关键词: 哈密盆地, 荒漠, 绿洲, 地下水

Abstract: Consisted of oases and their surrouding desert plain and mountains, Hami basin is a typical oasis group, which develop and is being enlarged relying on ground water in arid land of China. Inthe baisn, there is a unique water cycling system characterized by local formation and transformation of water resources. Generally, there is no any runoff formed in the desert plain, the streams from mountains are the only water source entering the basin. Water permeates into the ground while the streams ren to the upper parts of floodplains composed of coarse granular materials, which in turn become the formation area of ground water. On the lower edges of the floodplains with even land and deep earth, the ground water spilled over sruface becomes the springs nourshing the oases looked like a green belt along the lower edges of the floodplain separate two defferent landscapes of dark Gobi at the upper part and the gray desert at the lower part of the basin. These plentiful oasis resources being the persistent lifeblood play a vital role in the development of social economy and the flourish of civilization in Hami.

Key words: Hami basin, Oasin, Desert