Landscape Dynamic Change Pattern of the Constructed Region:A Case Study of Guigang City,Guangxi Autonomous Region

Based on the topographic map in 1966,the aerial color infrared photographs in 1985 and 1997,and the QuickBird satellite image in 2004,according to the standard for plan and construction of city land use,the urban land use is divided into 11 landscape types.With the aid of GIS software and landscape pattern analysis software FRAGSTATS 3.3,the landscape spatial patterns are analyzed on the landscape level and class level.The landscape indices such as the size of patches,fractal dimension of patches,diversity index and evenness index are calculated.Results show that in the past 40 years the whole urban landscape of Guigang City has been more orderly and more diversified.The patch number and area of the communal facilities,municipal public utility and industrial estate,which signify the comprehensive development level of the urban,have risen year by year.In the recent 10 years the expansion speed of the urban constructed region has been becoming more rational which had gone successively through a fast development and a slow one,but some urban regions still remain to be utilized.With the fast urbanization,the space forms of the key elements of the urban landscape (including communal facilities land,industrial estate land,residential land and farmland) are further regular.But all the space distributions of the key elements show obvious fluctuation characteristics.In addition,QuickBird images have provided the high-resolution data for the urban research,which have good application prospects.How to relate the pattern changing characteristics to the urban ecological process and the urban ecological planning remains to be studied further in the future.