【摘要】 为了探索频域反射法(FDR)更加准确和稳定的标定方法,以Diviner2000为研究对象,通过改变参数,建立质量含水率与仪器测定电容率计数值之间的函数关系,并与仪器的常规标定方法进行对比。结果表明,根据参数设定法和常规标定法,不同土层回归方程的R~2为0.792～0.851和0.721～0.893,参数设定法满足准确性、稳定性的标定原则。与烘干法相比,参数设定法各土层测定值的差异为6.07%、7.42%、2.62%、2.95%、2.89%,小于测量允许误差(10%)。参数设定法是准确、稳定的标定方法。更多还原

【Abstract】 In order to explore the more accurate and more stable calibration method of FDR-soil moisture measuring instrument,the functional relationship was established between gravimetric water content and instrument-measured numerical value of permittivity by changing parameters with Diviner 2000 as the object,which was compared with the conventional calibration method.The results indicated that R~2 of the regression equation by the method of parameter setting changed from 0.792 to 0.851 while it changed from 0.721 to 0.893 using the conventional calibration method,which indicated that the method of parameter setting could meet the accurate and stable demands.Compared with the oven drying method,the relative errors of measured soil moisture by the parameter setting method were 6.07%,7.42%,2.62%,2.95% and 2.89%,which were less than the admissible error of 10%.Therefore,the method of parameter setting is an accurate and stable calibration method.更多还原