LAND EVOLUTION IN ALPINE INLAND RIVER BASIN FROM 1980 TO 2020 ON THE NORTHEASTERN TIBETAN PLATEAU, CHINA

Based on GIS and remote sensing technology, land use change in the northeastern Qinghai-Tibet Plateau was analyzed. The results showed that the grassland area in the Qinghai Lake Basin increased significantly and the barren land area decreased significantly from 1980 to 2020. In the past 40 years, the area of grassland in the Qinghai Lake Basin has increased by 3094 km(2), and the area of barren land in the basin has decreased by 3058 km(2). From the land transfer matrix, the change in the area was mainly due to the transfer of water area to barren land from 1980 to 2000, which its area was about 327 km(2), and the rest of the land types did not change much. However, from 2000 to 2020, the land use type shift proceeded to change significantly, among which the shift of grassland and barren land is the most significant, showing a shift from barren land to grassland.