咸-淡水交替漫灌淋洗改良滨海盐土效果

Effects of Leaching by Alternate Flooding with Salty and Fresh Water on Coastal Saline Soil

为探讨咸-淡水交替漫灌淋洗改良滨海盐土效果,通过土柱模拟试验对咸-淡水交替漫灌淋洗与淡水漫灌淋洗(对照)条件下土壤溶液电导率变化、淋出液矿化度变化、淋洗用水量等进行了研究。结果表明:咸-淡水交替漫灌淋洗模式咸水(矿化度5.35 g/L)淋洗阶段土壤溶液电导率和淋出液矿化度变化规律与对照淡水漫灌淋洗基本一致;咸-淡水交替漫灌淋洗模式淡水淋洗阶段,前期不同深度土壤溶液电导率基本保持稳定,之后由表层往下土壤溶液电导率先后经过快速下降和缓慢下降两个过程;与对照比较,咸-淡水交替漫灌淋洗淡水节约率为25.38%。咸-淡水交替漫灌淋洗模式改良滨海盐土效果较好,且节水潜力较高,但相应需要更长的淋洗改良时间。

To investigate the effect of alternate flooding with salty and fresh water on improvement of coastal saline soil,a soil column simulation experiment was carried out to study the change of solution electrical conductivity,degree of mineralization and water consumption.The results showed that at the stage of flooding with salty water in treatment S-W,the changes of soil solution conductivity and total dissolved solid of effluent were similar to those in treatment CK.At the followed stage of flooding with fresh water in treatment S-W,the soil solution conductivity in different depths remained stable at the beginning,and then decreased rapidly and finally decreased slowly.Compared with the treatment of CK,the water saving rate of treatment S-W was 25.38%.Leaching by alternate flooding with salty and fresh water could improve the coastal saline soil and its potential of water saving is obvious,but the cost of time is more.