In order to investigate the effect of synergistic effect of furrow irrigation and subsurface drainage on water-salt migration in coastal saline soil,Tianjin Binhai New Area was selected as the research area,and field experiments were carried out in typical saline-alkali areas.The experimental data were filtered and verified by HYDRUS simulation effect.By using the verified model,the influence of different furrow irrigation and subsurface drainage on water-salt migration in coastal saline soil was explored.The results showed that soil water-salt migration under the synergistic action of furrow irrigation and subsurface drainage was a comprehensive reflection of furrow irrigation and subsurface drainage.The shallow soil near furrow irrigation was significantly affected by furrow irrigation,and the salt content at furrow depth was low in the soil layer with the same depth,while the salt content at ridge was high.The shallow soil near the subsurface drainage was significantly affected by the drainage of the subsurface drainage,and the closer the soil was to the subsurface drainage,the lower the soil salt content.The increase of ridge distance and depth can improve the leaching depth,and the increase of ridge distance can also improve the leaching range.At the same time,the accumulation of salt on the ridge increases,so the salt on the ridge should be treated in time to prevent a lot of salt from washing down.The research results can provide theoretical support for the improvement and utilization of saline-alkali land.
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