珠江三角洲城镇用地扩展的城市化背景研究

在分析珠江三角洲1990～2000年的城镇用地扩展现状的基础上,论文采用城镇用地的综合扩展系数将珠江三角洲划分为强扩展型、弱扩展型和相对稳定型3种变化类型。同时,根据城市化发展阶段的划分和城市化与城镇用地扩展耦合系数的研究,揭示了城镇用地扩展强度与城市化发展水平的关系。最后,进一步从城市化发展的空间格局入手,分析了城镇用地扩展的特征。研究表明,1990～2000年珠江三角洲城镇用地的扩展与城市化的发展水平和空间发展格局直接相关。城镇用地的强扩展区除集中在以广州、深圳和珠海为顶点的三角区域内和重要交通轴线两侧外,还表现出以广州、深圳和珠海为核心,向周边地区扩展强度与数量递减的规律。

Urbanization base of city-land use expansion in the Zhujiang River Delta

City-land use change(CLUC)in confusion during speedup urbanization is a common problem in many countries and also one of the best concerns of researchers.Correlative studies on it have signality in understanding mechanisms of CLUC and instituting policies of city-land use regulation.The author selected the Zhujiang River Delta in Guangdong,China,one of the regions with the highest level and the most rapid urbanization process as a case.Relations be-tween CLUC and urbanization of its courses,current status and special structure were discussed in this paper.And CLUC characters and trends under different levels,status and special struc-tures of urbanization also were analyzed.The paper first abstracted city-land use information from RS data of1990and2000in Zhujiang River Delta,and then revealed expansion characters and spatial disparities of city-land use.Also,by calculating synthesized index of CLUC(Ulc),28counties in investigated area were divided into3classes of CLUC:high expansion,low expan-sion and comparative stabilization.Meanwhile,the coupling relationship between CLUC and ur-banization was studied by comparing with relative urbanization levels of development.And cou-pling relationship in spatial structure between CLUC and urbanization was further dealt with.The main conclusions show the coupling relationship between CLUC and urbanization is quite good in Zhujiang River Delta from1990-2000.High expansion regions are centralized in the triangle with Guangzhou-Shenzhen-Zhuhai as its vertexes and in both sides along the main traffic lines.The trends of diminishing intension of CLUC are also showed from the cores centered around Guangzhou,Shenzhen and Zhuhai to the marginal areas.