石羊河流域降水稳定同位素变化的区域差异

为了了解干旱内陆河流域降水稳定同位素变化过程及其影响因素，基于石羊河流域荒漠区、绿洲区和山区8个站点2013年7月至2014年7月，497个降水样品氢氧稳定同位素数据及相应气象数据，研究了石羊河流域降水稳定同位素的时空变化、环境效应以及降水水汽来源.结果显示：石羊河流域局地大气水线斜率和截距表现出夏低冬高的变化趋势；降水稳定同位素表现出夏高冬低的变化趋势，从荒漠区、绿洲区到山区，稳定同位素值随海拔升高而降低，海拔效应为-0.22‰/100m，这是温度效应的另一种体现；流域降水稳定同位素表现出显著的温度效应，温度效应为0.43‰/℃，在天气尺度下受季风水汽和降水淋洗过程的影响表现出降水量效应；流域降水来源主要受西风水汽控制，夏季也会会受到季风水汽影响，冬季也受到极地气团影响.

Precipitation stable isotope regional difference in Shiyang River basin

In order to better understand the changing process of precipitation stable isotope and its influencing factors in arid inland river basins, based on the oxyhydrogen stable isotope data and corresponding meteorological data of 497 precipitation samples from 8 stations in desert area, oasis area and mountain area of Shiyang river basin from July 2013 to July 2014, the spatiotemporal change, environmental effect and water vapor source of precipitation stable isotope of Shiyang river basin were studied. The slope and intercept of the local atmospheric water line in Shiyang river basin showed the trend of low in summer and high in winter. The stable isotope of precipitation showed the trend of high in summer and low in winter, the value of stable isotope decreased with the increase of altitude from desert area, oasis area to mountain area, and the altitude effect was -0.22‰/100m, which was another manifestation of the temperature effect. The stable isotopes of precipitation in the basin showed significant temperature effect with a variation range of 0.43‰/℃, and the precipitation effect was shown under the influence of monsoon water vapor and precipitation washing process on the weather scale. The source of precipitation in the basin was mainly controlled by the west wind water vapor, summer and winter will also be affected respectively by the monsoon water vapor and the polar air mass.