近三十年乌鲁木齐市建成区的时空动态变化分析

Urban Expansion and Spatial Features of Urumqi City during the Last 30 Years

采用1975年、1990年、2000年和2004年四期陆地卫星影像资料,在遥感、GIS和分形理论的支持下,对乌鲁木齐市建成区的土地利用结构、空间格局动态变化进行了定量研究。结果表明,1975年到2004年乌鲁木齐建成区面积扩张显著,四期的计盒维数分别是1.5552、1.6161、1.6969、1.6947。1975年到2000年扩展以向四周扩展为主,到2004年期间,则以表现出线性扩展的特点。城市扩展的初期是以占用草地为主,后来转变为以占用耕地为主,2000年以后则主要以占用农村居民点和工交建设用地为主。

Based on Landsat TM images of 1975, 1990, 2000, and 2004, urban land-use structure and spatial dynamics of Urumqi were studied using RS, GIS, and fractal theory. The results showed that ： significant sprawls of urban land use were found in Urumqi from 1975 to 2004; the box-counting dimension for each year was 1. 552, 1. 6161, 1. 6969, and 1. 6947 respectively; From 1975 to 2000, urban land use expanded almost to all directions, but it expanded with a more linear like trend from 2000 to 2004 ; In the first stage of the study periods, the urban land use expansion was mainly obtained from the grassland, and then mainly occupied cultivated land, whereas in the last stage, the expanded urban land mainly came from the rural residential area and construction area.