通过棉花桶栽试验,获取棉花全生育期土壤蒸发蒸腾量以及土壤含水率、含盐量变化规律.以土壤水分运动基本方程和溶质运移对流-弥散方程为基础,在考虑棉花根系吸水和土壤蒸发蒸腾条件下,对膜下滴灌棉花全生育期时段内土壤中水盐运移规律进行了数值模拟,并与实测的土壤含水率和含盐量进行了对比分析.其结果显示:土壤表层和深层的土壤含水率和含盐量模拟值与实测值均存在不同程度的偏差,而中间层土壤含水率和含盐量的模拟值较接近实测值.因此,只要能够获得足够的精确的大田实测资料,就可以将该模型应用于棉花膜下滴灌土壤水盐运移规律的实际预测.%This study determined the changes of soil evapotraspiralion, water content and soil salt through the growth stage of cotton planted in plastic barrel. Based on the equations of soil water movement and convection-dispersion of solute transport, HYDRUS-2D software was used to simulate the rules of soil water and salt transports on condition taking into account cotton root water uptake and soil evapotraspiration, the simulated and measured values were compared of soil moistures and salt contents. The results showed that the simulated and measured values of soil moistures and salt contents were different both in the surface and deep layers, but were close in the middle layer. Thus, HYDRUS-2D software can be used to forecast soil water and salt transports under mulch drip irrigation when sufficient observed data are obtained in cotton field.
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