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中文摘要：
通过土壤混合实验和土柱垂向稀释实验，探讨土壤混合与稀释过程中氢氧稳定同位素浓度变化规律，检验应用同位素进行流量过程线分割中一基本假定“土壤水对流量过程线的贡献可以忽略，或者其同位素与地下水相同”的合理性。实验结果显示，土壤与降水混合稀释过程中，δD和δ^18O值随时间呈线性关系变化；在应用同位素分割流量过程线时，忽略土壤水对流量过程线的贡献是不合理的。
英文摘要：
The principle of hydrogen and oxygen stable isotopic concentrations variations in soil water mixing and dilution is discussed through soil mixing and soil column dilution experiments. Test the rationality of assumption which is ＂contributions of water from the vadose zone must be negligible, or the isotopic content of soil water must be similar to that of groundwater＂ on hydrograph separation. The experimental results show that the relationship between δD and δ^18O values is linear , varying with time in the mixing and dilution between the soil water and precipitation , and that ignoring contributions of water from the vadose zone is irrationality in hydrograph separation.
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