基于热平衡法检测植物茎流传感器的标定

A calibration method for stem-flow sensor based on heat balance

植物茎杆的茎流量是植物重要的生理信息之一,该文主要是对基于热平衡法的植物茎流传感器进行标定试验的研究,通过标定试验,测试了茎流检测装置的性能。试验结果表明,计算出传感器输出值与茎流量有很高的决定系数R2=0.96～0.97,分辨率为1×10-3g/min,精度为±3%。因此参照标定试验,可以较准确地获取植株茎流速率,进而可以反映出植物的蒸腾及需水状态信息,并据此可以为植物生长环境的调控、节水灌溉等提供有效的监测工具。

The stem-flow of plant is one of the important plant physiological indices.In this paper,a calibration method for heat balance stem-flow sensor was proposed.According to the calibration experiment,the performance of stem-flow detection device was tested.The results showed that the value of sensor output was significantly correlated to stem-flow,(R2=0.96~0.97) with the resolution of 0.001 g/min and the precision of ±3%.Therefore,referring to the calibration experiment,the rate of stem-flow of plant can be accurately obtained,which can reflect the transpiration rate of plant and the information of moisture.It can provide an effective monitoring tool for the growth environment of plant and water-efficient irrigation.