中文摘要：

以快速城市化的苏南地区为研究对象，以揭示城市扩张的过程和效应为目标，利用多时相卫星遥感影像数据，以扩张强度、扩张速度指数反映扩张过程及格局，以分形维数、紧凑度指数等反映城市形态和位序一规模的变化过程，对影响苏南地区城市扩张的因素和机制进行探讨。结果表明：改革开放以来苏南地区城市扩张的热点区域发生了变化，呈现由分散到集中再到分散的过程；东西两翼地区整体扩张速度较快，东部地区的持续高速扩张推动了苏南地区“哑铃型”城镇体系格局的形成；城市形态相对紧凑，但随着时间推移有趋于不规则、不稳定、不紧凑的态势，中部地区城市紧凑度下降较大。地区生产总值、实际利用外资总量、城镇固定资产额、常住人口等的增长直接导致了城市建成区面积的扩大，全球化、区域政策、区位条件、后发优势等是影响城市扩张热点形成、变化和位序规模改变的主要原因，而沿轴线扩张主导的模式则影响了城市形态的变化。

英文摘要：

Urbanization is one of the most importance affecting factors for regional sustainable development and modernization construction. Taking rapid urbanized Southern Jiangsu Province as the case area,multi- temporal remote sensing images were used to indicate the process, pattern and effects of urban expansion. Expanding intensity and speed of urban construction lands were adopted to indicate the process of urban expansion,and fractal dimensions,compactness index were used to indicate the changes of urban form and rank-size distribution since reformand opening up. Results indicated that the hotspots of urban expansion experienced the process of ＂Dispersing-Clustering-Dispersing＂. Faster urbanization of cities at the two wings, and especially at the east part, promoted the formation of dumbbell-style urban pattern. The urban form was always at the intermediate state between extremely complex and regular,but was with the trend of being more irregular, more unstable and looser. Compactness of the middle cities declined faster than that of the eastern and western cities. It was concluded that the globalization, regional strategies,locations, and advantages of backwardness were the major influencing factors for the changing of hotspots and rank size distributions, which played different importance role at relevant stages. The dominated expanding pattern along certain development axes was of significance for the change of urban form.