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以STM32F103VB处理器和甲烷气体传感器(Dynament MSHia-HC)为核心,设计了一种基于GPRS无线远程通信的水稻田甲烷气体在线监测系统。首先,介绍了监测系统的总体设计思路与核心结构,包括系统的硬件系统结构与软件系统设计;其次,针对甲烷传感器进行了标定、稳定性实验,在此基础上,建立了甲烷浓度预测模型;最后,选取安徽省农科院水稻实验田作为对象,连续监测了144小时的甲烷排放情况,甲烷排放速率呈周期性变化,变化周期为24小时(1天),甲烷排放速率与土壤温度呈正相关,144小时的甲烷气体平均排放速率为2.935mg·m~(-2)·h~(-1)。实验结果表明:系统能够实时监测水稻田甲烷气体单位面积的排放通量及排放速率情况,为水稻田温室气体排放监测与控制提供理论基础与数据支持。
Based on the STM32F103VB processor and methane gas sensor (Dynament MSHia-HC), a online monitoring system of methane gas in paddy field based on GPRS wireless remote communication was designed. Firstly, the overall design concept and core structure of the monitoring system are introduced, including the hardware system structure and software system design of the system. Secondly, the methane sensor calibration and stability experiments are carried out. Based on this, a methane concentration prediction model is established. Finally, we selected the experimental field of paddy rice from Anhui Academy of Agricultural Sciences as the object and continuously monitored the methane emission for 144 hours. The methane emission rate showed a cyclical change cycle of 24 hours (1 day). The methane emission rate was positively correlated with soil temperature The average methane emission rate for 144 hours was 2.935 mg · m -2 · h -1. The experimental results show that the system can monitor the methane flux per unit area of the paddy field in real time and the rate of discharge rate, and provide theoretical basis and data support for the monitoring and control of greenhouse gas emissions in paddy field.