Liangping District in the east.Ecological dominant type was mainly distributed in the eastern part of Chongqing,with a Southwest northeast trend,while the Ecological-Production advantage type was located between the former two,also with a Southwest northeast trend.The other four types were derived from living space,and the area is small.It was distributed in the areas with large population in each district and ounty,taking the nine districts of the main city as the core with a Southwest northeast trend.(2)From 2005 to 2020,the eco-environmental quality index of Chongqing City fluctuated and rose,which were 0.3988,0.4021,0.4009 and 0.4414,respectively,and its global Moran index was 0.5231,0.5718,0.6089 and 0.6965,respectively,which had significant aggregation characteristics and spatial positive correlation.The eco-environmental quality was divided into five gradients from southwest to northeast.Among them,Western Chongqing was the first gradient and cold spot area,Southeast Chongqing and Northeast Chongqing were the fourth and fifth gradient and hot spot area.From 2005 to 2010,the comprehensive ecological contribution was + 0.6096,the main contribution transformation mode was from general ecological land to key ecological land,and the absolute ecological contribution was 69.64%.During 2010-2015,the comprehensive ecological contribution was-0.3078,and the transformation mode with the highest inhibition effect was from agricultural production land to urban production land,with an absolute ecological contribution of 46.45%.In 2015-2020,the comprehensive ecological contribution was +0.0187,and the absolute contribution of general ecological land and agricultural production land to key ecological land was the highest,with41.05% and 24.04% respectively.(3)The Q value of 26 driving force indexes gradually increased with the increase of classification number,which was divided into compact type,fluctuating type and differential type,with 9,6 and 11 indexes respectively.The best discrete method was the geometric interval method and the natural breakpoint method,which had 8 indexes at most,followed by the quantile method,which had 7 indexes,and the least was the equal interval method,which had only 3 indexes.The main driving factors of the highest contribution were “The Reconstruction and Combination of ‘Sansheng space’”,“DEM”,“Air Temperature”,“Slope”and “Population,” which reached 0.68,0.49,0.46,0.39 and 0.37 respectively.Most of the economic indicators were the main influencing factors,and the contribution value of “GDP”was the largest among all economic indicators,which was 0.33.The industrial three wastes factor was the secondary factor,the contribution was 0.20-0.26.And the interaction between“The Reconstruction and Combination of ‘Sansheng space’” and most factors was greater than0.70,and the interaction between “DEM” and “Animal Husbandry GDP” was the strongest in the interaction between “DEM” and other factors,reaching 0.59,so was “Air temperature” and“Animal Husbandry GDP”.The interaction between “The Distance to The Airport” and most other factors was stronger than that between other factors and the remaining factors,and“Precipitation” also had the same feature. |
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