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Study of the water transportation characteristics of marsh saline soil in the Yellow River Delta

机译:黄河三角洲沼泽盐渍土的水分运移特性研究。

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摘要

One-dimensional soil column water infiltration and capillary adsorption water tests were conducted in the laboratory to study the water transportation characteristics of marsh saline soil in the Yellow River Delta, providing a theoretical basis for the improvement, utilization and conservation of marsh saline soil. The results indicated the following: (1) For soils with different vegetation covers, the cumulative infiltration capacity increased with the depth of the soil layers. The initial infiltration rate of soils covered by Suaeda and Tamarix chinensis increased with depth of the soil layers, but that of bare soil decreased with soil depth. (2) The initial rate of capillary rise of soils with different vegetation covers showed an increasing trend from the surface toward the deeper layers, but this pattern with respect to soil depth was relatively weak. (3) The initial rates of capillary rise were lower than the initial infiltration rates, but infiltration rate decreased more rapidly than capillary water adsorption rate. (4) The two-parameter Kostiakov model can very well-simulate the changes in the infiltration and capillary rise rates of wetland saline soil. The model simulated the capillary rise rate better than it simulated the infiltration rate. (5) There were strong linear relationships between accumulative infiltration capacity, wetting front, accumulative capillary adsorbed water volume and capillary height. (C) 2016 Elsevier B.V. All rights reserved.
机译:在实验室进行了一维土壤柱渗水和毛细管吸附水试验,研究了黄河三角洲沼泽盐渍土的水分运移特性,为改善,利用和保护沼泽盐渍土提供了理论依据。结果表明:(1)对于不同植被覆盖的土壤,其累积入渗量随土层深度的增加而增加。 Suaeda和Tamarix chinensis覆盖的土壤的初始入渗率随土壤层深度的增加而增加,而裸土的初始入渗率随土壤深度的增加而减小。 (2)不同植被覆盖的土壤的毛细上升初始速率从表层向较深层呈增加趋势,但这种相对于土壤深度的模式相对较弱。 (3)毛细血管上升的初始速率低于初始渗透速率,但渗透速率的下降速度比毛细管吸水速率更快。 (4)两参数Kostiakov模型可以很好地模拟湿地盐渍土的入渗和毛细上升速率的变化。该模型比模拟渗透率更好地模拟了毛细管上升速率。 (5)累积入渗量,湿润锋,累积毛细管吸附水量与毛细管高度之间存在很强的线性关系。 (C)2016 Elsevier B.V.保留所有权利。

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