Study On The Spatial And Temporal Evolution Characteristics Of Land Use In Anshun City And Its Driving Factors

In recent years,Anshun City has entered a new historical plateau in terms of economic level under the impetus of western development and new urbanisation.The economic development will inevitably lead to an increase in human demand for land resources,and some areas have been exploiting land on a large scale in order to meet the needs of economic development,causing serious damage to land resources and ecological environment.Therefore,an in～depth analysis of the spatial and temporal evolution characteristics of land use in Anshun and an investigation of the driving factors of its changes will not only help guide the rational layout of land resources and coordinate the relationship between land,nature and the economy,but also lay a good theoretical foundation for the sustainable use of land.This study takes Anshun,the city with the most concentr ated distribution of karst landscapes,as the research object.Firstly,on the basis of the current land use data from 2000 to 2020,the spatial and temporal evolution characteristics of land use in Anshun are analysed from the levels of scale change,degr ee change,structural change and transfer change by using the dynamic attitude index,transfer matrix and kernel density estimation.Secondly,18 driving factors are selected from five dimensions,including natural environment,social economy,transportati on location,industrial structure and policy orientation,and a logistic regression model is used to explore the driving factors of land use change.Finally,the salient problems in the spatial and temporal evolution of land use are sorted out and summaris ed,and specific countermeasures are proposed in the light of the main drivers of land use change.The results of the study show that.(1)land use types in Anshun are mainly forest land,supplemented by grassland and cropland;the land use structure is relatively balanced,but the degree of order in the land use system is low.Grassland,construction land and water areas show a year～on～year increase,while cropland shows a decrease and then an increase,while forest land shows an increase and then a decrea se,and unused land does not change significantly,while construction land and water areas show the most significant increase and forest land the most significant decrease.The overall rate of land use is characterised by "slowing down first and then speed ing up".The extent of land use in Anshun is relatively stable,gradually shifting from a period of decline to one of rapid development.The most significant changes in land use are in the areas of arable land and forest land,followed by grassland,constr uction land and water.The density of land use transition is characterised by a change from "scattered to relatively concentrated",and the overall pattern of change is characterised by a change from "concentrated-relatively concentrated-scattered-concentrated".All types of land are concentrated in the elevation range of 1124～1505m,while construction land,arable land and water areas are concentrated in the slope range of 6°～15°,grassland in the slope range of 6°～25°,and forest land in the slope range o f more than 25°.(2)Changes in arable land are mainly influenced by a combination of transport location and natural environmental factors.In contrast,the main drivers of forest land change differ markedly in different periods,with 2000～2010 mainly infl uenced by a combination of transport location and natural factors,while 2010～2020 adds the influence of socio-economic and policy-oriented factors to that of the previous period.For the change in construction land,industrial structure,socio～economic an d policy orientation determine the extent of change in construction land,while the natural environment and transportation location determine its distribution pattern and evolution direction.