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城市建设用地的扩张是一个复杂的动态性过程,受多种因素的影响。以青海省西宁市中心城区为例,根据1999年、2003年、2009年3期的Landsat影像数据提取了研究区的土地利用信息,通过GIS技术分析10年间建设用地变化的动态信息,得到建设用地扩展侵占耕地、草地、其他用地的面积及空间分布,然后从人口变动、经济增长、政策制定3方面分析对西宁市中心城区建设用地扩展产生的驱动作用。研究表明,人口和经济因素是城市建设用地向外扩张的主要因素,政策因素在城市的发展过程中起着导向作用。
The expansion of urban construction land is a complex dynamic process, which is affected by many factors. Taking the central urban area of Xining in Qinghai Province as an example, the land use information of the study area was extracted based on the Landsat image data of 1999, 2003 and 2009, and the dynamic information of the construction land use change during 10 years was analyzed by GIS technology to obtain the construction land Expand the area and spatial distribution of invaded arable land, grassland and other land, and then analyze the driving effect on the expansion of construction land in central urban area of Xining from the aspects of population change, economic growth and policy making. The research shows that the population and economic factors are the main factors for the outward expansion of urban construction land. The policy factors play a guiding role in the urban development.