关键词: 黑河流域, 绿洲, 环境演变, 影响因素

Abstract: The natural and human factors that influence the oasis evolution of Heihe river basin are analyzed systematically based on the historical and modern research data.The natural factors include climate,geology,sand-blowing activity and natural disasters.The human factors include war,national custom,policy,traffic,economic position,population and needs for natural resources.Human factors are very complex,whose degree and extent are becoming more serious and larger with time in influencing the oasis evolution;and even could cover up the effect of the natural factors in certain conditions.As to the development of whole Heihe river basin the water conservation in the upper reaches and the ecological protection in the lower reaches must be firstly taken into consideration;the middle reaches as the emphasis region for economic construction.Only these three regions form complementary pattern and develop harmonized would the whole basin realize the sustainable development of resources,environment and economy.Key words:Heihe river basin;oasis;environmental evolution;influencing factors

Key words: Heihe river basin, oasis, environmental evolution, influencing factors