测量土壤水分特征曲线的复合传感器设

为了直接获取土壤水特征曲线,在一种商品化微型张力计的基础上,设计了一种同步测量土壤水吸力与容积含水率的复合传感器.将张力计中的一段金属保护套管作为天线,利用其辐射阻抗随着土壤含水率变化的规律来测量土壤容积含水率.在实验室环境下,利用3种不同质地土样(砂土、砂壤土、粘壤土)对复合传感器进行了试验,并与经典土壤水特征曲线测量方法(压力锅法结合砂箱法)获得的数据进行了比较.结果表明,复合传感器在3种土壤样品上获得的水分特征曲线的均方根误差均小于0.05,与标准方法所获得的结果具有较好的一致性.

of Dual-sensor for Measuring Soil Water Characteristic Curve

Based on a commercialized tensiometer,a dual-sensor was presented that it was able to simultaneously determine soil matric suction and volumetric water content,and therefore obtain soil water characteristic curve(SWCC) directly.Soil volumetric water content was measured by employing the metallic tube of the tensiometer as an antenna,whose radiating impedance varied as soil water content.Soil samples of three texture classes(sand,sandy-loam,and clay-loam) were tested and compared with the data from the sand ...