Abstract: There have been a large number of researches on spatial and temporal variation of hydrometeorological elements in Heihe River basin. Different test methods have different characteristics and advantages and the conclusions are always not the same. In order to address this problem, a hydrological alteration diagnosis system was used in this study, combining statistical analysis and physical origins, to analyze the trend and jump of runoff series of Yingluoxia and Zhengyixia hydrometric stations from Heihe River basin. Then the corresponding precipitation and air temperature series of seven meteorological stations in the upper and middle reaches of Heihe River basin were diagnosed to find out the physical origin of runoff alteration. The results indicated that the runoff series of Heihe upstream and middle reaches jumped in 1980 and 1990, and the precipitation and air temperature series were on the upswing. In terms of the physical origins of runoff series variation, the changes in climate conditions were the main factors affecting the upstream runoff alteration, but the diminution of runoff in middle area after 1990 was largely correlated with the sharp increase of water consumption in the middle part.

Key words: biomass., acid deposition, heavy metal, dioecious, phytoremediation