TRIME-T3管式TDR在测量土壤水分时的误差及校正

摘要

TRIME-T3管式TDR (Time domain reflectometry)系统线路简单、能耗小、价格便宜、可实现非扰动定位瞬时剖面观测,广泛用于测量土壤水分.但是,在安装和使用过程中,受土壤空隙、温度、类型、电导率、含水量等因素的影响,测定土壤水分会产生误差.为提高土壤水分数据的准确性,系统总结国内外研究成果和笔者实际操作经验,提出了经验公式、室内校正、野外校正和其他校正等方法.%The TRIME-T3 tubular TDR system was with simple circuits,low energy consumption,cheap cost,and could realize undisturbed positioning instantaneous profile observation,which was widely used in measuring soil moisture.However,data error often occurred due to factors such as soil interstices,soil temperature,soil type,electrical conductivity,soil water content and so on during the process of installation and measurement.In order to obtain soil moisture data more accurately,the error of measurement was reduced as much as possible based on research results indoor and outdoor as well as practical experiences.