土壤盐渍化是产生坝上高原盐尘暴的主要物质来源，干涸湖区土壤盐渍化防控对于京津冀地区空气质量安全具有重要意义。本次研究以坝上高原察汗淖尔干涸湖区为例，探究地下水位埋深和溶解性总固体（total dissolved solids, TDS）与土壤盐渍化的影响，确定土壤盐渍化的地下水位防控阈值，为地表土壤盐渍化治理提供依据。室内实验获取研究区土壤含盐量、沙粒、黏粒百分含量，地下水TDS值，野外调查地下水位埋深，收集研究区蒸发量、降雨量资料，利用皮尔逊相关系数法及协方差矩阵分析选取线性关系较小的影响因素，绘制回归曲线探究土壤含盐量与地下水位埋深之间的关系。研究结果表明，TDS为0 ~ 1 000 mg/L、1 000 ~ 3 000 mg/L、3 000 ~ 6 000 mg/L、6 000 ~ 23 000 mg/L及0 ~ 23 000 mg/L时，土壤发生盐渍化的阈值分别为4.08、5.47、6.84、7.94、7.37 m；TDS为0 ~ 3 000 mg/L时土壤基本不发生盐化。TDS值为3 000 ~ 6 000 mg/L、6 000 ~ 23 000 mg/L及0 ~23 000 mg/L时土壤盐化阈值分别为2.05、2.44、1.97 m。本文研究利用回归分析，确定察汗淖尔流域平原区各TDS分区不同盐渍化程度对应的地下水位埋深，可针对性进行地下水位调控。

Soil salinization is the main material source of salt dust storm in Bashang plateau. The prevention and control of soil salinization in dry lake area is of great significance for air quality safety in Beijing-Tianjin-Hebei region. The effects of water table depth and total dissolved solids (TDS) on soil salinization were investigated, using the dry lake area of Chahan Nur on the Damshang Plateau as an example. The threshold of water table prevention and control of soil salinization was determined, and a basis for the management of salinization of surface soils was provided. The soil salt content, percentage of sand and clay, groundwater TDS value and groundwater table depth in the study area were obtained through laboratory experiments. The evaporation and rainfall data in the study area were collected. The influencing factors with small linear relationship were selected by Pearson correlation coefficient method and covariance matrix analysis. The regression curve was drawn to explore the relationship between soil salt content and groundwater table depth. The results show that when the TDS values are 0 ~1 000 mg/L, 1 000 ~ 3 000 mg/L, 3 000 ~ 6 000 mg/L, 6 000 ~ 23 000 mg/L, and 0 ~ 23 000 mg/L, the thresholds of soil salinization are 4.08, 5.47, 6.84, 7.94 and 7.37 m, respectively. When the TDS value ranged from 0 to 3 000 mg/L, soil salinization was not observed. When the TDS values were 3 000 ~ 6 000 mg/L, 6 000 ~ 23 000 mg/L and 0 ~ 23 000 mg/L, the soil salinization thresholds were 2.05, 2.44 and 1.97 m, respectively. In this study, regression analysis was employed to determine the groundwater table depth corresponding to different salinization levels in each TDS partition of the plain area of Chahannaoer Basin, and targeted groundwater table regulation could be implemented.