Effects of straw layer and brackish water irrigation on water-salt distribution and pore structure properties of coastal saline soil

Objective To enhance salinity leaching efficiency and prevent soil resalinization under brackish water irrigation. Method this study investigated the combined effects of straw layer applications and water mineralization levels on soil water-salt distribution through controlled soil column experiments.Three straw layer application rates 0 t（0SL），0.75 t（LSL），and 1.50 t（HSL）per 667 m2 were established in combination with two brackish water treatments［3 g/L（LBW）and 5 g/L（HBW）］.CT nondestructive scanning technology was employed to analyze soil pore structure characteristics. Result （1）Brackish water irrigation effectively reduced soil electrical conductivity（EC）in the 0-Conclusion In conclusion，the application of straw layers in conjunction with brackish water irrigation significantly enhances the efficiency of salinity leaching and mitigates the resalting of surface soil.This improvement is primarily attributed to the capacity of straw layers to enhance the soil’s pore structure and decrease water evaporation from deeper soil layers.This study serves as a valuable reference for the comprehensive improvement and utilization of coastal saline soils，addressing the scarcity of agricultural freshwater resources and promoting sustainable agricultural development.