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Calibration method for measuring tree trunk moisture content by time domain reflectometry (TDR)

A calibration method, a technology of moisture content, applied in the direction of measuring devices, weighing by removing certain components, instruments, etc.

Inactive Publication Date: 2012-07-04
LUDONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a kind of calibration method utilizing TDR to measure the moisture content of the trunk, which mainly solves the problem of measuring the moisture content of the existing trunk. The method of water content is more destructive, time-consuming, and the result of directly measuring the moisture content of the trunk by TDR cannot represent the true moisture content of the trunk, etc.

Method used

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  • Calibration method for measuring tree trunk moisture content by time domain reflectometry (TDR)
  • Calibration method for measuring tree trunk moisture content by time domain reflectometry (TDR)

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Embodiment 1

[0020] Embodiment 1, determine a representative tree on the growing state in the area to be measured, fully supply water to it at the root until its trunk water content reaches or approaches the highest value under the natural state; Utilize electric saw or other tools to make the tree The trunk of the tree is divided into several trunk sections with a length of 20-30cm; use tools such as electric drills to drill holes on the side of each trunk section. The number, diameter and depth of the drill holes are consistent with the TDR probes to ensure that the probes can be fully inserted. The trunk section is in close contact; use a high-precision balance (sensitivity less than 1 gram) to weigh the trunk section, and record it, which is the wet weight of the trunk section, and then use TDR to measure its moisture content, measure 5 times, and take the average The measured value is taken as the measurement result and recorded, which is the measured value of the moisture content of t...

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Abstract

The invention provides a calibration method for measuring the tree trunk moisture content by a time domain reflectometry (TDR). According to the method, the TDR and a scale are respectively utilized for continuously measuring the tree trunk section moisture content (moisture content measuring value) and the wet weight, in addition, a baking method is adopted for obtaining the dry weight of the tree truck section, the measured dry weight and wet weight data of the tree truck section can be utilized for calculating the corresponding moisture containing weight during the tree trunk moisture content measurement by using the TDR in each time, the corresponding moisture content (real value) can be calculated according to the timber water content definition, and the quantitative relationship between the real water content and the corresponding moisture content measuring value data according to the obtained real water content of the tree trunk section and the corresponding moisture content measuring value data, so a calibration model for measuring the tree trunk moisture content by using the TDR is obtained. According to the calibration model, the TDR can be utilized for carrying out in-situ dynamic monitoring on the moisture content of the live tree trunk, so the tree trunk moisture content measuring process is simplified, and in addition, the measuring precision is improved.

Description

Technical field: [0001] The invention relates to the technical field of forestry science and technology, in particular to a calibration method for measuring the moisture content of tree trunks by using TDR. Background technique: [0002] Due to the multiple influences of soil moisture status, tree growth status and meteorological factors, the moisture content of tree trunks fluctuates periodically. The moisture content of the trunk directly affects the growth, development and evaporation water consumption process of the tree, and it is also an appropriate index for formulating the irrigation system of the tree. The American Society for Testing and Materials has formulated four standard wood moisture determination methods, one is the electrical measurement method, which belongs to instant determination; the other three are furnace drying method (drying method), distillation method, and titration method, all of which are damaged to a certain extent. , and relatively time-cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04G01N27/00
Inventor 杨润亚张振华柏新富潘英华何福红
Owner LUDONG UNIVERSITY
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