Response of Soil Salinization to Groundwater Level in Dry Lake Area of Chahannaoer
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.
salt dust stormChahannaoersoil salinization degreegroundwater depthregression fit
万方数据
维普
