• Title/Summary/Keyword: tree-rings

검색결과 84건 처리시간 0.026초

선릉 정자각 목부재의 연륜연대 분석 (Tree-Ring Dating of Wood Elements for Jeongjagak of Seonreung, Seoul, Korea)

  • 손병화;한상효;박원규
    • 한국가구학회지
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    • 제23권2호
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    • pp.222-228
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    • 2012
  • Seonreung is the tomb of Seong-jong (A.D. 1457~1494), the 9th king of Joseon Dynasty (1392-1910) and his second queen Jeonghyeon-wanghu (1462~1530). We obtained dendrochronological dates of Jeongjagak (ceremonial hall) of Seonreung. It was known first built in 1495 and reconstructed in October 1706, We obtained tree-ring dates of 20 wood elements (beams, pillars, truss posts, cant strips, roof boards and roof loaders). Their outermost rings were dated from 1630 to 1705. The dates of bark rings in four elements were A.D. 1705 with completed latewoods, indicating that these woods were cut some time between the autumn of 1705 and spring of 1706. The results confirmed the reconstruction date Jeongjagak of Seonreung in 1706, suggesting that there was not so long period for wood drying or storage, i.e., less than 6 months. The dates of outermost rings prior to 1705 in other elements indicated that some outer rings of these elements were removed during wood processing. Tree-ring dating proved that the present Jeongjagak of Seonreung had been well preserved for more than 300 years.

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레지스토그래피를 이용한 수령조사 가능성 검토 (Verifying the Possibility of Investigating Tree Ages Using Resistograph)

  • Oh, Jung-ae;Seo, Jeong-Wook;Kim, Byung-Ro
    • Journal of the Korean Wood Science and Technology
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    • 제47권1호
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    • pp.90-100
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    • 2019
  • 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.

Determinate the Number of Growth Rings Using Resistograph with Tree-Ring Chronology to Investigate Ages of Big Old Trees

  • OH, Jung-Ae;SEO, Jeong-Wook;KIM, Byung-Ro
    • Journal of the Korean Wood Science and Technology
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    • 제47권6호
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    • pp.700-708
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    • 2019
  • To verify the possibility of using resistograph to estimate the age of big old living trees, we selected three Zelkova serrata and seven Pinus densiflora in Goesan. The mean diameters at breast height of Z. serrata and P. densiflora were 102 (92-116) cm and 80 (65-110) cm, respectively. The heights measured from the ground using a resistograph ranged at 1.2-4.3 m and 0.6-1.1 m for Z. serrata and P. Densiflora, respectively. The most appropriate needle speed to determine tree-ring boundaries for measuring ring width was 1500 r/min for both tree species. Alternatively, the suitable feed speeds for Z. serrata and P. densiflora were 50 cm/min and 150 cm/min, respectively. From the measured data, the mean numbers of tree rings of Z. serrata and P. densiflora were 57 (43-68) and 104 (93-124), respectively, and the mean tree-ring widths were 4.27 mm (3.18-5.09 mm) and 2.93 mm (2.32-3.34 mm), respectively. A comparison between the time series of tree-ring widths by resistograph and that from the local master chronologies tallied for the heartwood part. Finally, this study showed that resistograph can be used to estimate tree ages when a local master chronology is available.

Tree Ring Ca/Al as an Indicator of Historical Soil Acidification of Pinus Densiflora Forest in Southern Korea

