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中文摘要：
通过输入比初始土壤水富集轻同位素且同位素组成稳定的降雨进行室内降雨入渗实验，研究土壤水氢氧同位素在土壤中变化情况。实验结果表明，降雨在人渗过程中，降雨同位素与初始土壤水同位素发生混合稀释，出流同位素组成随时间减小，最后趋于稳定，接近降雨同位素组成；出流氢氧同位素关系线斜率由以初始土壤水和降雨同位素组成为端点的混合线斜率决定；通过曲线拟合出流同位素随时间的变化函数关系，确定其传递函数分布为指数-活塞流模型分布，且氢同位素和氧同位素的传递函数相同。
英文摘要：
Isotopic variations of soil water and rainfall are studied through rainfall infiltration experiments under isotopically depleted rainfall inputs condition. The isotopic compositions of rainfall and soil water mix in the process of rainfall infiltration, and the isotopic compositions of outflow decrease with time and then keep constant. The slope of hydrogen and oxygen isotopes of outflow is determined by that of mixing line connecting the isotopic compositions of rainfall and the initial soil water. Using curve fitting method to fit isotopic variations of outflow, it is found that the transfer function distribution of isotopic composition of outflow is exponential-piston flow model distribution, and the transfer function of hydrogen isotope is similar to that of oxygen isotope.
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