重庆旧城改造区土地覆被与景观格局变化——以北碚区为例

Land Cover Transformation of the Old City District and Landscape Pattern Change—A Case Study of Beibei District of Chongqing

以重庆市北碚区为例,以2001、2006和2011年三个时期的土地利用变更调查数据库数据为基础数据,借助GIS技术,对旧城改造区的土地利用/覆被与景观格局进行分析,结果表明:2001—2011年的10年期间,区域始终以农用地为主要覆盖类型,一级农用地变化幅度不大,农用地下的二级地类发生较大转变,其他农用地向林地及园地发生大幅转化,主要原因是北碚规划建设生态型新城区;建设用地不断增加,到2011年达到区域18.03%占有量,建设用地主要由未利用地转化而来;2001—2011年,区域景观破碎度呈现由小破碎度到大破碎度再到小破碎度的趋势,到2011年破碎度达到最小值;区域各地类的分维数呈现增加趋势,说明自然景观受人为因素的影响越来越大。

Beibei District of Chongqing city was exemplified in this work. Based on the database of land use change of2001,2006 and 2011, GIS technology was used to analyze the transformation of the old city area of land use / land cover and landscape pattern.The results suggest that this region has mainly been utilized as agricultural land, as the main cover types, from 2001 to 2011. It has also been realized that a little change of agricultural land and substantial transformation of underground two level land types has taken place, and there are some other agricultural land transferring to woodland and garden, because Beibei has been planning newly ecological urban construction. The area of building land has been increased by 18.03%, 2011 yet. Those occupied areas was mainly derived from unused land. From 2001 to 2011, The evolutionary trend of the regional landscape fragmentation draw an interesting cycle which is transferring from small fragmentation to large and retreating to small again at end. Considerably, at 2011, the fragmentation achieves the minimum value, which tells that the natural landscape has been affected by human activity more and more.