LYU Zhiqiang,DENG Rui,QING Shanshan.Spatial Expansion and Topographic Differentiation of Urban Construction Land in Large Mountainous Cities[J].Research of Soil and Water Conservation,2017,24(01):232-238.
大型山地城市建设用地空间扩展及地形分异
- Title:
- Spatial Expansion and Topographic Differentiation of Urban Construction Land in Large Mountainous Cities
- Keywords:
- construction land expansion; mixed pixel decomposition; terrain gradient; large mountainous cities
- 分类号:
- F301.2;P208
- 摘要:
- 近年来，我国城市化进程已经进入加速发展阶段，城市建设用地日益紧张，对山地城市来讲，建设用地的供需矛盾尤为突出。以城市建设用地扩张的地形梯度变化为切入点，运用重庆市主城区2001年、2007年和2014年的遥感影像数据，通过混合像元分解提取建设用地。通过计算建设用地的分形维数、紧凑度指数和放射状指数分析了主城区城市建设用地扩张水平方向的形态变化特征；结合区域的高程、地形起伏度，分析了建设用地的地形分异特征。结果表明：城市规模扩展迅速，建设用地数量从2001年的237.62 km2增加到2014年的818.85 km2；综合分形维数指数、城市紧凑度指数、放射状指数来看，城市扩展从2001—2007年的紧凑型扩展发展转变成2007—2014年的外延扩展；主城区建设用地的扩展呈从低高程区的增长达到饱和状态向高程较高的区域发展的态势；从起伏度分析来看，建设用地无法向起伏度较大的区域大规模扩展。
- Abstract:
- The urbanization process in China has entered the accelerating stage in recent years, the urban construction land is increasingly scarce, especially in the mountainous city, the contradiction between supply and demand of construction lands is obvious. Based on the terrain gradient change of urban construction land expansion, we used remote sensing image data of the main urban area in 2001, 2007 and 2014 in Chongqing City to extract the urban construction lands by using the method of decomposition of mixed pixels. The fractal dimension of construction land, compact index and the radial index were computed to analyze the main urban construction land expansion form change characteristics of horizontal direction. Combining urban construction land with the regional elevation and relief, we analyzed the construction land differentiation characteristics of terrain. The results showed that the city scale expanded rapidly, and the area of construction land increased from 237.62 km2 to 818.85 km2 during the period from 2001 to 2014. With respect to comprehensive fractal dimension index, compact city index, the radial index in general, urban expansion is compact extension type, but during the period from 2007 to 2014, the urban expansion shifted toward the epitaxial extension type. Urban expansion appeared as compact extension type in the period from 2001 to 2007, but it turned to epitaxial extension type in the period from 2007 to 2014. The urban construction land in low elevation area reached to the saturated state, while high elevation area is a growing momentum, from the point of rolling degree analysis, construction lands are unable to expand to the larger area.
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备注/Memo
收稿日期:2015-12-15;改回日期:2016-02-01。
基金项目:重庆市社会科学规划培育项目（2014PY63）；国家自然科学基金（41101155，41301351）；重庆市教委科技项目（KJ1400623）；教育部人文社科项目（12XJCZH005）；重庆市高等学校青年骨干教师资助计划（2011）
作者简介:吕志强(1978-),男,山东莱芜人,博士,副教授,主要从事3S应用、环境遥感、资源环境经济与农村可持续发展研究。E-mail:lv0726@126.com