Monitoring of coastal saline soil water and salt transport is of great value on the soil physics and irrigation studies. In this paper, a vertical infiltration experiment was conducted to monitor the vertical variation of resistivity in the leaching process under different water level in an experimental tank by the designed automatic monitoring device. The experimental results showed regardless of whether the groundwater exist, the resistivity peak moved down in the curve of leaching, and the desalination occurred from the top to bottom, the desalination depth remains the same with the same leaching amount. However, the groundwater reduced the speed of water and salt transport and affected the water and salt migration of upper soil due to the capillary force.
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