中文摘要：

2005年7月从黄河源头到渤海入海口沿黄河干流系统采集了24个水样,对水的氢氧同位素组成进行了分析。黄河水δD和δ18O值的变化范围分别为-91‰--44‰和-12.4‰--4.2‰,并且二者都表现出从上游到下游整体逐渐上升的趋势,但青海玛多样品除外。黄河水δ18O和δD的线性关系方程为δD=5.69×δ18O-15.51,其斜率5.69稍低于整个黄河流域雨水方程（δD=6.7×1δ18O-5.96）的斜率6.7,明显低于中国雨水方程的斜率7.9（δD=7.9×δ18O＋8.2）。黄河水氢氧同位素组成的分析表明,其δD和δ18O值的变化主要受黄河流域干旱自然环境的影响。当黄河流域大气降水降至地表成为地表水后,人类筑坝和工农业取水使径流量减少,水体受本身的蒸发作用和多次循环使用导致长时间停留地表产生进一步蒸发的双重影响。同时对黄河水ΔD值的变化也进行了讨论,表明该值反映出黄河水氢氧同位素组成受到了区域环境特征、降水云团在迁移过程中的变化趋势及区域性水汽循环参与程度等因素的影响。

英文摘要：

The H and O isotope compositions of water from the Yellow River were investigated in this study.Twenty-four samples were collected at 24 hydrological stations along the mainstream of the Yellow River,from the source region to the Bohai Sea,during July 2005.The δD and δ18O values of water samples vary from-91‰~-44‰ and-12.4‰~-4.2‰ respectively,increasing gradually from the upper reaches to the lower reaches,except the sample from No.1 station.The correlation between δD and δ18O follows an equation of δD=5.69δ18O-15.51.The slope of this equation（5.69） is slightly lower than that of meteoric water line for the Yellow River basin（δD=6.71δ18O-5.96）,and much smaller than that of meteoric water line in China（δD=7.9δ18O＋8.2）.It is inferred that the δD and δ18O values are affected mainly by the arid natural environment of the Yellow River.When precipitation in the area of Yellow River falls to the surface,the amount of runoff is greatly reduced by dams,industrial and agricultural water.The evaporation of the Yellow River itself and water circulation uses result in the detainment of water on the surface,which causes further evaporation.Meanwhile,the δD value variation of the Yellow River discussed in this study indicates that the hydrogen and oxygen isotopic compositions of the Yellow River water are affected jointly by regional environment,movement trends of precipitation clouds during migration process,and participation degree of regional water vapor circulation.