Analysis of spatial-temporal differentiation and influence factors of construction land expansion of the urban agglomeration in central Yunnan

Abstract

This paper takes the plateau mountain city: the urban agglomeration in central Yunnan as the research area, 2000-2015 as the research period, and measure and analyze the spatio-temporal differentiation of construction land expansion in the urban agglomeration based on the calculation of kernel density. Use the spatial autocorrelation model to analyze the spatial autocorrelation patterns of construction land on the 1 km × 1 km grid scale, and then use the GIS spatial analysis technique to study the local aggregation area at the p<0.05 significance level of the construction land in relation to natural and social driving factors. The result shows that the growth and distribution of urban construction land in this urban agglomeration is affected by natural social factors and land policies, and the area of construction land is growing rapidly. The areas with large distribution density of construction land at four time points are mainly located in flat dam area in the central and eastern part of the urban agglomeration, and mountain in the northern part. The spatial distribution of construction land in this urban agglomeration from 2000 to 2015 is mainly represented by two patterns: high-high aggregation and low-low aggregation. The topographical features dominated by plateau mountains affect the local spatial clustering of the construction land. At 4 time points, the elevation is 1000∼3000 m, the slope is between 2°-25° and the sunny slope area is the area with the largest distribution and the most concentrated area of the construction area. The farther away from the water system and the road, the local space gathering area of construction land is decreasing.