摘要
利用1989、1994、2000和2005年高分辨率遥感数据解译的土地利用数据,采用城市扩展强度指数、梯度分析等方法,分析了快速城市化阶段上海市中心城区城市用地扩展的时空特征.结果表明:研究期间,上海城市用地扩展迅速,城市扩展呈现"摊大饼"式的形态,城市用地扩展存在各向异性,城市的重心向西南方向移动了2.62 km.城市用地扩展强度成倍增长,扩展强度存在城乡梯度差异,城市扩展最激烈的地区位于城乡交错带,边缘型增长是上海城市用地扩展的主要方式,但城市用地在城市中心区域呈负增长.政府政策与决策支持、快速经济增长、社会固定资产投资总额、城市基础设施投资额、交通运输线路长度、城市非农业人口增加是城市扩展的主要驱动力.
Using the high spatial resolution （2.5 m） color-infrared aerial photos acquired in 1989, 1994, 2000 and 2005, this paper analyzed the spatiotemporal characteristics of rapid urban expan- sion in central Shanghai with urban expansion intensity index and gradient analysis. Results showed that urban land use in Shanghai increased rapidly in a ＂pancake＂ style during the study period, and the anisotropic urban expansion moved the urban center 2.62 km toward southwest. The urban land use expansion intensity doubled and showed a rural-urban gradient. The most intensive urban expansion zone fell in the rural-urban transition zone, indicating the dominance of peripheral expan- sion as the primary urban expansion mode in Shanghai. However, the urban land use intensity de- creased with time at the urban center. The primary driving forces of urban expansion included sup- port from government policies and decision-making, enhanced economic activities, societal fixed as- sets investment, urban infrastructure investment, extension of transportation routes, as well as in- crease in urban population.
出处
《应用生态学报》
CAS
CSCD
北大核心
2013年第12期3439-3445,共7页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(30770384)
教育部科学技术重点项目(106079)资助
关键词
城市化
土地利用
土地覆盖
城市扩展
城市扩展强度
驱动力
urbanization
land use/land cover
urban expansion
urban expansion intensity
driv-ing force.
