FDR-土壤水分测定仪标定方法初探  

Calibration Method of FDR-Soil Moisture Measuring Instrument

作　　者：罗迪汉 宇宙 王勇[1] 李兴[1] 

机构地区：[1]内蒙古师范大学内蒙古节水农业工程研究中心,内蒙古呼和浩特010022

出　　处：《内蒙古林业科技》2015年第1期31-35,共5页Journal of Inner Mongolia Forestry Science and Technology

基　　金：内蒙古新增四个千万亩节水灌溉工程科技支撑项目(20121036)资助

摘　　要：频域反射法(FDR)是目前国内使用较普遍的土壤水分测定方法。为了探索该类仪器在实际测量中更加准确和稳定的标定方法,以Diviner 2000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,代替仪器推荐的体积含水率与电容率计数值之间的函数关系使得仪器的测定结果变为质量含水率(参数设定法);并与仪器的常规标定方法进行对比。通过实际测量,参数设定法不同深度土壤回归方程的R2值区间[0.792,0.851],小于常规标定方法[0.721,0.893]。与烘干法比较,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,小于测量的允许误差(10%)。参数设定法是准确、稳定的标定方法。At present,Frequency Domain Reflectometry（ FDR） soil moisture meter is the commonly adopted instrument of soil moisture monitoring in domestic. In order to explore the more accurate and stable calibration method for this kind of instrument in actual measurement,the author,taking Diviner 2000 as the object of study,establishes the functional relationship between gravimetric water content and instrument-measured numerical value of permittivity by changing parameters. The replacement of the functional relationship between the volumetric water content recommended by the instrument and the numerical value of permittivity makes the results measured by the instrument turn out to be the gravimetric water content（ method of parameter setting）. The author makes a comparison between the method of parameter setting and the conventional calibration method of the instrument. By means of actual measurement,the interval of R2 of the regression equation for different soil layers within the method of parameter setting is [0. 792,0. 851],less than R2 of [0. 721,0. 893]of the conventional calibration method. Compared with the oven drying method,the discrepancies of measured value in each soil layer within the method of parameter setting are 6. 07,7. 42,2. 62,2. 95 and 2. 89,less than the admissible error of 10%. Therefore,the method of parameter setting is an accurate and stable calibration method.

关 键 词：FDR 土壤水分测定 参数设定法 常规方法 回归分析 

分 类 号：S157.2[农业科学—土壤学]