Investigation of salinity accumulating and its movement characters in original saline wasteland

Based on the tracking and monitoring data of the salinity in original saline wasteland in north China during two years, the salinity accumulation and its movement characters under natural conditions in original saline wasteland were investigated. The experimental results showed that the amount of topsoil salinity accumulating under natural conditions in original saline wasteland is limited. The soil salinity accumulating and moving of unsaturated belt beneath the surface can be separated into three regions, the severe change region, the storage adjustment region and saline conducting region. The salt content in the severe change region fluctuates acutely because of rainfall and evaporation, the water and salt waved in the upper and lower layer are stored and adjusted in the storage adjustment region, and the salinity can hardly be accumulated in layer but keeps stably in the saline conducting region owing to great hydraulic conductivity.