Analysis Of Spatiotemporal Changes And Driving Forces Of Cultivated Land In Yan’an City

Cultivated land is the foundation of national stability,the need of economic development and the key of ecological security.At the same time,cultivated land is also an important material foundation for realizing rural revitalization and an important foundation for promoting ecological civilization construction.But in recent years,with the development of economy,the increase of population and the decrease of per capita cultivated land,the scarce cultivated land resources in our country have become more in short supply,and the unreasonable use of cultivated land has caused a series of problems.Therefore,it is urgent to master the law and driving mechanism of cultivated land resources,overcome the uncertain factors of cultivated land utilization,and guide the scientific and rational utilization of cultivated land resources.Yan ’an city is located in the loess plateau of northern Shaanxi Province,which is a typical ecological fragile area and soil erosional sensitive area.Through in-depth study on the evolution law of cultivated land resources in Yan ’an city,it can provide important basis for rational utilization of land,optimization of territorial spatial layout structure,and promote the protection and sustainable development of cultivated land in Yan ’an City.Taking Yan’an City as the research area and taking the period from 2010 to 2020 as the time span,this study reveals the spatiotemporal changes of cultivated land in Yan’an City from the dimensions of quantity,spatial layout and utilization degree.Then,the principal component analysis method is used to analyze the 14 driving factors that affect the changes in cultivated land in Yan’an City,and a multiple linear regression model is used to test the selected factors,clarifying the role of different types of driving factors in the changes in cultivated land.This can provide important basis for farmland protection and pattern optimization.And on this based,countermeasures and suggestions are proposed.Through research,the following conclusions are obtained:(1)In terms of the number of cultivated land,compared with 2010,the area of cultivated land in Yan’an increased by 5.68% in 2020.The area of cultivated land per capita decreases.The contradiction between human and land is still acute.The dynamic degree of cultivated land utilization is maintained at a medium level.The stability of cultivated land resources in the northern part of Yan’an City is more favorable than that in the southern part of the whole region.The stability of cultivated land resources within the urban development boundary is generally poor.(2)In terms of the spatial distribution of cultivated land,the center of gravity of cultivated land in Yan’an has been shifting to the southeast as a whole in the past ten years,with the migration distance of 4388 m,and the migration rate has increased from187 m/a to 690 m/a,and the change rate of cultivated land has accelerated.The standard deviation ellipse also shows a trend of constantly shifting to the southeast.The area of the standard deviation ellipse shows a trend of constantly increasing,which is consistent with the change of cultivated land area.The cultivated land area in the study area presents a concentrated distribution,with a decreasing degree of agglomeration.The LISA map is mainly composed of "high high type areas" and "low low type areas",with a relatively stable spatial pattern.(3)In terms of the degree of cultivated land utilization,the overall change trend of cultivated land reclamation rate in Yan ’an has increased from south to north in the past ten years.The southern area is distributed with more woodland and high vegetation coverage,which leads to the land reclamation rate in the southern area being generally lower than that in the northern area.And the overall reclamation rate of Yan ’an city is lower than the national average level,the degree of cultivated land development and utilization needs to be further improved.(4)Among the driving factors of cultivated land use,the principal component analysis method is used to analyze the 14 driving factors,and the multiple regression model is used to test.Finally,it is concluded that the main factors affecting the change of cultivated land use in Yan ’an city are economic development,population size,industrial structure and the development of agricultural technology,which provides a reference for the protection of cultivated land resources in Yan ’an city and the development of cultivated land protection measures.