广西西江沿岸后备适宜建设用地潜力及空间分布

测算和评价后备适宜建设用地潜力是区域工业化和城镇化发展的重要基础工作之一。论文在建立后备适宜建设用地潜力多要素分步式算法及技术流程的基础上，借助GIS 空间分析技术，利用1：5 万DEM数据、1：10 万土地利用图、县级行政区划图和各类保护区分布图，测算和评价了广西西江沿岸20 km 范围内及沿江主要城市周边后备适宜建设用地的数量、等级和空间分布特征。研究结果表明：广西西江沿岸20 km范围内后备适宜建设用地面积为1 962.64 km²，占土地总面积的比重为4.82%；来宾和柳州接壤的柳江东岸存在一个后备适宜建设用地富集区域，具有成片集中开发利用的前景。南宁和柳州2 市城区周边的后备适宜建设用地数量较为丰富，具备进一步规模性开发和建设的用地条件；百色、崇左、来宾、贵港和梧州5 市城区周边的后备适宜建设用地潜力相对较为有限，未来建成区规模的拓展应适当控制。

Potential and Spatial Distribution of Suitable Construction Land along the Xijiang Riverside in Guangxi

As an important and basic research on regional industrialization and urbanization development, study on calculation and assessment of the potential suitable construction land is an essential work. Based on multifactor distributed algorithm and extracting process of potential suitable construction land and GIS spatial analysis techniques, by using 1:50000 DEM data, 1:100000 land use data, county-level administrating data and distribution data of all kinds of nature reserves, the article assessed the amount, grade and the spatial distribution characteristics of potential suitable construction land of Xijiang River within a range of 20 km in Guangxi Zhuang Autonomous Region and seven urban areas along Xijiang Riverside. The results show:1) As an essential component and axis of industry and population agglomeration of Guangxi Xijiang River Economic Belt, there is plenty of potential suitable construction land along the Xijiang Riverside, which is able to meet the demand for cities or towns' expansion, as well as the distribution of local industry parks and the infrastructure construction. Therefore, it is necessary to evaluate the regional differentiation of potential suitable construction land, especially specific development and construction project.2) The area of the available construction land in Xijiang River within a range of 20 km is 1962.64 km², which is 4.82% of the region's total. The area of the potential suitable construction land of Xijiang River with the ranges of 5 km, 5－10 km, and 10－20 km are respectively 617.30 km², 495.31 km², and 850.03 km². Overall, the potential suitable construction land of the east coast of Liujiang River is plentiful, allowing the development of the future industry and population agglomeration.3) The senven urban areas along Xijiang Riverside in Guangxi have considerable potential suitable construction land, which needed to implement classification guiding principle. The area of the potential suitable construction land of Nanning and Liuzhou along the Xijiang River within a range of 16 km is 205.49 km² and 203.01 km², with more than 70% being the most suitable construction land of the total and best-quality, hence possibly for the further large-scale development and construction. While there are limited potential suitable construction lands in Baise, Chongzuo, Laibin, Guigang and Wuzhou along the Xijiang Riverside within a range of 12 km, with areas ranging between 40－60 km². This means appropriate controls are necessary for government to restrict the expansion of cities and towns.