Analysis Of Land Cover Change And Its Driving Forces In Chengdu Plain Area

In recent years,with the deepening of globalization,global change has become one of the hot research in experts and scholars of various countries,land use change and driving force analysis have also become one of the key points of global change.Through the study of the change in land use,analysis of the affect factors with land use,it is possible to detect the transfer of all kinds of land use,it can deep understanding of the mechanism of land change.The Chengdu plain area is the political and economic center of the southwest China,it has the role of radiation and driving in the economy of Southwest China.But at present,there are few studies on the change of land use in the Chengdu plain.Through the discussion of the land use and driving force in the region,to promote the adjustment of industrial structure in Chengdu plain area,the rational allocation and layout of land use is of certain reference significance.This paper is completed with the help of the“Key Laboratory of the Ministry of Education”and“National Natural Science Foundation Project”.Extraction of land use change data from 2000a,2007a,2008a and 2015a in Chengdu Plain Based on remote sensing and GIS technology and field verification.Based on single land use dynamic degree,land use comprehensive degree and land use transfer model,the temporal and spatial variation characteristics and spatial transfer of land use in Chengdu plain(a total of 32 counties)were studied.Application of FRAGSTATS software selection,landscape area,density,diversity,and agglomeration the 4 and 11 factor analysis of landscape pattern of land use and landscape pattern change.To explore the driving force of land use change in Chengdu plain area by use of geographic detector.The following conclusions are drawn:(1)In the past 15 years,the spatial and temporal change of land use in Chengdu plain is remarkable,and the regional difference is obvious.The main manifestations are as follows:From the change of the area of all kinds of ground objects in the Chengdu plain,The area of construction land from 9.924×10~4hm~2 in 2000 to 3.2125×10~4hm~2 in2015,increased 223.71%in 2015.In the 2008-2015 period,the area of construction land was increased to 11.72×10~4hm~2,the proportion of cultivated land has declined continuously,from 58.88%in 2000 to 44.27%in 2015,the total decreased by 14.61percentage points;forest land ratio first increase and decrease,during the 15 years of water and grassland,the change of area and the ratio of area to area are basically unchanged,the area in which the unused land was added to 2.437×10~4hm~2 in 2008.Among the districts and counties,the larger changes include Jiangyou,Mianyang and Leshan,Among them,the largest change in woodland and cultivated land is Leshan,The biggest change in construction land is Pixian.(2)There is a big difference in the density of landscape types,with the deepening of human activities,landscape contagion decreased.Analysis of landscape pattern in Chengdu plain,the first 4 land use types of the area are cultivated land,forest land,construction land and water,the patch density index of construction land is increasing,the patch density of cultivated land decreases,the change of patch area and density of each land use type tends to be balanced,different types of landmark have been developed in a more coordinated way.(3)The analysis of Geo Detector shows that the main driving force influencing the land use change in Chengdu plain is social and economic factors.Factor detection analysis shows that the main factors are GDP factor and population factor.With the continuous development of domestic economic construction,the impact of social and economic factors on land use changes is increasing.National policies are particularly important for the promotion of land use,the impact of population on the land use degree is deepened.Therefore,government departments need focus on population and economic factors in the development planning policies.