Abstract:

On the lower reach of Damagou River in Tarim Basis, there was a desertified area once an oasis, it was about 80 square kilometers. On the ancient oasis area, many relics were scattered, such as Huyangdun Buddha temple ruins, Tuopulukedun Buddha Temple ruins, Big Graveyard, Huyang Graveyard, Kalaqin Ancient City, and Sipier Ancient City. The textual research shows the Kalaqin Ancient City was Kanchengzhen (Kanzhou) in Tang Dynasty, also the Phema City. In those years, the Kalaqin Ancient City was of a large population, commercially developed, and prosperous for Buddhism, but abandoned and desertified after 790 A.D. The Sipier Ancient City was the former capital of Qule State in Han Dynasty, but also abandoned and desertified in late Wei and Jin dynastys. The author analyzed two stages of desertification in the ancient oases and its causes.

Key words: lower reach of Damagou River, ancient oases, desertification, Kalaqin Ancient City, Sipier Ancient City