Research On The Spatial Differences Of Land Use Degree In Jia Yuguan City

Land use degree is one of the important indexes reflecting economical and intensive use of land.The spatial difference in land use degree is not only restricted by factors such as geographic location,social economy and population density,but also affected by the effect of scale.Because only the administrative boundary is not enough to accurately reflect this effect,this paper uses the method of resampling to study the spatial difference characteristics of land use in JiaYuguan City,in order to provide a basis for the rational use and effective management of land resources in JiaYuguan City.The results showed:(1)The dynamic change analysis of land use shows that in the past 20 years,the area of cultivated land,forest land,grassland,traffic land and urban and rural construction land in Jiayuguan City has increased,while the water area and unused land have shown a downward trend.(2)The land utilization rate,agricultural land use rate,forest coverage rate,land reclamation rate and construction land use rate in JiaYuguan City all increased in 2015.The degree of land use in the entire region was on the rise,which was in line with the trend of changes in land types.(3)The distribution pattern of land use degree in JiaYuguan City under the single index method and comprehensive index model in 1995,2005 and 2015 was consistent,and the areas with high land use were concentrated in the central,northeast,and southeast,including the eastern land of Qiquan Town.The change of land use degree showed polarization in the three sampling scales,and the conversion of strong and weak grades was obvious.At the same scale,the area occupied by strong grades increases year by year with the increase of the study period,while the weak grade has the opposite effect.Showing negatively correlated.(4)Moran's I values in 1995,2005,and 2015 were positive in three scales,and there was a high degree of positive correlation.In the single index system,the global autocorrelation of land use rate was the most significant.As the sampling scale becomes smaller and the sampling area increaseing,the more accurate the local spatial agglomeration reflected by the LISA map.After measurement at different scales,the 0.5km×0.5km sampling scale was the best grid unit for spatial analysis of land use.