摘要
针对传统测量方法无法动态监测土壤孔隙度(n)的局限性,本研究基于热脉冲-时域反射(ThermoTDR)技术,利用改进后的Thermo-TDR探头在实验室内对不同质地土壤孔隙度和充气孔隙度(na)进行测定,并应用于野外原位动态监测土壤孔隙度,进而对热脉冲-时域反射技术测定土壤充气孔隙度的影响因素进行分析.实验表明,Thermo-TDR值与烘干法比较,室内测定均方根误差(RMSE)值为0.015,野外测定RMSE值为0.023,相对误差均在5%以内,可以准确反映土壤孔隙度的动态变化.探针间距r和热量q是影响热脉冲-时域反射技术测定土壤孔隙度的准确性的关键因素.减少探针入土时摆动导致的探针间距变化可以有效降低热脉冲-时域反射技术测定误差.Thermo-TDR技术测定迅速,准确性高且对土壤结构破坏小,具有广阔的应用前景和推广价值.
Due to the limitation of traditional methods that can not dynamically measuring the soil porosity(n)in-situ,this study monitored the dynamics soil porosity under laboratory and field condition using redesigned Thermo-TDR sensors,then analyzed the influence factor of thermo-TDR estimation.The results demonstrate that the Thermo-TDR sensor can performed reliably and accurate to monitor the dynamics of na.The RMSE value is 0.015 under laboratory condition,and 0.023 under field condition.In terms of relative error(RE),this sensor is generally within 5%.Error Analysis shows the sensor spacing(r)and heat input(q)are the major source of error.The Thermo-TDR method produces minimal soil disturbance,and is able to make rapid and repeated in situ measurements.
作者
刘晓娜
丁庆伟
LIU Xiao-na;DING Qing-wei(College of Environment and Safety,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《中北大学学报（自然科学版）》
CAS
2018年第6期774-779,共6页
Journal of North University of China(Natural Science Edition)
基金
国家自然科学基金项目(41301232)
太原科技大学博士启动基金项目(20152012)
作者简介
刘晓娜(1981-),女,讲师,博士,主要从事环境科学的研究.
