【摘要】 TDR(Time Domain Reflectory)——时域反射仪是一种用于测量土壤水分的仪器 ,这是一种利用电磁脉冲方法 ,根据电磁波在介质中传播速度来测试介质的介电常数从而测定土壤水分的仪器。本文介绍了一套 TDR系统的组成和测量方法 ,并对测量结果进行了室内和野外校正 ,结果表明 ,野外校正比较符合实际情况 ,可以作为黄土高原地区进行 TDR校正的参考。由于具有快速、准确等优点 ,能自动、连续地监测土壤含水量 ,TDR是一种值得推广的土壤水分测定仪器更多还原

【Abstract】 TDR (Time Domain Reflectory) is a type of equipment for measurement of soil water content. The travel velocity of electromagnetic wave is determined by the dielectric constant, and the dielectric constant of soil is determined by the soil water content. TDR can measure the soil water content by measure the travel velocity of electromagnetic wave. A set of TDR system and its measurement are introduced. Calibration for TDR measurement was done in the laboratory and the field. The result shows that the calibration has to be done and the field calibration is practicable, and the prediction equation can be used in other area of the Loess Plateau. Because TDR can measure soil water content automatically and continuously, this method is recommendable.更多还原