在天津经济技术开发区 ,依据“允许深度”建立“浅密式”排盐设施并配以相应的管理后 ,连续 10a的观测数据表明 :土壤盐分的空间分布符合正态分布 ;1m土体内不同土层的含盐量及 1m土体的总含盐量随治理时间的延长按照指数规律平稳地减少 ,盐分的表聚性逐渐减弱 ,土壤盐分的空间变异性变小 ;同时 ,土壤盐分的主组成分由NaCl向Na2 SO4 转变 .土壤盐分的演变规律表明 :通过“浅密式”排盐系统 ,可在不到 5a的时间内 ,便在 97.5 %置信度的保证下 ,将开发区土壤的含盐量控制在 0 .2 %以下 ,基本上解除了土壤盐分对园林植物的危害 In Tianjin Economic and Technological Development Zone, according to “allowable depth” to establish “shallow” salt drainage facilities and corresponding management, the observation data of successive 10 years show that: the spatial distribution of soil salt is in accordance with the normal distribution; within 1m soil Soil salt content and total salt content of 1m soil decreased steadily according to the exponential law with the extension of treatment time, and the surface aggregation of salt decreased gradually, and the spatial variability of soil salinity became smaller. At the same time, The change of composition from NaCl to Na2 SO4 shows that the evolution of soil salinity shows that the “shallow-density” salt drainage system can be used in a period of less than 5 years with the assurance of 97.5% confidence. Salinity control at 0.2% or less, basically lifted the soil salinity harmful to garden plants