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首页> 外文期刊>Spanish Journal of Agricultural Research >Unsaturated hydraulic conductivity of disturbed and undisturbed loam soil
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Unsaturated hydraulic conductivity of disturbed and undisturbed loam soil

机译：扰动和不受干扰的壤土的不饱和导水率

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摘要

The soil water content-pressure head curve (theta(h)), described by van Genuchten, was used to predict some hydraulic characteristics of a Xeric torriorthent soil. Experimental data of volumetric soil water content (theta) and pressure head (h) were adjusted to the model, obtaining the three independent parameters used to calculate the unsaturated soil hydraulic conductivity (K) and soil water diffusivity (D). The K(theta) functions for disturbed and undisturbed soil samples were statistically different pointing to the effect of soil structure on soil water flow. For soil moisture values close to saturation, K values were >/= 0.392 and >/= 0.019 cm hE?1, for undisturbed and disturbed soils, respectively. These low values would reflect the loam texture of the soil studied. In absence of roots capable of absorbing water, a supply of more than 4 L mE?2 hE?1 will lead to water-logging and losses through evaporation and runoff.
机译：van Genuchten描述的土壤含水量-压力头曲线（theta（h））被用来预测干旱土壤的一些水力特性。调整土壤体积水含量（θ）和压头（h）的实验数据，获得用于计算非饱和土壤导水率（K）和土壤水分扩散率（D）的三个独立参数。扰动和未扰动的土壤样品的K（θ）函数在统计上是不同的，表明土壤结构对土壤水流的影响。对于接近饱和的土壤水分值，对于未扰动和扰动的土壤，K值分别为> / = 0.392和> / = 0.019 cm hE？1。这些低值将反映所研究土壤的壤土质地。如果没有能吸收水分的根，供应量超过4 L mE？2 hE？1会导致水淹和蒸发和径流损失。

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