  • Lee, Kwang-Seung;Hung, Dinh Viet;Kwak, Jin-Hyeob;Lim, Sang-Sun;Lee, Kye-Han;Choi, Woo-Jung
    • 한국환경농학회지
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    • 제30권3호
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    • pp.229-233
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    • 2011
  • BACKGROUND: Soil acidification, which is known to be one of the reasons of forest decline, is associated with decreases in exchangeable Ca and increases in Al concentration, leading to low Ca/Al ratio in soil solution. As tree rings are datable archives of environmental changes, Ca/Al ratios of annual growth ring may show decreasing pattern in accordance with the progress of soil acidification. This study was conducted to investigate Ca/Al pattern of Pinus densiflora tree ring in an attempt to test its usefulness as an indicator of historical soil acidification. METHODS AND RESULTS: Three P. densiflora tree disks were collected from P. densiflora forests in Jeonnam province, and soil samples (0-10, 10-20, and 20-30 cm in depth) were also collected from the tree locations. Soils were analyzed for pH and exchangeable Ca and Al concentrations, and Ca/Al was calculated. Annual growth rings formed between 1969 and 2007 were separated and analyzed for Ca/Al. Soil Ca/Al was positively (P<0.01) correlated with soil pH, suggesting that soil acidification decreased Ca while increasing Al availability, lowering Ca/Al in soil solution. The Ca/Al of tree rings also showed a decreasing pattern from 18.2 to 5.5 during the period, and this seemed to reflect historical acidification of the soils. CONCLUSION(s): The relationship between soil pH and Ca/Al and the decreasing pattern of Ca/Al of tree ring suggest that Ca/Al of tree ring needs to be considered as a proxy of the progress of soil acidification in P. densiflora forest in southern Korea.

한국산 소나무의 지역에 따른 해부학적 특성 (Anatomical Characteristics of Korean Red Pines According to Provinces)

  • 김민지;서정욱;김병로
    • Journal of the Korean Wood Science and Technology
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    • 제46권1호
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    • pp.100-106
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    • 2018
  • 본 연구는 우리나라에서 주요 용재로 사용되고 있는 소나무의 생장지역에 따른 해부학적 특성을 조사하기 위하여 실시하였다. 지역 간 비교를 위해 태백산맥을 기준으로 영동(고성), 영서(홍천), 영남(봉화) 세 지역을 선정하였다. 같은 연도에 형성된 연륜을 사용하기 위해 연륜연대학의 크로스데이팅법으로 벌채연도를 분석한 결과, 고성, 홍천 및 봉화 산 목재의 벌채연도가 각각 2014, 2012, 2014년으로 나타났다. 분석된 벌채연도를 토대로 각 지역에서 채취된 소나무의 미성숙재(수부터 20번째 연륜까지), 심재(연륜 생성연도: 1955~1964y), 변재(연륜 생성연도: 2002~2011y)를 대상으로 가도관 길이와 직경을 측정하였다. 산지 간 가도관 길이는 미성숙재에서는 차이를 보이지 않았으나 심재와 변재부에서는 봉화, 홍천 고성 산 순으로 나타났다. 가도관 직경의 경우도 봉화 산이 높게 나타났다. 가도관 길이의 방사방향변이는 약 20년 전후에 증가하다가 안정되는 경향을 보였다. 현미경을 이용한 목재해부학적 관찰에 따르면 세 지역 모두 전형적인 소나무의 특성을 보였다.

The Variation of Radiocarbon-14 Content in the Atmosphere

  • Kyung Rin Yang
    • 대한화학회지
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    • 제15권6호
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    • pp.370-377
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    • 1971
  • The Carbon-14 content in surface air at Seoul, Korea, was measured from February 1970 to August 1971 and a Larix Leptolepis, Gordon tree (Ip-Gal Namu) grown at Kwang-Nung, Kyunggi-Do, Korea, having 37 growth rings, was assayde for $^{14}C$. From the results of the surface air study, it was calculated that during the above period the inventory of excess $^{14}C$ in the atmosphere decreased with a half-time of 4.6 years. The overall yearly decrease was also checked. The tree-ring study showed that the tree's atmosphere was affected by $^{14}C$ from nuclear tests after 1956. In one study, atmospheric $CO^2$ samples were collected bi-monthly by the absorption of $CO^2$ in alkaline hydroxide solution. In the other, 5 year annual growth rings were assayed for radiocarbon. For the radioactivity measurement, carbon atoms in samples were converted to carbon atoms of benzene. The resulting benzene was taken as primary solvent for liquid scintillation counting.

