Method for measuring diameter of plant underground roots by using ground penetrating radar

A ground-penetrating radar and underground root technology, applied to measuring devices, using re-radiation, radio wave measurement systems, etc., can solve problems such as unrecognizable, quantitative research has not achieved complete success, and is limited to qualitative mapping, etc., to achieve strong correlation sexual effect

Inactive Publication Date: 2012-11-14
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

[0004]However, the use of ground penetrating radar to study root distribution is still largely limited to qualitative mapping, and quantitative research has not yet achieved complete success
Moreover, this type of research is currently limited to drawing lateral roots with a root diameter greater than 20 mm, and cannot identify fine roots with a root diameter less than 20 mm.

Method used

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  • Method for measuring diameter of plant underground roots by using ground penetrating radar
  • Method for measuring diameter of plant underground roots by using ground penetrating radar
  • Method for measuring diameter of plant underground roots by using ground penetrating radar

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1 Measurement method

[0027] Theoretically speaking, the ability of GPR to identify the root diameter is related to the resolution of GPR. Resolution is a very important parameter to measure the detection effect of ground penetrating radar, which is defined as the ability to distinguish the smallest anomaly. The resolution of ground penetrating radar is closely related to the transmission frequency of the radar antenna. The higher the frequency, the shorter the wavelength and the stronger the resolution.

[0028] Such as figure 2 As shown, for a dielectric layer with a certain thickness underground, A-D-G in the figure represent the waveform records in the dielectric roof at high, medium and low frequencies (corresponding frequencies are 2GHz, 900MHz, 500MHz respectively); B-E-H represent 2GHz respectively , 900MHz, and 500MHz are the waveform records in the dielectric bottom plate; C-F-I represent the composite records in the top plate and the bottom pla...

Embodiment 2

[0038] Example 2 Measurement of characteristic constant K

[0039] As can be seen from Example 1, in the method for measuring the diameter of the underground root according to the present invention, the diameter D of the underground root of the plant is proportional to the time parameter ΔT, therefore, the corresponding value of the underground root of a certain plant in a certain area can be obtained by the following method The characteristic constant K, and then obtain the diameter of the underground root of the plant in the area. The specific method is as follows:

[0040] This underground root after measuring in embodiment 1 is dug out, and the diameter D of this underground root that measures digging out 1 , the specific time parameter ΔT of the actually measured underground root of the plant calculated according to the method in Example 1 1 , the characteristic constant K=D corresponding to the underground root can be obtained 1 / ΔT 1 .

[0041] That is to say, in t...

Embodiment 3

[0043] Embodiment 3 Verification test

[0044] see Figure 5 , shown in this embodiment is the correlation diagram between the time parameter ΔT obtained by detecting underground roots at different depths and the actual root diameter, wherein the frequency of the corresponding radar wave is 2 GHz.

[0045] Such as Figure 5 As shown, the correlation analysis results of the time parameter ΔT and the actual root diameter show that there is a very significant correlation between ΔT and the actual root diameter, and the coefficient of determination R 2 The value of 0.868, the root mean square error (RMSE) is 3.816mm.

[0046] Figure 6 Shown are the time parameters ΔT and Figure 5 The relationship diagram between the estimated root diameter value and the actual root diameter obtained by the characteristic constant K, such as Figure 6 As shown, the similarity between the estimated root diameter value and the measured root diameter value from the radar antenna measurement dat...

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Abstract

The invention provides a method for measuring the diameter of plant underground roots by using ground penetrating radar. The method comprises the following steps of: obtaining the specific position of the plant underground roots to be measured through the scanning of the ground penetrating radar, and generating corresponding reflected waveform scanning data; selecting an oscillogram of a reflected wave passing over the central position of the plant underground roots to be measured; and extracting a time parameter deltaT from the oscillogram so as to obtain the diameter of the plant underground roots to be measured, wherein the time parameter deltaT refers to a time period from a first arrival time of the reflected wave when an electromagnetic wave emitted by the radar arrives on the top surface of the roots to a delayed point of the reflected wave when the electromagnetic wave arrives the bottom surface of the roots. The method has the advantages that: the diameter of the plant underground roots can be accurately and quantitatively measured through the ground penetrating radar; and the obtained measuring result has high relevance to the actual diameter of the plant underground roots.

Description

technical field [0001] The invention relates to a method for measuring the diameter of underground roots of plants, in particular to a method for measuring the diameter of underground roots of plants by using ground penetrating radar. Background technique [0002] The root system plays an important role in the plant ecosystem. It can not only help plants obtain basic soil resources (such as water and nutrients) during growth and development, but also an important organ to support and fix the plant body. In addition, the contribution of the root system to the carbon cycle in the ecosystem is also indispensable, accounting for about 20% to 40% of the total forest carbon, and the root system is also the main driving force of soil respiration in the rhizosphere environment. Recently, research on the role of plant roots in global climate change has shown that the biomass of thick roots (Biomass, the total amount of organic matter (dry weight) that exists in a unit area at a certa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/89G01S7/41
Inventor 崔喜红陈晋沈金松
Owner BEIJING NORMAL UNIVERSITY
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