基于相位差的时域反射仪测定土壤含水量的标定和田间验证  

Calibration and field verification of TDR based on phase difference for measuring soil water content

作　　者：郑茹梅[1] 李子忠[1] 龚元石[1] 王一鸣[2] 杨新明[1] 王克栋[2] 

机构地区：[1]中国农业大学资源与环境学院,北京100193 [2]中国农业大学信息与电气工程学院,北京100083

出　　处：《中国农业大学学报》2011年第1期100-104,共5页Journal of China Agricultural University

基　　金：国家"863"计划项目(2006AA10Z264)

摘　　要：为了检验具有我国自主知识产权的基于相位差检测原理的时域反射仪(TDR)测定土壤水分的性能,利用室内土柱试验,获得了该仪器测定土壤含水量的标定曲线,分析了影响因素,并在田间对标定曲线进行了实际验证。结果表明,容重对仪器测定土壤含水量的影响不显著;土壤质地对校正结果有明显影响,供试的砂质土类,壤质黏土类和黏土类分别可以使用一个特定标定公式,R2均大于0.98,估计标准误差均小于0.020cm3/cm3;该仪器用于田间测定含水量的均方根误差小于0.035cm3/cm3。因此,经过室内标定后,将新型时域反射仪用于测定田间土壤含水量是可靠的。The objective of this study is to test the performance of time domain reflectometry（TDR） based on phase difference detecting with independent intellectual property rights measuring soil water content.A laboratory calibration experiment using soil column was conducted to obtain the calibration equations for TDR measuring soil water content,and field test was also conducted to validate these calibration equations.The results showed that,there was no significant effect of bulk density on the calibration relationship between time measured by TDR and soil water content,but the soil texture had a significant effect.It could be calibrated using three calibration formulas in sandy soil,loamy clay soil and clay soil,respectively.All of R2 were greater than 0.98,and the estimated standard errors were less than 0.020 cm3/cm3.The root mean square errors were less than 0.035 cm3/cm3 for TDR measuring soil water content in the field.Therefore,this new TDR instrument was reliable to measure soil water content in the field using calibration equations from the laboratory experiments.

关 键 词：土壤含水量 时域反射 相位差 

分 类 号：S151.9[农业科学—土壤学]