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

A technology of ground penetrating radar and underground roots, applied in the field of measuring the biomass of underground roots of plants

Inactive Publication Date: 2011-06-22
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 Measurement method

[0033] In the present invention, in order to accurately measure the biomass of plant underground roots, what adopt is the ground-penetrating radar data measurement mode of one-dimensional form, that is, to a given measuring point position of plant underground roots (x i ,y i ), the waveform A(x i ,y i , t), such as figure 2 As shown in , which shows a schematic diagram of a typical monopulse GPR scanning waveform of an underground target. The only variable in the waveform is time. In the subsequent description of the present invention, the data obtained by such scanning is referred to as reflection waveform scanning data.

[0034] From figure 2 The obtained reflection waveform scanning data is a kind of unprocessed data. It can be seen from the figure that the reflection amplitude of the target is much smaller than the reflection amplitude of the air-ground (that is, the ground direct wave). In order to obtain the scanning data ...

Embodiment 2

[0054] Example 2 Measurement of characteristic constant K

[0055] Known by embodiment 1, according to the method for measuring the biomass of underground root of the present invention, the biomass W of plant underground root is and comprehensive index P amp_d Therefore, the characteristic constant K corresponding to the underground roots of a certain plant in a certain area can be obtained by the following method, and then the biomass of the underground roots of this plant in this area can be obtained. The specific method is as follows:

[0056] This underground root after measuring in embodiment 1 is dug out, takes the biomass W of this underground root dug out 1 , the concrete index P of this actually measured plant underground root calculated according to the method in Example 1 amp_d1 , the characteristic constant K=W corresponding to the underground root can be obtained 1 / P amp_d1 .

[0057] That is to say, in the present invention, construct an index P of ground-p...

Embodiment 3

[0060] Embodiment 3 verification test 1

[0061] In the present embodiment, utilize the method for correlation analysis to calculate, the biomass of the actual root that actually measures obtains and three kinds of frequency (2GHz, 900MHz, 500MHz) correspond respectively to the single-pulse reflected wave waveform diagram of the radar wave that extracts Three indices (P max_A , P min_A , P amp_d ) correlation coefficient R and P are shown in Table 1 and Table 2. Table 1 lists the relationship between the fresh biomass of the root and the three indices, and Table 2 lists the relationship between the dry biomass of the root and the three indices.

[0062] Table 1

[0063]

[0064] Table 2

[0065]

[0066] It can be seen from the results in the table that the three indexes corresponding to the three radar wave frequencies have obvious positive correlations with the root biomass, and the correlation coefficient R ranges from 0.63 to 0.93 (Pamp_d Both showed the stronge...

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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: 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 reflectedwave passing over the central position of the plant underground roots to be measured; extracting five waveform parameters from the oscillogram according the oscillogram; and establishing three comprehensive indexes according to the five waveform parameters so as to obtain the biomass of the measured plant underground roots. Therefore, the biomass 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 biomass of the plant underground roots.

Description

technical field [0001] The invention relates to a method for measuring the biomass of underground roots of plants, in particular to a method for measuring the biomass 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 certain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/20G01V3/12
Inventor 崔喜红陈晋沈金松
Owner BEIJING NORMAL UNIVERSITY
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