新型FDR土壤水盐一体传感器标定研究与应用

发布时间：2018-05-28 07:20

本文选题：频域反射(FDR) + 土壤水盐　；参考：《中国土壤与肥料》2016年06期

【摘要】：运用新型频域反射(FDR)技术和分频技术,实现传感器水盐同时测量。因土壤质地、容重等差异,土壤水盐标定是利用FDR监测土壤水盐过程中的必要环节。以东北壤土为试验对象,利用"由湿到干,由小到大"的土壤水盐运动规律,通过土柱试验,用烘干法和土壤溶液电导率法对FDR进行室内标定研究。同时,将时域反射(TDR)式水盐传感器作为对照系,进行稳定性、精准度比较。结果表明:1)经土壤水分标定曲线校正后,FDR式水盐一体传感器具有很高的测量精度,可达±1%~3%;2)在土壤里对同一水盐含量进行百次重复测定,TDR传感器水分平均值为20.07%,相对标准偏差为0.18%;盐分(电导率)平均值为0.29 m S/cm,相对标准偏差为11.06%;新型FDR传感器水分平均值为20.08%,相对标准差为0.21%;盐分(电导率)平均值为0.31m S/cm,相对标准差为8.49%。新型FDR土壤水盐一体传感器可用于农田土壤连续水盐监测,提供稳定、精确的基础数据,结合数据分析软件,指导种植生产。
[Abstract]:The new frequency domain reflection FDR (FDR) technique and the frequency division technique are used to realize the simultaneous measurement of water and salt in the sensor. Because of the difference of soil texture and bulk density, the calibration of soil water and salt is necessary in the process of monitoring soil water and salt by FDR. Taking the northeast loam soil as the experimental object, the FDR was calibrated in laboratory by using the soil water and salt movement law of "from wet to dry, from small to large" through soil column test, drying method and electric conductivity method of soil solution. At the same time, the time domain reflection TDR-based water salt sensor was used as the control system to compare the stability and accuracy. The results show that the FDR type water-salt sensor has a high measuring accuracy after calibrating the calibration curve of soil moisture. The average water content of TDR sensor is 20.07, the relative standard deviation is 0.18, the average salt (conductivity) is 0.29 Ms / cm, the relative standard deviation is 11.06 cm; the new FDR sensor has a new type of water sensor, the average value is 0.29 m / cm, and the relative standard deviation is 11.06%; the average water content of the sensor is 20.07; the relative standard deviation is 0.18; the average value of salt (conductivity) is 0.29 m / cm; The average value is 20.08, the relative standard deviation is 0.21, the average salt (conductivity) is 0.31m S / cm, the relative standard deviation is 8.49. A new type of FDR soil water-salt sensor can be used for continuous monitoring of soil water and salt in farmland, providing stable and accurate basic data, and combining with data analysis software to guide planting and production.
【作者单位】：北京邮电大学;沈阳巍图农业科技有限公司;天津市土壤肥料工作站;
【基金】：天津市财政专项(2015-2016)“土壤墒情远程自动监测与预警项目” 科技型中小企业技术创新项目(2013-2016)“土壤水分远程监测与精准灌溉系统”(13C26212100963)
【分类号】：TP212;S151.9

【相似文献】