基于GIS的喀斯特山区城镇建设用地空间扩展特征分析——以广西大化瑶族自治县为例

运用1988年、1999年的TM影像与1996年广西大化县土地利用现状图提取三个时段城镇用地空间数据,利用GIS技术的空间分析功能研究了1988-1999年来大化县城镇用地的空间扩展特征.研究结果表明:1988-1999年间,大化县城镇用地扩展明显.大化县城镇建设用地的增加81%以上来自耕地、林地和草地,增加了生态环境的压力.大化县城镇建设用地空间扩展以交通主轴线状城镇扩展模式为主.大化县城镇建设用地扩展的主要驱动力是国民经济发展、行政因素、交通条件改善、人口增加与水电、矿产等资源的开发利用.

Study on the Spatial-expanding Characteristics of Urban Construction Land-use in Karst Mountain Area Based on GIS——A Case of Dahua Yao Autonomous County of Guangxi

Three different temporal spatial information of urban construction land_use in Dahua county of Guangxi was extracted respectively from two Landsat TM/ETM~ images of 1988 and 1999 and from map of Land Use Actuality about Dahua county of Guangxi in 1996 respectively. Then the spatial_expanding Characteristics of urban construction Land use in Dahua county of Guangxi from 1988 to 1999 were analyzed by geography information system. The result showed that the spatial_expanding Characteristics of urban construction Land use in Dahua was distinct since 1988 to 1999. 81% of urban land_use growth was from farmland, woodland and lawn, which increased the environmental pressure in ecosystem. The spatial characteristic of urban land_use in Dahua is main transportation routes line_expending model. The main driving forces of urban land-use growth in Dahua included the development of national economy, administration factor ,the improvement of transportation, the population increasing and the exploitation of natural resources etc. hydropower, mineral.