徐州城市建设用地空间格局特征及其演化

Spatial pattern and evolution of urban construction land in Xuzhou

基于1979年、1994年、2003年、2008年徐州城市土地利用现状图,构建研究区居住、工业和商业及公共服务(商服)用地图层,在此基础上运用基于矢量单元的圈层分析、扇形分析和基于栅格单元的空间韵律分析技术,分别从距离、方位和空间格局关系等方面分析了徐州城市建设功能用地空间格局。研究表明:(1)工业和居住用地的波峰位置和增长区域均有外推,工业用地的置换由城市中心区向外逐步展开;居住用地自1994年以来由中心区向外减少,商服用地波峰位置和增长区域没有明显外推,没有形成连续的增长区域。(2)工业用地持续向老工业区集中和向城市外围快速扩展,居住和商服用地则向环境优美方位及城市主导方向快速扩展。(3)随着城市的快速扩展,城市功能用地由离散扩展关系过渡为粘合扩展关系;商服用地发展相对缓慢,且更大程度地服务于工业,和工业用地表现出粘合扩展关系。

Based on maps of urban land use in 1979,1994,2003,2008,1∶50000 topographic map in 1994 of Xuzhou,with reference to the latest national standards of the land-use status classification（GB/T21010-2007）,urban construction land was identified into residential land,industrial land,commercial and public service land,a vector database of the urban construction land was established and the 10m×10m grid database was generated by re-sampling in Xuzhou urban area.Then a spatial study on the urban construction land of Xuzhou was carried out in the aspects of distance,orientation and spatial pattern relationship,using the methods of GIS such as circle-layer and fan-shaped analysis based on the vector database,and spatial rhythmic analysis based on the grid database.The results were obtained as follows.（1） The line charts of distance about all the three types of urban construction land had the same process of changing from single-peak to multi-peak;both the crest location and the growth area of industrial and residential land had a trend of developing outward;industrial land replacement was steadily developing from the city center to the outer city;residential land had been decreasing within a scope of 0-5 km from the city centre since 1994;by contrast,the commercial and public service land had not a trend of developing outward and its growth had no continuity.（2） Commercial and public service land developed relatively slowly in each orientation;industrial land expanded steadily to the northeast industrial area and the northwest and south outer city;residential land and commercial and public service land expanded rapidly to the beautiful southeast which was set as the dominant orientation of the city.（3） With the rapid development of the city,the three types of urban construction land formed a relationship of discrete extension,then a relationship of cohesive extension;under the effect of the heavy industry,the commercial and public service land,which developed slowly and served industry to a large degree,and the industrial land displayed a relationship of discrete extension,and the characteristic that the industrial area and residential land separated from each other was relatively distinctive.