滩涂盐碱土一维渗透淋滤试验与排盐效果分析

One-dimensional Leaching and Seepage Test and Desalinization Effect in Mudflat Saline Soil

通过自行设计一维圆柱形淋滤渗流柱,采用原位回填的方法装填盐碱土样,在人为设定降雨、淋滤的条件下,通过盐分传感器监测研究了滩涂土壤排盐过程中水盐运移特征、时空变化规律和排盐效果,并分析了土壤渗滤液离子成分,研究了土壤水化学成分的变化特征。试验前、后土壤残余易溶盐总量监测结果表明:试验40d土壤排盐率达到65%,持续进行,试验120d土壤排盐率超过90%,且以氯化物为主,其中浅层土壤排盐效果尤为明显,这说明暗管改碱技术对取样区盐碱土改良在技术上和时间上均是可行的。

This paper designs a one-dimensional column apparatus and, through the backfilling of saline soil samples from the coastal area in Rudong County,Jiangsu Province, studies the temporal and spatial migration characteristics of the moisture and solute in the soil by salt sensors under the conditions of artificial rainfall and leaching. The paper also measures the ion composition of the leachate and analyzes the variation of chemical composition in the soil. The results suggest that the removal rate of salt within the first 40 days is 65o/oo and it exceeds 90o/oo 120 days later; the main component removed from the saline soil is chloride and the desalinization effect is especially good in the shallow layer. The study implies that the subsurface pipe drainage system is applicable in the study area for the purpose of desalinization in terms of technique and time.