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疏勒河灌区盐渍土面积大,分布范围广,已成为导致流域土地荒漠化的重要原因之一,通过建立垂直洗盐条件下的土壤水盐运移模型,运用数值模拟方法对疏勒河灌区垂直洗盐制度进行了研究,结果表明:第一次冲洗结束后72 h、随后几次冲洗间隔60 h能最大程度的溶解土壤盐分并有效防止表层返盐,取得最佳的脱盐效果;第一次冲洗水量控制在土壤饱和含水率以内,随后几次冲洗水量适当增加的处理TYS3可使脱盐率达91.3%;不同的冲洗定额,处理TYD3比TYD4每方水多脱盐0.0025%,说明冲洗水量太多对脱盐贡献率反而较小。通过以上模拟结果建立了灌区不同初始含盐量情况下的垂直洗盐制度。
The large area and wide distribution of saline soil in the Shule Irrigation Area have become one of the important reasons leading to the desertification of the watershed. Through establishing the model of soil water and salt transport under the condition of vertical salt washing, Vertical salt washing system was studied. The results showed that: 72 h after the first rinse, the next several rinsing intervals of 60 h can dissolve the soil salinity to the maximum extent and prevent the salt return on the surface and achieve the best desalination effect. The first The amount of flushing water is controlled within the saturation moisture content of the soil, followed by several times the appropriate increase in the amount of flushing water treatment TYS3 desalination rate can reach 91.3%; different flushing quota, TYD3 than TYD4 water demineralization 0.0025% More on the desalination contribution rate is smaller. Through the above simulation results, the vertical salt washing system under different initial salinities of irrigation area was established.