GQZ—Z1型称重式蒸渗计的研制及标定

在土壤水分蒸散量测量仪器研制中，首次在蒸渗计的原状土柱与反滤层接触部分安装了自动补（抽）水设备，使土桶内原状土柱与大田内的土壤水分保持一致。提出了传感器的参数选用原则和蒸渗计标定方法。经过安装和标定使用，GQZ—Z1蒸渗计的精度达到设计和观测0．1mm的要求，能够有效提高农田蒸散量的观测精度，其测定值能很好地反映植物在短时段内的蒸散变化。

Development and Calibration of the GQZ - Z1 Type Weighing Lysimeter

For the first time, a water pump system was incorporated in the place between the undisturbed soil column and the inverted filter in the weighing lysimeter, which is used to balance the moisture between the undisturbed soil in the soil bucket and the fields. Al- so, the principles for the parameters selection of the sensors and the methods for the calibration of lysimeter were proposed in the pa- per. It was found that the modified weighing lysimeter, namely GQZ -Z1, satisfied the 0.1 mm of design and observation precision re- quirement. Higher accuracy in the measurement of evapotranspiration in farmland can be reached by the new GQZ - Z1 lysimeter. The measured value effectively reflected the evapotranspiration variation of the plant within a short period.