深层土壤硝态氮原位实时检测系统设计与开发  

Design and Development of In-situ Real-time Detection System for Nitrate Nitrogen in Deep Soil

作　　者：赵燕东[1,2] 常诚至 赵玥 刘卫平[1,2] Zhao Yandong;Chang Chengzhi;Zhao Yue;Liu Weiping(The School of Technology,Beijing Forestry University,Beijing 100083,China;Beijing Laboratory of Urban and Rural Ecological Environment,Beijing 100083,China;Forest and Grass Ecological Carbon Neutralization Smart Perception Institute,Beijing 100083,China)

机构地区：[1]北京林业大学工学院,北京100083 [2]城乡生态环境北京实验室,北京100083 [3]林草生态碳中和智慧感知研究院,北京100083

出　　处：《农业技术与装备》2024年第6期1-4,7,共5页Agricultural Technology & Equipment

基　　金：国家重点研发计划项目(2020YFD1000500)。

摘　　要：硝酸盐是植物氮素营养的重要来源,低成本、微损的深层土壤硝态氮含量原位检测一直存在瓶颈。基于土壤光谱特性,设计了一款低成本、深层土壤硝态氮原位实时检测系统。该系统基于单光谱波段,可深层植入土壤中进行原位测量,利用钛烧结滤芯采集土壤溶液,通过220 nm波段的紫外光灯作为照射光源,根据吸光度原理和电压电流转换放大电路,检测采集到的土壤溶液中硝态氮的含量,同时采用LoRa无线传输模块将数据自主传输至上位机,无需人工干预,无需对土壤样本进行采集和处理,不仅降低了检测成本,而且降低了人力成本。土壤硝态氮预测模型的预测决定系数R^(2)、相关系数R、均方根误差RMSE分别为0.9822、0.9911、0.0092,满足实际应用测量的准确度。Nitrate is an important source of plant nitrogen nutrition,and low-cost,minimally destructive in situ detection of nitrate-nitrogen content in deep soil has been a bottleneck.This study designed a low-cost,deep soil nitrate nitrogen in situ real-time detection system based on soil spectral characteristics.The system is based on a single spectral band,which can be deeply implanted into the soil for in situ measurement.A titanium sintered cartridge was used to collect the soil solution,and a 220 nm band UV lamp was used as the irradiation light source to detect the nitrate-nitrogen content in the collected soil solution according to the principle of absorbance and the voltage-current conversion and amplification circuit,and the data were also autonomously transmitted to the supercomputer using the LoRa wireless transmission module,with no need of human intervention,no need to collect and process the soil samples,which not only greatly reduced the detection cost,but also reduced the labor cost.The prediction coefficient of determination R^(2),correlation coefficient R,and root mean square error RMSE of the soil nitrate nitrogen prediction model were 0.9822,0.9911 and 0.0092,respectively,which satisfied the accuracy of the measurement for practical applications.

关 键 词：深层土壤 硝态氮 原位测量 紫外光谱法 

分 类 号：S153.61[农业科学—土壤学]