温度对FDR测量土壤体积含水量的影响

Experimental Study of Temperature Effect on FDR Measured Soil Volumetric Water Content

为研究温度对FDR测量土壤体积含水量的影响,采用基于FDR技术的两种土壤水分传感器TDR-3和PR2,在环境温度范围为5～60℃条件下,对南京地区的粘性土土样进行了土壤体积含水量测试分析.结果表明:基于FDR技术的土壤水分传感器测量土壤水分时存在明显的温度效应,两种传感器所测的体积含水量与温度之间均呈线性递增关系,TDR-3的温度修正系数范围为0.2%～0.3%(v/v)·℃-1,PR2的温度修正系数范围为0.1%～0.2%(v/v)·℃-1.研究成果对于提高FDR测量结果的可靠性具有重要意义.

In order to study the temperature effect on FDR measured soil volumetric water content,the soil volumetric water contents of specimens were measured by two soil moisture sensors of FDR（TDR-3and PR2）,under different temperature conditions（5～60℃）.The results show that there is a pronounced temperature effect on the soil moisture sensors during the FDR measuring volumetric soil water content.The relationships between the values measured by soil moisture sensors and temperature are linear.The temperature correction coefficient of TDR-3is 0.2%～0.3%（m3·m-3）·℃-1,and that of TDR-3is 0.1%～0.2%（m3·m-3）·℃-1.The research is useful for improving the reliability of FDR measurement results.