Abstract:

Considering the fact that there were the coastal saline-alkali soil characteristics of shallow groundwater levels,spring and autumn easy to back salt intensely,micro-area required to change soil and lay across sand layer separated salt for landscaping.The impacts of sand porticle distribution of sand-layered soil and groundwater depth on water and salt migration characteristics were analyzed through the indoor soil columns experiment.The results show that the sand inclusion level of the water and salt inhibition rate was stone glass> small sand > liquid slag at the same ground water phase,namely, the migration rates of water and salt were intensified for the treatments with the worse sand distribution;when the sand-level distribution was consistent, the inhibition rates of water and salt in the groundwater table of 110cm were higher than the groundwater level of 80cm’s. The sand on the inhibition rate of water reduced with the evaporation lasted extension,however, the sand on the salt rejection increased with the extension of duration increased evaporation;after 30d’s evaporation,the effect of the sand layer against salt transport was more than the effect against water transport at the same evaporation duration. The study had provided a reference for coastal saline-alkali soil’s improvement as well as irrigation and draining water formulations.