Electrical impedance tomography imaging plant root system architecture in-situ observation method

Abstract

The invention relates to an electrical impedance tomography imaging plant root system architecture in-situ observation method which comprises the steps of 1, evenly distributing N electrodes in the soil containing a plant root system in a circular shape, sequentially applying sinusoidal alternating current (AC) on two of the electrodes, and measuring the voltage between every two adjacent electrodes in the rest electrodes to obtain voltage data; 2, carrying out finite element mesh partition on the cross section of circumference provided with the electrodes in the soil; 3, carrying out system matrix calculation on the voltage data obtained in the step 1 to obtain the resistivities of all the grids obtained in the step 2, wherein each resistivity represents the resistivity of the corresponding position in the solving domain; imaging by utilizing the resistivity data, setting different colors for units with different resistivities according to the resistivity values of the units by a red, green and blue (RGB) color mode, and judging the different resistivities of all the units according to the colors of the image; according to the difference between the root system and the surrounding soil resistivity, determining the shape and the position of the root system to realize the plant root system architecture in-situ observation.

Description

technical field [0001] The invention relates to the field of identification of plant root system configuration, in particular to an in-situ observation method of plant root system configuration by electrical impedance tomography. Background technique [0002] The existing technologies used to realize in-situ observation and identification of plant root architecture mainly include: microroot canal method, ground penetrating radar (GPR) technology, ray computer tomography (X-CT) technology, and magnetic resonance imaging (MRI) technology. . [0003] However, the common limitations of these observation techniques are that it takes a long time to complete a measurement and cannot realize real-time monitoring of plant roots, and can only be used to evaluate root biomass but not identify root health status. [0004] At the same time, they also have their own specific limitations: for example, the micro-root canal method cannot conduct comprehensive observation and measurement of ...

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Problems solved by technology

[0003] However, the common limitations of these observation techniques are: it takes a long time to complete a measurement, and it is impossible to realize real-time monitoring of plant roots. It can only be used to evaluate the root biomass and cannot distinguish the health status of the root system.

[0004] At the same time, they also have their own specific limitations: for example, the microroot canal method cannot conduct comprehensive observation and measurement of the entire root system configuration, but can only achieve two-dimensional and local observation of a specific depth of the root system; the radar signal parameters of ground penetrating radar itself are easily affected. The influence of surrounding environmental factors leads to poor measurement accuracy; in ray computed tomography (imaging is related to the density of the measured object) and nuclear magnetic resonance imaging (imaging is related to the water content of the measured object), when the root itself has the surrounding environment When the density or water content of the image is similar, the gray level distribution of the image overlaps with the gray level distribution of the surrounding medium, which leads to difficulties in post-processing, and they use nuclides or strong magnetic fields that have certain effects on plant growth, require special personnel to operate, and have a large detection system And expensive and not suitable for outdoor use

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