Research On The Scale Effect Of Driving Forces Of Land Use Change In Regions

In the field of land change,the role of land change and its driving factors has a significant scale correlation.The driving force of land use change revealed at one scale may not have any effect at other scales,and it is a multi-scale driving force of land use change space.The study of the function laws and mechanisms of the research helps to understand the process and mechanism of land use pattern change,so as to more accurately grasp the laws of regional land use change in order to achieve the rational and sustainable use of land resources.This paper selects a three-level research area consisting of the central Yunnan urban agglomeration,Kunming city,and Songming county.Based on the 1: 10,000 vector land use data in 2009 and 2015,the land use dynamics and land use transfer matrix are first used.The characteristics of the land change on the third level are analyzed,and then the geographic detector is used to detect the influence,relative importance and interaction of the driving factors for the expansion of construction land on the third level.Finally,based on this,a comparative analysis method is used to compare and analyze the effects of driving factors at different scales,and then the scale effect of driving forces affecting land use change is obtained.The main conclusions are as follows:(1)Cultivated land and forest land are the main types of land use in the central Yunnan urban agglomeration,Kunming City,and Songming County.From 2009 to 2015,construction land at all levels expanded significantly,mainly from cultivated land,forest land,and other land,and the change range And the rate of change are greater than other land types,while the area of cultivated land,garden land,forest land,grassland,waters and other land areas are decreasing.(2)The main accessibility factors and topographic factors affect the changes of cultivated land in the central Yunnan urban agglomeration.The changes in garden areas are mainly affected by socioeconomic and topographic factors.The changes in forest land are mainly affected by topographic factors and accessibility factors.Affected by socio-economic factors,other land changes are mainly affected by terrain and accessibility factors.The change of cultivated land in Kunming City is mainly affected by elevation,GDP,population and distance from residential areas.The change of garden land is mainly affected by social and economic factors.The change of forest land is mainly affected by elevation,terrain relief,slope and distance from towns.Land use expansion is greatly affected by GDP,elevation and population,and distance from roads,and other land changes are mainly affected by elevation,GDP,population,and distance from towns.Cultivated land and garden changes in Songming County are mainly affected by GDP,elevation,distance from towns and villages,and forest land changes are mainly affected by elevation,distance from towns,GDP,and population.The expansion of construction land is mainly affected by distance from towns Distance,elevation,GDP,and distance from residential areas are affected.Other land changes are mainly affected by distance from towns,elevation,distance from residential areas,and distance from roads.Interaction of driving factors The impact of land use change has been enhanced to varying degrees.The interaction between the distance and elevation of the central Yunnan urban agglomeration from the township has the greatest impact on the cultivated land change,and the interaction between the distance from the township and GDP has the greatest impact on the garden and other land changes The interaction between elevation and population has the greatest impact on forest land changes,and the interaction between GDP and distance from roads has the greatest impact on the expansion of construction land.The interaction between the driving factors of cultivated land change in Kunming is the interaction between elevation and population.The garden area change is GDP and distance from the water system.The forest land change is elevation and population.Other land changes are population and distance from townships.The expansion of construction land is Altitude and population.The interaction between GDP and distance from residential areas in Songming County has the greatest influence on changes in cultivated land and gardens,the interaction between GDP and distance from towns has the greatest influence on forest land changes,and the interaction between elevation and distance from towns has the greatest influence on the expansion of construction land The interaction between the distance from the residential area and the distance from the township has the greatest influence on other land.(3)At different scales,the effects of driving factors on land use change show some obvious differences.The influence of elevation and distance from towns and towns on the expansion of construction land shows great differences.The scale effect is obvious.The expansion of construction land at all scales of GDP and population has a great influence,and the scale effect is not obvious.For changes in cultivated land at various scales,the influence of GDP,elevation,distance from townships,and distance from settlements showed significant differences.For garden changes,the scale effect of GDP's driving effect is not obvious,and it has a greater influence on garden changes at all scales,while distances from towns and settlements show greater effects on garden changes at all scales.difference.