Non-destructive characterization and monitoring of root structure and function at the rhizotron and field scale using spectral electrical impedance tomography (ImpTom)

使用光谱电阻抗断层扫描 (ImpTom) 在根管和田野尺度上对根结构和功能进行无损表征和监测

• 批准号: 170009198
• 负责人: Professor Dr. Andreas Kemna
• 金额: --
• 依托单位: Lehrstuhl für Geophysik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/170009198?language=en
• 关键词: Non; destructive; characterization; monitoring; root

This subproject aims at the development of spectral electrical impedance tomography (EIT) as a non-destructive tool for the imaging, characterization and monitoring of root structure and function in the subsoil at the field scale. The approach takes advantage of the capacitive properties of the soil-root interface associated with induced electrical polarization processes at the root membrane. These give rise to a characteristic electrical signature (impedance spectrum), which is measurable in an imaging framework using EIT. In the first project phase, the methodology is developed by means of controlled rhizotron experiments in the laboratory. The goal is to establish quantitative relationships between characteristics of the measured impedance spectra and parameters describing root system morphology, root growth and activity in dependence on root type, soil type and structure (with/without biopores), as well as ambient conditions. Parallel to this work, sophisticated EIT inversion algorithms, which take the natural characteristics of root system architecture into account when solving the inherent inverse problem, will be developed and tested in numerical experiments. Thus the project will provide an understanding of electrical impedance spectra in terms of root structure and function, as well as specifically adapted EIT inversion algorithms for the imaging and monitoring of root dynamics. The method will be applied at the field scale (central field trial in Klein-Altendorf), where non-destructive tools for the imaging and monitoring of subsoil root dynamics are strongly desired, but at present still lacking.

本子项目旨在开发谱电阻抗断层成像（EIT）作为一种无损工具，用于在野外尺度上对地下土壤中的根结构和功能进行成像、表征和监测。该方法利用了土壤-根界面与根膜上的感应电极化过程相关的电容性。这些产生了特征电特征（阻抗谱），在使用EIT的成像框架中可以测量。在第一个项目阶段，该方法是通过在实验室进行根瘤菌控制实验来开发的。目标是建立测量阻抗谱的特征与描述根系形态、根系生长和活性的参数之间的定量关系，这些参数依赖于根类型、土壤类型和结构（有/没有生物孔）以及环境条件。与此同时，将开发复杂的EIT反演算法，在求解固有逆问题时考虑根系结构的自然特征，并在数值实验中进行测试。因此，该项目将提供根结构和功能方面的电阻抗谱的理解，以及专门适用于根动力学成像和监测的EIT反演算法。该方法将应用于田间规模（Klein-Altendorf的中央田间试验），在那里强烈需要用于地下土壤根系动态成像和监测的非破坏性工具，但目前仍然缺乏。