Three-pole Debye model parameters of soil dielectric permittivity spectra

The dataset contains fitted three-pole Debye dielectric model parameters of 567 soil spectra. Three soils of loamy sand, sandy loam, and silt loam textures were tested. Of each soil, 20 samples of various water contents were prepared with the use of distilled water and potassium chloride solutions, 5 samples for each liquid. Air-dry samples were also prepared. Dielectric spectra were obtained with the use of a six-channel coaxial-transmission-line cell system at 9 controlled temperature steps from 0.5 to 40°C in the 0.02 – 3 GHz frequency range.To each obtained spectrum, the three-pole Debye model with an added DC electrical conductivity term was fitted with the use of a procedure utilizing the Levenberg-Marquardt nonlinear least squares algorithm. The dataset contains model parameters with their standard errors and RMSE. Parameters of the samples: volumetric water content, temperature, electrical conductivity of the solutions, soil textures, and the formula for the dielectric model were included in the dataset file.

该数据集汇集了567个土壤光谱的适配三极Debye介电模型参数。其中，对沙壤土、沙质壤土和粉砂壤土三种土壤质地进行了测试。对于每种土壤，制备了20个不同含水量的样本，使用蒸馏水和氯化钾溶液进行制备，每种液体5个样本。同时，也制备了空气干燥样本。通过六通道同轴传输线细胞系统，在0.02至3 GHz的频率范围内，以0.5至40°C的9个控制温度步骤获取了介电光谱。对于每个获取的光谱，采用Levenberg-Marquardt非线性最小二乘算法的拟合过程，将包含直流电导率项的三极Debye模型进行了适配。数据集中包含了模型参数及其标准误差和均方根误差。样本参数包括体积含水量、温度、溶液的电导率、土壤质地以及介电模型的公式，这些信息均包含在数据集文件中。