CN102841031A - Method for estimating water content of live stumpage sapwood - Google Patents
Method for estimating water content of live stumpage sapwood Download PDFInfo
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- CN102841031A CN102841031A CN 201210311154 CN201210311154A CN102841031A CN 102841031 A CN102841031 A CN 102841031A CN 201210311154 CN201210311154 CN 201210311154 CN 201210311154 A CN201210311154 A CN 201210311154A CN 102841031 A CN102841031 A CN 102841031A
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Abstract
A method for rapidly estimating water content of live stumpage sapwood overcomes the shortcomings of the traditional drying method that the detection process is miscellaneous and wastes time and the like, integrates the respective advantages of a drying method and a resistivity method, and can carry out rapid and field estimation on the water content of the live stumpage sapwood under the condition of not felling the live stumpage. The method comprises the steps of: a. selecting a live stumpage sample, testing by adopting a resistance type (contact pin type) timber water content determinator and recording the measurement value; b. sampling the live stumpage, and measuring the water content of the sample by the drying method; c. carrying out regression analysis on the water contents measured by the resistivity method and the drying method through adopting the least square method to construct a water content prediction model for the live stumpage sapwood; and d. carrying out correction and optimization on the model, and analyzing the sapwood water content of an unknown live stumpage by utilizing the constructed model.
Description
Technical field
The standing tree wood property that the present invention relates to live is estimated the field, relates in particular to a kind of method of can be apace, more exactly the standing tree sapwood water percentage of living being estimated.
Background technology
Moisture content is one of important physical property of timber, with the mechanical property of wood and wood utilization confidential relation is arranged.Yet still do not have can the on-the-spot method of measuring the standing tree water percentage of living exactly current, and for the forest workers, this has become a global difficult problem.For a long time, when measuring the sapwood water percentage of the standing tree of living, the normal classic method that adopts of forest workers is the sampling oven drying method: promptly utilize growth cone to get the awl core in the standing tree breastheight position of living, adopt oven drying method to measure the water percentage of timber then in the laboratory again; Or, in conjunction with timber production, cut down sample tree, and gather wood sample at the need sampling point, utilize oven drying method to measure the standing tree water percentage of living then.The advantage of this method is that measurement numerical value is accurate, can reflect the actual water percentage of standing tree alive more exactly.Its existing maximum deficiency is: test process is loaded down with trivial details, time-consuming, can not embody the water percentage of standing tree alive in real time.This is not enough brings great inconvenience for the forestry researchist, and the open-air scientific research of forestry, forest survey activity etc. are caused very big influence.
The forest workers also once attempted adopting electric-resistivity method to measure standing tree water percentage alive, and the probe that is about to resistance-type (contact pin type) moisture content measuring instrument thrusts standing tree sapwood alive, and measures its water percentage.Yet it is more accurate that the timber that this method is lower than fibre saturated point to water percentage is measured, and water percentage is higher than the timber of fibre saturated point, and measurement effect is not good enough.And the water percentage of the standing tree of living all will be far above its fibre saturated point, thereby result that this method is surveyed can not reflect the actual water percentage of standing tree alive well.
Therefore, need inquiring into can be fast, accurately, on-site real-time, to the detection method of the smaller standing tree moisture content alive of standing tree damage of living.
Summary of the invention
Based on above-mentioned existing in prior technology problem, embodiment of the present invention provide a kind of can be apace, on-site real-time ground carries out forecast method to the standing tree sapwood water percentage of living.This method has overcome that the sampling oven drying method that adopted for a long time measures that the existing testing process of moisture content is numerous and diverse, shortcoming such as during test fee; The advantage that integrated oven drying method and electric-resistivity method are had separately can be carried out on-the-spot apace estimation to its sapwood water percentage under the condition of not cuting down standing tree alive.
