Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Verifying the Possibility of Investigating Tree Ages Using Resistograph

레지스토그래피를 이용한 수령조사 가능성 검토

  • Oh, Jung-ae (Wood Products Analysis & Certification Division, Korea Forestry Promotion Institute) ;
  • Seo, Jeong-Wook (Department of Wood and Paper Science, Chungbuk National University) ;
  • Kim, Byung-Ro (Department of Wood and Paper Science, Chungbuk National University)
  • Received : 2018.10.25
  • Accepted : 2019.01.03
  • Published : 2019.01.25
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Abstract

This study aims to determine the ideal feed speed of a resistograph to evaluate the number of tree rings in several tree species. The needle speed was fixed at 1,500 r/min. Herein, various tree species, such as Pseudotsuga menziesii, Pinus koraiensis, Abies holophylla, and Zelkova serrata, were considered for experiments. Results showed that the most proper feed speed for Zelkova serrata, Larix kaempferi, Pseudotsuga menziesii, Abies holophylla, and Pinus koraiensis was 75, 100, 100, 150, and 175 cm/min, respectively. However, in all the cases, the electric resistance values of tree ring narrower than 1 mm were not suitable for determining tree-ring boundaries. Upon comparing the inter-annual time series of ring widths and electric resistance values of resistograph, a meaningful synchronization was verified. If resistograph would be improved to the extent that it can measure tree rings narrower than 1 mm, it can replace the conventional method used for counting the number of tree rings in the increment cores. Additionally, it can also be used to investigate the tree growth.

본 연구는 수목의 수령을 조사하는 방법으로 레지스토그래피를 활용하는데 있어서 수종별로 가장 적합한 삽입속도를 찾기 위하여 수행되었다. 회전속도는 1,500 r/min로 고정하였다. 수종은 낙엽송, 더글라스 퍼, 잣나무, 전나무, 느티나무이다. 실험결과 수종에 따른 적합한 삽입속도는 느티나무 75 cm/min, 낙엽송과 더글라스 퍼 100 cm/min, 전나무 150 cm/min, 잣나무 175 cm/min으로 나타났다. 하지만 모든 경우에서 연륜폭이 1 mm이하일 경우 연륜경계 확인이 어려운 것으로 확인되었다. 연륜폭이 1 mm이하인 경우를 제외하고는 연륜폭측정기와 레지스토그래피의 연륜폭그래프는 매우 일치하였다. 향후 연륜폭이 1mm 이하인 미세연륜 확인이 가능한 레지스토그래피가 개발된다면 레지스토그래피가 수령조사를 위해 전통적으로 활용되는 생장편의 연륜관찰방법을 대체할 수 있을 것이다. 또한 레지스토그래피의 연륜폭그래프는 생장량 조사에도 활용할 수 있을 것으로 판단된다.

Keywords

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Fig. 1. Resistograph, where A is adapter sleeve, B is control unit, C is handle bar, and D is battery.

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Fig. 2. Ring-width measurement method for Pinus densiflora using PD-tool pro, where w is the tree-ring width.

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Fig. 3. Comparing the curves with needle speeds of (A) 1500 and (B) 2000 r/min.

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Fig. 4. Resistograph profile of softwood and hardwood, where A is Abies holophylla and B is Zelkova serrata.

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Fig. 6. Annual variations in the tree-ring widths measured by LINTAB system (dotted line) and resistograph (solid line) and the annual variations of latewood rate for Zelkova serrata.

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Fig. 7. Annual variations in tree-ring widths measured by LINTAB system (dotted line) and resistograph (solid line) and the annual variations of latewood rate for Larix kaempferi.

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Fig. 8. Cross-dating results after the removal of narrow rings (Zelkova serrata).

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Fig. 5. Annual variations in the tree-ring widths measured by LINTAB system (dotted line) and resistograph (solid line) and the annual variations of latewood rate for Abies holophylla.

Table 1. Preliminary test to compare the number of tree rings determined by the resistograph with the number of tree rings determined by the traditional tree-ring measurement technique in dendrochronology for five different tree species

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Table 2. Results of tree-ring analysis according to the feed speed of resistograph

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Table 3. Measurement results of tree-ring widths between the two methods

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Table 4. Differences of the number of tree rings between the two methods

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Table 5. t-value matrix between LINTAB and resistograph

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Table 6. Glk matrix between LINTAB and resistograph

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