快速城市化地区土地利用变化研究--以广东省东莞市为例

Analysis of Land Use Change in Rapidly Urbanized Area——A Case Study of Dongguan City,Guangdong Province

以东莞市为研究区域,利用1988年、1995年、1998年、2002年和2005年5期不同时相的Landsat TM/ETM+遥感影像,从土地利用变化幅度、土地利用变化速率、土地利用重心转移和土地利用变化空间分异特征四方面探讨了研究区的土地利用变化。结果表明:(1)1988—2005年,东莞市土地利用变化总的态势是耕地大幅减少、城镇用地迅速扩张,大量的农业用地转化为城镇用地,城镇用地快速扩张和耕地大量流失是研究区土地利用变化的主要特征。(2)从土地利用变化的空间特征来看,各土地利用类型重心的转移距离都较大,且农业用地的重心转移方向和城镇用地重心转移方向大致相反;耕地分布的空间正相关性明显减弱,城镇用地分布的空间正相关性明显增强。

Taking Dongguan City as the study area and applying satellite images of the Landsat TM/ETM＋ in five different periods,including 10 December,1988,30 Decemember,1995,22 December,1998,7 Novemebr,2002 and 23 November,2005,we discussed characteristics of land use changes from four aspects including the amount change,change velocity,gravity migration and spatial differentiation.The main results are as follows ：（1）during 1988—2005,land use change was indicated by decreasing cultivated land and expanding urban land because a great amount of cultivated land changed into urban land.Rapid expansion of urban land and huge loss of cultivated land are main features of land use change in the study area.（2）Changes also are represented by characteristics of migration of land use critical center and spatial autocorrelation of land use： critical center migration directions of agricultural land are generally opposite to that of urban land,and spatial autocorrelation of cultivated land is reducing and that of urban land is enhancing.