centrifugal method

Relationship among weight content,suction and bulk density was measured by using centrifugal method for six types of soils ranging from sand to silt clay loam.

利用离心机法测定了黄土高原6种典型质地土壤的吸力、容重和重量含水量三者的关系,分析了土壤持水特征测定中的容重变化特征;借用土壤水分特征曲线幂函数模型和土壤收缩特征线性模型获得容重与吸力间幂函数关系,并利用试验资料进行检验;提出了确定土壤持水特征测定中容重变化的三点法,该方法所获得土壤水分特征曲线与实测结果极为吻合,精度较高。

The soil water characteristic curves for 3 soil strata(0～20?cm,20～40?cm and 40～60?cm) of Dongyang town of Qixia district of Nanjing City were measured by use of the centrifugal method.

采用离心机法测定了南京市栖霞区东阳镇0~20 cm,20~40 cm,40~60 cm 3层土壤的水分特征曲线(SWCC),分析了密度变化对吸力的影响、质量含水量与时间的关系、土壤吸力与质量含水量的关系;根据分析结果改进了传统的吸力求解公式,得出了离心机法测定粉砂壤土水分特征曲线时的最佳离心时间。