合肥市近19年来土地利用格局的时空变化分析

Spatio-temporal Changes of Land-use in Hefei during Past 19 Years

利用Landsat TM、ETM+、CBERS—2资源卫星数据,采用基于知识型光谱特性的增强与人机交互解译相结合的方法,提取了合肥市1987年、2000年和2006年土地利用类型的专题信息。利用GIS空间分析技术和数理统计方法,分析了合肥市近19年来的土地利用变化特征。结果表明:①在整个阶段—耕地减少了23.38%,建设用地增加了61.26%;城镇用地新增速度最快,且新增速率远大于转移速率,属高速扩张型;②区内最"敏感"的类型是交通用地,其新增速率在两个阶段分别达到1.64和1.62,远高于其它的类型;④从城市扩展的方向上看,合肥城市的发展主要以西南部、南部和东部为主,西南部最为明显;城市已经形成以老城区为核心,向东、北、西南三翼伸展,形成"南进—东拓—西缓—北抑"的空间发展布局。

In the past 19 years, while China＇ s urbanization was fast- developing, a series of problems related to urbanization were there upon production.In this paper,based on spectrum characteristic of knowledge method,the thematic information of three periods of LUCC were extracted from Landsat TM,ETM ＋ and CBERS- 2. Combing with the GIS technology,the land- use transfer matrix from 1987 to 2006 were obtained. Be- sides,the LUCC models were applied to analyze the characteristic of land use change from 1987 to 2006. Based on the land- use change map and land- use transfer matrix,spatial dynamic characteristic and land- use conversion of the study area were analyzed.The research could provide suggestions for land management and making policy for local government.