Simulation of Salt Transport in Saline-alkali Soil under Different Control Modes

Abstract

 In order to ascertain the difference in the improvement effects of the two modes of water storage and drainage on saline-alkali soil. The method of simulating test plots was adopted to establish a closed water storage test area and an opened drainage test area. The interannual dynamic characteristics of soil salinity at different levels are analyzed. [Results] Under the water storage mode and drainage mode, the salt content of 0-100 cm soil was in a downward leaching migration state. Under the water storage mode and drainage mode, the soil salinity of each layer showed a trend of first decreasing and then increasing from 2015 to 2019. The horizontal migration of soil salinity in the water storage mode is mainly the interannual circular migration from the far end of the pool to the end of the near pool and then to the end of the far pool. The horizontal movement of soil salt in drainage mode is mainly one-way movement from the far end of the pool to the near end of the pool.