半透膜土壤渗析法盐碱地原位淡化实验研究

In-situ Desalination Experiment in Saline Land by the Semi-permeable Soil Dialysis Method

研究提出了一种将盐碱地原土进行淡化、原位植树绿化的新技术方法。该方法是依据半透膜的单向渗透功能实现的,用半透膜管构建成连续供水系统,连续水流携带盐分不停地向远离根区方向单向运移,最后移至根区之外,在湿润锋处富集,变成无盐害。该过程同时使湿润体内部的土壤淡化,使根区附近土壤含盐量降至正常土壤水平,实现原位淡化,局部淡化处可用于种植乔木、灌木或花丛,实现盐碱地绿化。其主要技术特点是淡化后的土体可永不返盐。该方法在解决了盐碱地利用的同时,也完成了节水灌溉。

This experiment was based on a semi-permeable function in one direction and a continuous water supply system was built by semi-permeable tubes. In this system, salt was firstly carried with continuous flow, then migrated away in one direction from the root zone, and finally moved out of the root zone and enriched in the wetting front. As a result, salt damage to soil was prevented. The process made soil desalinated inside the wet zone and soil salinity dropped to normal level near the root zone and realized the in-situ desalination. Partial desalination was used in planting trees, shrubs, or flowers and led to saline land virescence. The main technical characteristics were that salt was never accumulated after desalination. The new method can solve land use problems of saline-alkali soils abd also completed the water-saving irrigation.