土壤水分时域反射仪(TDR)自制探头的校正与应用

Calibration and Application of Self-Made TDR Probe

根据TDR工作原理制作了TDR探头,并对其进行了室内标定,结果表明,介电常数的平方根(Ka)与体积含水量(,θ%)有良好的线性相关(R2=0.995)。并在田间与中子仪测定结果进行了对比,结果表明,平均绝对偏差为0.17%,平均相对偏差为8.58%,说明TDR自制探头可以在黄土高原地区推广应用。

TDR probe was made according the work principle of TDR and calibrated in the laboratory. The result showed that the relationship between the square root value of dielectric constant of soil and soil water content in volumetric basis can be well described by linear equations of which the correlation coefficient are greater than 0. 995. A comparison of measuring soil water content with self- made TDR probe and neutron probe was made in field. The result showed average absolute error is 0.17% and average relative error is 8.58%. It is concluded that self - made TDR probe can be used in the other area of Loess Plateau.