基于HYDRUS-2D膜下滴灌玉米生育期水盐运移关键影响因子识别OA

A systematic study was conducted on soil water and salt transport patterns under mulched drip irrigation conditions in the Hetao Irrigation District,focusing on the interactive mechanisms and underlying causes of groundwater depth,soil texture,and initial profile salinity distribution on water and salt migration processes.Taking the Hetao Irrigation District in Inner Mongolia as the study area,this research systematically simulated and analyzed the effects of mulched drip irrigation on soil water-salt transport under various soil textures(silty loam,sandy loam,silty upper layer over sandy lower layer,and sandy upper layer over silty lower layer)and multiple interactions of initial salinity conditions and groundwater depths.Results indicate that soil profile texture,particularly the texture of the upper soil layer,plays a dominant role in surface salinity accumulation.Salinity accumulation capacity:silty loam>silty upper layer over sandy lower layer>sandy upper layer over silty lower layer>sandy loam.Therefore,priority should be given to controlling areas with high surface soil salinization potential.To ensure that surface soil salinity under and above the drip irrigation film does not exceed moderate salinization by the end of the growing season,while considering ecological requirements,loamy soils and sandy loam soils should maintain groundwater levels at 3 m.Additionally,initial soil salinity should be kept at low levels(Type C:0-1 m initial salinity 1.33 g/kg,1~4 m initial salinity 4 g/kg),while increasing film width.Sandy loam and loamy sand soils require maintaining groundwater at 1.5 m depth,with higher permissible initial salinity values(Type D:0~1 m initial salinity 1.33 g/kg,1~4 m initial salinity 6 g/kg).