广西贵港市城市建成区景观格局动态变化研究

以高分辨率QulckBird卫星影像及航片为数据源，借助GIS技术平台获得广西贵港市4个时期城市景观类型图；运用景观格局指数定量分析城市景观格局的时空变化特征。分析结果表明，近40a来贵港市城市景观趋于有序多样化，表征城市综合发展水平的公共设施用地、市政公用设施用地和工业用地的斑块数和面积均逐年上升；建成区用地规模在经历了扩展过快和扩展不足的波动后，最近10a趋于合理，但仍存在一定程度的土地资源闲置现象；城市化过程中，城市主要景观要素（公共设施用地、工业用地、居住用地和农田）的空间形状表现出规则整齐的特征，而主要景观要素的空间分布特征具有明显的波动变化趋势。

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.