【摘要】 基于Landsat遥感影像，利用生物物理成分指数(Biophysical Composition Index, BCI)对2001-2020年重庆市中心城区不透水面进行提取，分析不透水面扩张时空变化及其扩张驱动力.结果表明：(1)研究区2001-2020年间不透水面扩张显著，表现为“急速扩张—低速扩张”.(2)空间变化上，不透水面以中心城区为圆心向城市外延扩张，呈现多中心组团式发展；2016年以前不透水面主要以北、东北方向扩张为主，2016年以后则呈现出多方位低速扩张.(3)不透水面景观格局破碎化增大，景观异质性增强，不透水面由聚合式扩张转变为向城市外延分散式扩张.(4)经济发展、产业结构、人口规模和交通设施与中心城区不透水面扩张变化密切相关.更多还原

【Abstract】 The central urban area of Chongqing was taken as the research object, and remote-sensing imagery of Landsat series were used to extract impervious surfaces by means of biophysical composition index(BCI). Then the spatial temporal changes of impervious surfaces during 2001-2020 and the driving forces were analyzed. The result indicated:(1) The impervious surface of the study area expanded significantly from 2001 to 2020, demonstrating an expansion trend of high rate to low rate.(2) In terms of spatial changes, the impervious surface expanded outward of the city with the central city as the center of the circle, showing a polycentric cluster development. Before 2016, the impervious surface mainly expanded in the north and northeast directions, and after 2016, it showed a multi-directional low-speed expansion.(3) The landscape pattern of impervious surface showed a fragmentation trend, with the transformation from the convergent expansion to the dispersed expansion towards the urban extension. The landscape heterogeneity of impervious surface was increasing.(4) Economic development, industrial structure, population size and transportation facilities were closely related to the changes in impervious surface expansion in the central city.更多还原