泰州市建设用地扩展规律与格局演化研究

RESEARCH ON PATTERN OF THE CONSTRUCTION LAND GROWTH AND ITS EVOLUTION IN TAIZHOU CITY

以多时相Landsat、TM/ETM卫星影像为数据源,运用GIS软件提取泰州市建设用地1988～2008年5个时相的用地信息,运用扩展强度指数、扩展速度指数、空间自相关等方法分析泰州市建设用地扩展时空特征和演化规律。结果表明:(1)泰州建设用地扩展经历了缓慢扩展、中速扩展、缓慢扩展3个阶段,显示了建设用地逐步走向集约利用的趋势;(2)在分析泰州建设用地不同扩展阶段的基础上,发现泰州建设用地扩展模式正处于从点状扩展向点轴扩展转变阶段,并出现了网络化扩展的端倪;(3)运用空间自相关分析了泰州建设用地扩展热点演化过程,发现扩展热点呈现跳跃迁移的特征,热点区与冷点区出现交替演化,Moran散点图体现了泰州市建设用地扩展处于空间极化的状态,外围城镇受中心城镇增长极带动发展的扩展模式。

Based on multi-temporal Landsat TM and ETM satellite images,with the help of GIS software,the article extracted the construction land information of Taizhou City and analyzed the expansion and evolution law of construction land by using expansion index and spatial autocorrelation index during the years from 1988to 2008.The results show the expansion of construction land in Taizhou has experienced three stages from slow increase,then a rapid rise to a sharp decline.It indicates that the expansion of construction land towards the trend of intensive utilization gradually.By analysing the process of construction land expansion,based on the different features of the various stages of construction land expansion,the article found that the expansion model was changing from point of expansion to inter-axis of expansion and the emergence of network expansion clues.By spatial autocorrelation analysis of the expansion of hot spots,it found that expansion of hot spots showed the characteristics of migration,and that hot zones and cold zones changed mutually.Moran scatterplot reflects that the construction land expansion is on the state of space polarization,and that center towns of city prompt the expansion of peripheral towns.