秸秆阻隔层及碱蓬对赤泥剖面水盐阻控机制研究OA

To study the synergistic mechanisms by which straw barrier layers and Suaeda salsa vegetation control water and salt transport in red mud profiles,indoor soil column experiments combined with HYDRUS-1d numerical simulations were conducted.Straw barriers were installed and Suaeda salsa was planted;model parameters were optimized by fitting measured and simulated values of moisture content and electrical conductivity(EC).The effects of straw barriers and salt-tolerant plants on moisture content,salt content,hydraulic conductivity,and water flux in the red mud profile were analyzed to elucidate the mechanisms governing water and salt transport control during the ecological restoration of red mud stockpiles.The results showed that the model parameters were well-calibrated using measured moisture content and EC values,and the model was validated with good overall accuracy.The straw barrier layer maintained the surface moisture content of the red mud at approximately 22%and stabilized the electrical conductivity at around 1000 μS/cm.Furthermore,planting Suaeda salsa further reduced the surface EC values of the red mud.The synergistic interaction between the straw barrier layer and Suaeda salsa vegetation effectively regulated water-salt transport in the red mud and significantly promoted the ecological restoration of red mud stockpiles.