The step of the quick estimating and measuring method of this standing tree sapwood water percentage alive provided by the present invention is following:
(1) chooses some in standing tree sample alive (generally greater than 30), it is carried out label;
(2) to each standing tree sample of living; Select test position at the sunny side and the back of the standing tree sample breastheight position of living respectively; The probe of resistance-type (contact pin type) moisture content analyzer is thrust the test sample position, and read the measurement numerical value of resistance-type (contact pin type) moisture content analyzer;
(3) near resistance-type (contact pin type) moisture content analyzer test position; Adopt growth cone collection awl core; The production standard sample; Utilize drying baker that standard sample is carried out drying in the laboratory, and utilize balance measurement standard sample moist wood quality and over dry quality, calculate the water percentage of standard of wood sample;
(4) adopt least square method that resistance-type (contact pin type) moisture content analyzer in the above-mentioned steps (2) measured water percentage numerical value and the middle measured water percentage of oven drying method of above-mentioned steps (3) are carried out regretional analysis, make up the standing tree sapwood water cut prediction of living;
(5) according to indexs such as the related coefficient of constructed model, standard deviation, the coefficient of variation, adopt mathematical method, above-mentioned constructed standing tree sapwood water cut prediction alive is proofreaied and correct and optimized;
(6) utilize above-mentioned optimized model, need not take a sample and dry processing, only need to adopt resistance-type (contact pin type) moisture content analyzer that the standing tree of living is tested, can predict the sapwood water percentage of the unknown standing tree of living the standing tree of living.
The standing tree sample of living in the said step (1) comprises broad leaf tree and conifer sample.
The probe of resistance-type (contact pin type) moisture content analyzer need penetrate bark in the said step (2) in test process, touches the sapwood xylem.
The measured water percentage numerical value of resistance-type (contact pin type) moisture content analyzer of participating in regretional analysis in the said step (4) is the standing tree back sapwood water percentage alive measured in the said step (2) and the mean value of sunny side sapwood water percentage.
Description of drawings
Fig. 1 is the standing tree sapwood water cut prediction figure alive that method provided by the present invention is set up.
Embodiment
The step that exemplary embodiments of the present invention is measured the quick estimating and measuring method of standing tree sapwood water percentage of living is following:
(1) the standing tree Sample selection of living.Choose sample some of standing tree (generally greater than 30) alive, it is carried out label;
(2) the standing tree test sample of living.To each standing tree sample of living; Select test position at the sunny side and the back of the standing tree sample breastheight position of living respectively; The probe of resistance-type (contact pin type) moisture content analyzer is thrust the test sample position, and read the measurement numerical value of resistance-type (contact pin type) moisture content analyzer;
(3) standard of wood sample collection and measurement of water-content coefficient.Near resistance-type (contact pin type) moisture content analyzer test position; Adopt growth cone collection awl core; The production standard sample; Utilize drying baker that standard sample is carried out drying in the laboratory, and utilize balance measurement standard sample moist wood quality and over dry quality, calculate the water percentage of standard of wood sample;
(4) the standing tree sapwood water cut prediction of living makes up.Adopt least square method that resistance-type (contact pin type) moisture content analyzer in the above-mentioned steps (2) measured water percentage numerical value and the middle measured water percentage of oven drying method of above-mentioned steps (3) are carried out regretional analysis, make up the standing tree sapwood water cut prediction of living;
(5) the standing tree sapwood water cut prediction of living is optimized.According to indexs such as the related coefficient of constructed model, standard deviation, the coefficient of variation, adopt mathematical method, above-mentioned constructed standing tree sapwood water cut prediction alive is proofreaied and correct and optimized;
(6) the standing tree sapwood water percentage of living is judged.Utilize above-mentioned optimized model, need not take a sample and dry processing, only need to adopt resistance-type (contact pin type) moisture content analyzer that the standing tree of living is tested, can predict the sapwood water percentage of the unknown standing tree of living the standing tree of living.
The above; Be the preferable embodiment of the present invention; Protection scope of the present invention is not limited to listed embodiment; Any technician who is familiar with the present technique field is in the technical scope that the present invention discloses, and the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Embodiment of the invention test result is seen table 1 and continuous table 1.
