SOIL HYDRAULIC CONDUCTIVITY DATA (FIFE)

The Soil Hydraulic Conductivity Data Set contains soil hydraulic conductivity, matric flux potential, and soil depth data collected during the 1989 FIFE soil properties investigation. The purpose of the 1989 FIFE soil properties investigation was to obtain more points on the soil moisture release curves for the soils at the FIFE stations, and provide values for the saturated hydraulic conductivity for the long-term water balance studies. In-situ measurements of field-saturated hydraulic conductivity were made using the constant well head permeameter method. These measurements were made at five sites, each representing a different soil series. The constant well head method for hydraulic conductivity involves augering a hole to the desired depth and measuring the steady state flow rate of water into the hole while maintaining a constant head of water inside the hole. Six measurements were made at each of the two soil depths at each site. The hydraulic conductivity measurements were made at the same depths and close to (less than 1 m away from) the location where samples for moisture release measurements were taken.

土壤导水率数据集（Soil Hydraulic Conductivity Data Set）收录了1989年FIFE土壤属性调查中采集的土壤导水率、基质通量势（matric flux potential）与土壤深度数据。1989年FIFE土壤属性调查的目标为，获取FIFE站点土壤水分释放曲线的更多测点，并为长期水量平衡研究提供饱和导水率数值。本次研究采用定水头渗透仪法（constant well head permeameter method）开展田间原位饱和导水率测定，共设置5个采样点，每个采样点代表一种不同的土系。该定水头渗透仪法的具体操作流程为：钻孔至目标深度，维持孔内水位恒定，同时测定水流注入孔内的稳态速率。在每个采样点的两个目标土壤深度处，每个深度均开展6次测定。土壤导水率的测定位置与水分释放曲线样品的采集位置处于相同深度，且两者间距小于1米。