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  • Title: [Temporal and spatial variations of hydrogen and oxygen isotopes in Tuojia River and its influencing factors.].
    Author: Wu HB, Zhao Q, Qin XB, Gao QZ, Lyu CW.
    Journal: Ying Yong Sheng Tai Xue Bao; 2018 May; 29(5):1461-1469. PubMed ID: 29797878.
    Abstract:
    The characteristics of hydrogen and oxygen stable isotopes in river is important for regional hydrologic cycle research. To uncover water supply sources in subtropical agricultural basin from a perspective of stable isotopes, field measurements were conducted in four reaches (S1, S2, S3 and S4) of Tuojia River from April to August 2017. We analyzed the spatial and temporal variations in hydrogen and oxygen isotopes and deuterium excess parameters and their relationship with precipitation, altitude and water quality. Results showed that hydrogen and oxygen isotopes and deuterium excess values ranged from -43.17‰ to -26.43‰ (-35.50‰±5.44‰), -7.94‰ to -5.70‰ (-6.86‰±0.74‰), and 16.77‰ to 23.49‰ (19.39‰±1.95‰), respectively. Under the influence of monsoon circulation, hydrogen and oxygen isotopes showed substantial seasonal variation, with spring (δD: -29.88‰±3.31‰; δ18O: -6.18‰±0.57‰) > summer (δD: -39.25‰±2.65‰; δ18O: -7.32‰±0.42‰). The spatial distribution of hydrogen and oxygen isotopes values increased fluctuantly with the position from the sampling site to the river's source, with δD: S1＜S4＜S3＜S2, and δ18O: S1＜S3＜S4＜S2. The deuterium excess values had no significant temporal variation, while it spatially increased gradually with the river levels. The slope and intercept of water line in this river were smaller than that of the local meteoric water line, suggesting that precipitation was the primary water source for this river. At the seasonal scale, both δD and δ18O were significantly negatively correlated with water temperature (δD: r=-0.92; δ18O: r=-0.88) and δ18O was negatively correlated with altitude (r=-0.96). At spatial scale, δ18O had a significantly positive correlation with water temperature. The δD and δ18O had negative correlation with precipitation, but being not statistically significant. 河水氢氧稳定同位素特征是研究水体转化和示踪水循环过程的重要内容.为研究河水氢氧稳定同位素特征,揭示河水补给来源,于2017年4—8月对亚热带农业小流域脱甲河4级河段(S1、S2、S3和S4)水体氢(D)、氧(18O)稳定同位素进行了监测,分析其时空动态特征和过量氘(d-excess)的变化规律,并探讨了它们与降水、高程和水质等影响因子的相关关系.结果表明: δD、δ18O和d-excess的变化范围分别在-43.17‰～-26.43‰(-35.50‰±5.44‰)、-7.94‰～-5.70‰(-6.86‰±0.74‰) 和16.77‰～23.49‰(19.39‰±1.95‰).受季风环流的影响,δD和δ18O具有明显的季节变化特征,即春季(δD和δ18O为 -29.88‰±3.31‰和-6.18‰±0.57‰)>夏季(δD和δ18O为-39.25‰±2.65‰和-7.32‰±0.42‰);空间上,δD和δ18O表现出明显的沿程变化,随着采样点的位置到河流源头的距离波动增加,δD为S1＜S4＜S3＜S2,δ18O为S1＜ S3＜ S4＜S2.d-excess在时间尺度上无显著变化,在空间上随河流级别的上升呈下降趋势.脱甲河河水水线方程斜率和截距均略小于当地大气降水线,表明大气降水是河水的主要补给来源.相关分析表明,在季节尺度上,δD和δ18O与水温呈显著负相关(δD:r=-0.92;δ18O:r=-0.88);δ18O与海拔呈显著负相关(r=-0.96);在空间上,δ18O与水温呈显著正相关(r=0.98);δD和δ18O与降水量呈不显著负相关.
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