基于Lora无线技术的多路盆栽植物蒸散测量系统研发

Development of Multi-Channel Potted-Plant Evapotranspiration Measurement System Based on Lora Wireless Technology

目前国内专用于测量盆栽植物蒸散量的设备较少,且均为单点测量,盆栽科学实验中大多借助于商用电子秤。开发了一套基于Lora无线技术的多路盆栽植物蒸散在线测量系统,可以远程在线获取多路盆栽植物重量。称重单元连续15 d在线称重和0~30℃温度变化范围内最大误差不超过1 g,节点采样间隔为5 min可连续工作120 d以上。经温室盆栽生菜实验表明:生菜单日内蒸散速率呈现峰值变化趋势;各个生长阶段蒸散速率的关系为:中期>后期>前期;蒸散速率与太阳辐射量、大气饱和水汽压差的线性相关度分别为0.86,0.78。系统测量结果与现有研究基本一致,可以较好的反映整个生长周期盆栽植物蒸散的变化趋势,为植物蒸散在线多点监测提供高精度、高可靠的智能设备支持。

At present,there are few devices for measuring evapotranspiration of potted plants in China,and all of them are single point measurement,and commercial electronic scales are mostly used in potted science experiments.In this paper,an online measurement system of evapotranspiration of multi-path potted plants based on Lora wireless technology is developed.The maximum error of the weighing unit within the range of 0~30℃temperature and online weighing for 15 consecutive days is no more than 1 g.The node can work continuously for more than 120 days with a sampling interval of 5 minutes.The experiment of potted lettuce in the greenhouse showed that the evapotranspiration rate of potted lettuce presented a peak curve during the day.The order of evapotranspiration rates at each growth stage was ranked as middle,late,early stage.The linear correlation between evapotranspiration rate,solar radiation and atmospheric saturation vapor pressure was 0.86 and 0.78,respectively.The measured results of the system were basically consistent with the existing studies,which could better reflect the change trend of evapotranspiration of potted plants during the whole growth cycle,and provide high-precision and highly reliable intelligent equipment support for online multi-point monitoring of plant evapotranspiration.