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

A ground-penetrating radar and underground root technology, which is applied in the field of measuring the diameter and biomass of plant underground roots, can solve the problems of unrecognizable, limited to qualitative mapping, and quantitative research has not been completely successful, and achieves the effect of strong correlation

Inactive Publication Date: 2010-08-25
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 and biomass of plant underground roots by using ground penetrating radar
  • Method for measuring diameter and biomass of plant underground roots by using ground penetrating radar
  • Method for measuring diameter and biomass of plant underground roots by using ground penetrating radar

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Embodiment 1

[0035] Embodiment 1 Measurement method

[0036] Studies have shown that there is a very clear linear relationship between the biomass of the underground roots of plants of the same length and the square value of the root diameter. Figure 2 shows the relationship between the square value of the root diameter and the biomass of the root, such as As shown in Figure 2, the square value of the root diameter and the coefficient of determination R of the biomass of the root 2 All reached above 0.99. Based on this, the present invention proposes a new method that can use GPR to measure the biomass of underground roots in practical application.

[0037] First, measure the root density of the root by collecting a small amount of root samples, and use GPR to measure the diameter at multiple positions of the root to obtain the average diameter of the root. At this time, it is assumed that the root is a cylinder, and then according to the measured root diameter (average diameter) and the...

Embodiment 2

[0052] Example 2 Measurement of characteristic constant K

[0053] 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:

[0054] 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 .

[0055] That is to say, in t...

Embodiment 3

[0057] Embodiment 3 Verifies the correlation experiment of measuring diameter

[0058] Referring to FIG. 6 , this embodiment shows 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.

[0059] As shown in Figure 6, 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.

[0060] What Fig. 7 shows is the relationship diagram between the estimated root diameter value and its actual root diameter obtained by using the time parameter ΔT obtained by detecting another group of root diameters and the characteristic constant K obtained in Fig. 6, as shown in Fig. 7, from The similarity between the estimated...

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Abstract

The invention provides a method for measuring the biomass of plant underground roots by using ground penetrating radar. The method comprises the following steps of: measuring the root density p of the underground roots by collecting a sample of the underground roots; measuring the diameter D of the underground roots by using the ground penetrating radar, obtaining the length L of the underground roots through the measurement of the ground penetrating radar, and if the underground roots are a cylinder, calculating the volume of the cylinder according to the diameter D and length L of the underground roots obtained through the measurement; and estimating the magnitude of the biomass of the underground roots by using a formula W=piD2LRho / 4, wherein W refers to the estimated biomass. The method has the advantages that: the diameter of the plant underground roots can be accurately and quantitatively measured through the ground penetrating radar so that the biomass of the underground roots can be indirectly obtained; 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 and biomass of underground roots of plants, in particular to a method for obtaining the biomass of underground roots of plants by using ground-penetrating radar to measure parameters such as the diameter of underground roots of plants. 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, ...

Claims

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Application Information

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