关键词: 黑河流域, 土地利用/覆被变化, 地理信息系统

Abstract: Taking composite Landsat 5 TM (Thematic Mapper) images of band 4，3 and 2 take n in 1988 and 2000 respectively as data sources，this investigation carried out studies on land use / land cover changes（LUCC）in Heihe River Basin according to land resources classification system of 1∶100 000 in Resources and Environmental Data base of Chinese Academy of Science．The results show that great changes have taken place in land use/land cover in Heihe River Basin during the period of 1988-2000：（1） Changes of land use structure show that cropland and urban and constructed land increased; but water body and grassland decreased．These changes reflect the deterioration of the eco-environment and the acceleration of urbanization，and also present the problems existing in the arrangement of water and land resources between upper and lower reaches of Heihe River．（2） Regional differences of land use/land cover are evident．In the upper reaches，water area decreased，and grassland and unused land increased to a great extent；however,the changes of forestland and urban land were not evident.In the middle reaches，cultivated land and urban land increased greatly．On the contrary，grassland decreased rapidly．In the lower reaches，water area shrank obviously，grassland degraded seriously，unused land increas ed largely，and the ecoenvironment was badly destroyed．The causes of LUCC and the approaches realizing sustainable land use were probed．

Key words: Heihe River Basin, land use and land cover change（LUCC）, geographical information system（GIS）