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溶滤和蒸发作用是内陆干旱盆地平原区松散沉积层地下水咸化的主要原因。地下水的ＴＤＳ直接表达了其咸化程度，δ１８ Ｏ值的变化主要受蒸发作用影响。在地下水ＴＤＳ－δ１８ Ｏ关系图中，以各样点为起点，做蒸发线的平行线，与溶滤线交于ｃ点，则ｃ点两侧的ａ 段和ｂ段分别代表溶滤和蒸发作用对该样品的咸化贡献。ａ＝ （ＴＤＳ３ － ＴＤＳ１ － ｂ）／（ＴＤＳ３ －ＴＤＳ１ ）×１００，ｂ＝ ｋ（δ１８Ｏ３ － δ１８Ｏ１）／（ＴＤＳ３－ ＴＤＳ１）×１００％ 。该方法应用于塔克拉玛干沙漠地下水咸化特征的分析，证明虽气候干旱，蒸发作用强烈，但地下水的咸化仍以溶滤作用为主。
Leaching and evaporation are the main reasons for the salinization of loose sediments in the plains of the inland arid basin. The TDS of groundwater directly expresses its degree of salinization, and the change of δ18O value is mainly affected by evaporation. In the TDS-δ18O diagram of groundwater, taking the various points as the starting point, the parallel lines of the evaporation line are made to intersect with the leaching line at point c, and the sections a and b on both sides of c point respectively represent the leaching and the evaporation Effect on the sample’s salty contribution. a = TDS3 - TDS1 - b / TDS3 - TDS1 × 100, b = k (δ18O3 - δ18O1) / (TDS3 - TDS1) × 100%. This method was applied to the analysis of the saltwater characteristics of groundwater in the Taklamakan Desert. It is proved that the salinization of groundwater is dominated by the leaching process, despite the arid climate and strong evaporation.