土质.不饱和液体渗导性和水保持特性的测定.风蒸发法

[中文适用范围]： 本国际标准规定了同时测定土壤不饱和导水率和土壤保水特性的实验室方法。 它仅适用于干燥或解吸曲线的测量。 该方法的应用仅限于尽可能均匀的土壤样品。 该方法不适用于基质水头 hm = 0 cm 至 hm = -800 cm 范围内收缩的土壤。 电导率的测定范围取决于土壤类型。 它位于大约 hm = -50 cm 和 hm = -700 cm 的矩阵水头之间。 保水特性的测定范围位于大约hm = 0 cm 和hm = -800 cm 的基质水头之间。 注 1：渗透计方法可用于确定接近饱和的水力传导率。 注 2：ISO 11274 给出了确定 0 cm 至 -15 000 cm 之间基质水头保水特性的方法。 [外文原描述]： ISO 11275:2004 specifies a laboratory method for the simultaneous determination in soils of the unsaturated hydraulic conductivity and of the soil water-retention characteristic. It is applicable only to measurement of the drying or desorption curve. Application of the method is restricted to soil samples which are, as far as possible, homogeneous. The method is not applicable to soils which shrink in the range of matric head 0 cm to -800 cm. The range of the determination of the conductivity depends on the soil type. It lies between matric heads of approximately -50 cm and -700 cm. The range of the determination of the water-retention characteristic lies between matric heads of approximately 0 cm and -800 cm.