关键词: 土地利用/覆盖, 时空变化, 乌鲁木齐河下游地区

Abstract: Based on analyzing and interpreting the TM and ETM + remote sensing images at three temporal stages in 1989, 1999 and 2007, the land use/ cover change in the are of lower reaches of Urumuchi River in recent 18 years, in both spatial and temporal aspects, was studied with the tools of geographical information system ( GIS) . Conclusions are drawn as follows: From 1989 to 2007, the built-up area increased and urbanization in study area was obvious. The area of farmland, grassland and woodland increase in recent 18 years and the area of salinity and water extende quickly in the 1990s. By analyzing the indexes of individual land use/ cover dynamic change, it is found that both the gain rate and the loss rate of woodland are high for the lower survival rate of the local plantation. Meanwhile, there is notable difference of land use/cover change among districts. Urbanization in Shuimogou District and Xinshi District are most significant in recent 18 years.

Key words: land use/ cover, temporal and spatial change, lower reaches of Urumchi River