Table 1 method prediction sapwood water percentage provided by the present invention and oven drying method are measured the sapwood water percentage relatively
Continuous table 1 method prediction sapwood water percentage provided by the present invention and oven drying method are measured the sapwood water percentage relatively
Claims (4)
1. quick estimating and measuring method of standing tree sapwood water percentage alive is characterized in that may further comprise the steps:
(1) chooses some in standing tree sample alive (generally greater than 30), it is carried out label;
(2) to each standing tree sample of living; Select test position at the sunny side and the back of the standing tree sample breastheight position of living respectively; The probe of resistance-type (contact pin type) moisture content analyzer is thrust the test sample position, and read the measurement numerical value of resistance-type (contact pin type) moisture content analyzer;
(3) near resistance-type (contact pin type) moisture content analyzer test position; Adopt growth cone collection awl core; The production standard sample; Utilize drying baker that standard sample is carried out drying in the laboratory, and utilize balance measurement standard sample moist wood quality and over dry quality, calculate the water percentage of standard of wood sample;
(4) adopt least square method that resistance-type (contact pin type) moisture content analyzer in the above-mentioned steps (2) measured water percentage numerical value and the middle measured water percentage of oven drying method of above-mentioned steps (3) are carried out regretional analysis, make up the standing tree sapwood water cut prediction of living;
(5) according to indexs such as the related coefficient of constructed model, standard deviation, the coefficient of variation, adopt mathematical method, above-mentioned constructed standing tree sapwood water cut prediction alive is proofreaied and correct and optimized;
(6) utilize above-mentioned optimized model, need not take a sample and dry processing, only need to adopt resistance-type (contact pin type) moisture content analyzer that the standing tree of living is tested, can predict the sapwood water percentage of the unknown standing tree of living the standing tree of living.
2. method according to claim 1 is characterized in that: the standing tree sample of living in the said step (1) comprises broad leaf tree and conifer sample.
3. method according to claim 1 is characterized in that: the probe of resistance-type (contact pin type) moisture content analyzer need penetrate bark in the said step (2) in test process, touches the sapwood xylem.
4. method according to claim 1 is characterized in that: the measured water percentage numerical value of resistance-type (contact pin type) moisture content analyzer of participating in regretional analysis in the said step (4) is the standing tree back sapwood water percentage alive measured in the said step (2) and the mean value of sunny side sapwood water percentage.
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| CN 201210311154 CN102841031A (en) | 2012-08-29 | 2012-08-29 | Method for estimating water content of live stumpage sapwood |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764673A (en) * | 2015-04-08 | 2015-07-08 | 梅州市汇胜木制品有限公司 | Full-scale detection method for water content of wood |
| CN106018685A (en) * | 2016-05-13 | 2016-10-12 | 福建森宝食品集团股份有限公司 | Feed moisture quick measuring method |
| CN110595341A (en) * | 2019-09-16 | 2019-12-20 | 浙江水利水电学院 | Resistivity method-based method for obtaining width of sapwood |
| CN111189885A (en) * | 2020-01-08 | 2020-05-22 | 天津农学院 | Trunk moisture content measuring method and device based on equivalent power supply internal resistance |
| CN111189886A (en) * | 2020-01-08 | 2020-05-22 | 天津农学院 | Method for measuring moisture content of trunk |
| CN111366685A (en) * | 2020-03-30 | 2020-07-03 | 国际竹藤中心安徽太平试验中心 | Method for calculating water content of air-dried bamboo |
| CN111426884A (en) * | 2020-04-24 | 2020-07-17 | 东北林业大学 | Method for mapping wood cross section resistance distribution |
| CN112378982A (en) * | 2020-10-15 | 2021-02-19 | 中国林业科学研究院木材工业研究所 | On-line detection method and device for water content of wood |
-
2012
- 2012-08-29 CN CN 201210311154 patent/CN102841031A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764673A (en) * | 2015-04-08 | 2015-07-08 | 梅州市汇胜木制品有限公司 | Full-scale detection method for water content of wood |
| CN106018685A (en) * | 2016-05-13 | 2016-10-12 | 福建森宝食品集团股份有限公司 | Feed moisture quick measuring method |
| CN110595341A (en) * | 2019-09-16 | 2019-12-20 | 浙江水利水电学院 | Resistivity method-based method for obtaining width of sapwood |
| CN111189885A (en) * | 2020-01-08 | 2020-05-22 | 天津农学院 | Trunk moisture content measuring method and device based on equivalent power supply internal resistance |
| CN111189886A (en) * | 2020-01-08 | 2020-05-22 | 天津农学院 | Method for measuring moisture content of trunk |
| CN111189886B (en) * | 2020-01-08 | 2022-05-03 | 天津农学院 | Method for measuring moisture content of trunk |
| CN111366685A (en) * | 2020-03-30 | 2020-07-03 | 国际竹藤中心安徽太平试验中心 | Method for calculating water content of air-dried bamboo |
| CN111426884A (en) * | 2020-04-24 | 2020-07-17 | 东北林业大学 | Method for mapping wood cross section resistance distribution |
| CN112378982A (en) * | 2020-10-15 | 2021-02-19 | 中国林业科学研究院木材工业研究所 | On-line detection method and device for water content of wood |
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Application publication date: 20121226 |