盐碱地地下水不同利用年限的土壤水盐动态变化

Dynamic Changes of Soil Water and Salt in Saline Alkali Land with Different Utilization Years of Groundwater

为缓解目前宁夏灌区内用水紧张局面,开展了区域地下水利用对土壤地下水埋深、水质、土壤剖面盐分的影响研究,了解银北灌区地下水利用下的水盐运移规律和水土环境效应。结果表明,示范区由于利用地下水,采用节水灌溉,施用土壤调理剂、水溶肥等,减少了灌水、化肥等用量,地下水埋深、地下水矿化度、地下水pH、土壤盐分明显降低,极大缓解了由于地下水位高导致的土壤次生盐渍化,改良了盐碱地,提高了盐碱地蔬菜种植效益。

In order to alleviate the current water shortage situation in Ningxia irrigation areas,the effects of regional groundwater utilization on soil groundwater depth,water quality and soil profile salinity were studied,in order to timely understand the water and salt transport law and water and soil environmental effects under the utilization of groundwater in Yinbei irrigation area.The results showed that due to the use of groundwater,water-saving irrigation,soil conditioner and water-soluble fertilizer,the amount of irrigation and chemical fertilizer were reduced,the groundwater depth,groundwater mineralization degree,groundwater pH and soil salt were significantly reduced,the secondary salinization of soil caused by high groundwater level was greatly alleviated,the saline alkali land was improved,and the vegetable planting benefit in saline alkali land was improved.