快速城市化过程中石家庄市景观格局变化研究

城市化过程通过改变地表景观结构而改变城市环境质量,因此研究城市景观格局及其变化具有重要意义.以石家庄市为例,基于遥感、GIS和Fragstats软件分析景观类型特征及变化.结果表明,研究时段内除农田植被和低密度不透水面面积及比例减少外,其余景观类型呈扩张趋势,高密度不透水面扩展最快.低、中密度不透水面景观边界复杂化,内部复杂斑块比例减小;高密度不透水面边界简单、内部斑块复杂、连通性增强;未利用地边界复杂,斑块团聚;城市植被和水体形状变化不显著,聚集程度上升,但连通性变化相反.扩张景观类型的扩张指数大小顺序为:高密度不透水面,未利用地,城市植被,水体和中密度不透水面.

Landscape Change Analysis of Shijiazhuang during Rapid Urbanization

Landscape change in Shijiazhuang has been analyzed based on two scenes of Landsat 5 TM satel-lite images recorded on 1987 and 2010 .Images have been classified into seven landscape types and been cal-culated landscape area and their percentage for describing landscape characteristics and change detection . Class level landscape metrics and landscape expansion metrics have been calculated ,and the most appropri-ate landscape metrics been selected by principal component analysis .Results show that 1) only cropland and low density impervious surface area has decreased during this period ,and high density impervious sur-face is the major landscape type in 2010 instead of cropland in 1987 ;2) all landscape types transferred to high density impervious surface to various certain extents ;3) landscape boundary status of low and middle density impervious surface has become complex and the proportion of internal complex patches reduced , and high density impervious surface had simple landscape boundary ,complicated internal patches and en-hanced connectedness ,and landscape boundary complexity and patches agglomeration of unexploited land increased ,the shape of green space and water body has not remarkable change but the aggregation degree increased ,they have contrast changing in connectedness ;4) at last ,expansion ranking of five expanded landscapes is high density impervious surface >unexploited land>green space>water body>middle densi-ty impervious surface .