摘要
利用南京市1988、1998、2003和2006年的LandsatTM遥感影像,采用邻域分析方法,提取1988—2006年间3个时段南京地区聚落占地率变化速率最快的5%区域作为聚落动态的热点,并对其空间分布格局的变化规律进行了研究。结果表明:聚落增长热点和萎缩热点总体上随城市的扩张而外移,其中,增长热点主要发生于建成区边缘外侧6km以内的区域,而萎缩热点的高发区位于建成区边缘外侧1km以内,在城乡梯度上二者都随离建成区边缘距离的增加而减少。在不同方向上,热点发生的频度、幅度具显著的差异性,且表现出易受短期城市发展决策的影响,阶段性重点开发地区往往成为聚落变化的热点,并导致热点集中分布区位的阶段性差异。某一时期萎缩热点在空间上集中分布的区位往往是前一时期增长热点集中发生的区位,反映了城市化过程中聚落快速增长后可能伴随着相对较大规模的重组、整合过程。
Based on the multi-temporal Landsat TM images in 1988, 1998-, 2003 and 2006, and by using neighborhood analysis, the top 5 % areas with the quickest change rate of settlement per- centage coverage in Nanjing in 3 periods of time in 1988-2006 were picked up as the hotspots, aimed to study the settlement dynamics in the urbanization process of the City. The results showed that with urban expansion, both the growth hotspots and the shrinking hotspots in Nanjing exhibited an overall outward-shifting tendency. The growth hotspots mostly located in the regions 6 km from the fringe of urban buih-up areas, while the high-occurrence zone of shrinking hotspots was located in the regions 1 km from the fringe of the built-up areas. Moreover, the areas of the two kinds of hotspots declined with the distance along the urban-rural gradient. The intensity and range of the hotspots varied significantly among different directions, and tended to be influenced by the short-term urban development decisions. At some specific stages, the primary urban development zones generally presented in growth hotspots, which resulted in the temporal variation of hotspot-concentrated locations. The shrinking hotspots were concentrated in the areas experienced growth hotspots in previous periods, indicating that relatively extensive settlement reform and integration could occur after the rapid settlement growth in urbanization process.
出处
《生态学杂志》
CAS
CSCD
北大核心
2009年第3期503-508,共6页
Chinese Journal of Ecology
基金
国家自然科学基金资助项目(30870433,40801068)
关键词
城市景观
邻域分析
城乡梯度
聚落占地率
urban landscape
neighborhood analysis
urban-rural gradient
settlement percentage coverage.
