大安市苏打碱土区地下水质与灌溉盐渍化风险评价

Quality of Groundwater in Sodic Soil Areas in Da′an City and Soil Salinization Risk of Using the Water for Irrigation

摘要: 测试了吉林省大安市苏打碱土区6—7、20—30和60—70 m 3种深度地下水的基本化学特征,对利用地下水灌溉可能引起的土壤盐化、碱化和盐碱化问题及其灌溉适宜性进行了评价。结果表明,各深度地下水均具有不同程度的苏打化特征,地下水中普遍含有较多NaHCO₃;30 m深度以内地下水中含有较多HCO₃^-和C l^- ,用其作为灌溉水源存在潜在的盐化和碱化双重威胁;从各盐化和碱化指标看,该区60 m深度以下的地下水质较好,作为灌溉用水不会产生盐渍化风险。30 m深度以内的地下水均不适合灌溉。

Abstract: Chemical properties of groundwaters（6-7,20-30,60-70 m in depths） at sodic soil areas in Da′an City,Jilin Province were measured and soil salinization risk of using the groundwaters for irrigation was analyzed.The results show that 1)Groundwater,regardless of depth,takes on the characteristic of being soda-affected to a varying extent with NaHCO₃ to be the dominant salt in the groundwater.2)The groundwater within the depth of 0-30 m is quite high in HCO^-₃ and C l^-.This kind of groundwater can not be used for irrigation,or else soil salinization and alkalization would occur.3)The groundwater below 60 m in depth is good in quality and can be used for irrigation without the risk of soil salinization.