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대기오염지역(大氣汚染地域)의 해송(海松) 연륜(年輪) 속의 중금속(重金屬) 분석(分析) (Analysis of Heavy Metals in Annual Rings of Pinus thunbergii at Air Polluted Area)

  • 김종갑;오기철
    • 한국산림과학회지
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    • 제88권4호
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    • pp.429-437
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    • 1999
  • 대기오염지역에서 중금속오염의 영향을 파악하기 위해서 온산공단 주변에서 생육하고 있는 해송을 원판으로 채취하여 연륜 속의 중금속함량을 3년씩 나누어 분석하였다. 온산공단지역에서 연륜폭의 변화는 공장이 가동된 이후부터 감소하기 시작하였으며, 1991년 이후에는 급격한 감소현상이 나타나 해송의 가시적인 쇠퇴현상과 일치하였다. 온산공단지역 해송 연륜 속의 카드뮴 함량은 119.4ppb에서 867ppb로 나타났으며 1992년 이후에 급격히 증가하였다. 구리 함량은 최저 309.5ppb에서 최고 3686.8ppb로 나타났다. 납의 함량은 911.33ppb에서 7997.1ppb로 나타냈으며, 1970년 이후부터 증가하기 시작하여 공장가동 이후인 1980년 이후에는 증가폭이 컸다. 아연의 함량은 3528.7ppb에서 23826.7ppb로 나타났으며, 1960년 이후부터 큰 폭으로 상승하였고 1992년 이후에는 급 상승하는 경향이었다. 한편 비오염지역인 고성지역 해송 연륜 속의 중금속 함량은 모두 온산공단 지역보다는 많이 낮았으며, 특히 1990년 이후에는 차이가 컸다. 온산과 고성지역 해송의 수피에 축적되어 있는 중금속을 분석한 결과, 카드뮴 함량에서는 10배, 구리 함량에서는 1000배, 납 함량은 285배, 아연 함량에서는 133배의 차이를 나타내었다. 원판과 core의 분석에서는 일반적으로 core속의 중금속 함량이 높게 나타났으며, 특히 납에서는 차이가 컸다. 그러나 연륜별 증감의 패턴은 비슷한 경향을 나타내었다.

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백두대간 마루금일대 소나무의 연륜생장과 기후와의 관계 (Relationships between Climate and Tree-Rings of Pinus densiflora in the Ridges of the Baekdudaegan, Korea)

  • 박상곤;주성현;이광희;박원규
    • 농업생명과학연구
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    • 제44권5호
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    • pp.35-43
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    • 2010
  • 백두대간의 마루금일대에 자라는 소나무 연륜생장과 기후와의 관계를 알아보기 위하여 21개 지역에서 48본 시료의 연륜을 분석하였다. 모든 지역의 소나무 연륜패턴이 서로 크로스데이팅 되어 우리나라 소나무의 생장이 기후에 크게 영향을 받는다는 것을 알 수 있었다. 이들 연륜연대기는 3개의 군집으로 구분할 수 있었는데, 지역적으로 그리고 해발 고도에 따라 분류되지 않아 백두대간에 분포하는 소나무의 연륜생장은 지역이나 고도보다는 미소 (microsite) 생육환경에 따른 생장량의 대소에 따라 분류되는 것을 알 수 있었다. 백두대간 소나무의 연륜생장과 기후(월 강수량과 월 평균기온)와의 관계를 상관계수로 분석한 결과, 백두대간 소나무의 연륜생장은 강수보다는 기온에 영향을 많이 받으며, 생장이 양호한 군집이 기후의 영향을 덜 받는 것으로 나타났다.

Temperature Fluctuations Over the Past 2000 Years in Western Mongolia

  • Pederson, Neil;Jacoby, Gordon C.;D′Arrigo, Rosanne.;Frank, David;Buckley, Brendan;Nachin, Baatarbileg;Chultem, Dugarjav;Renchin, Mijiddorj
    • 한국제4기학회지
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    • 제17권2호
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    • pp.157-159
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    • 2003
  • Much of northern Asia is lacking in high-resolution palaeoclimatic data coverage. This vast region thus represents a sizeable gap in data sets used to reconstruct hemispheric-scale temperature trends for the past millennium. To improve coverage, we present a regional-scale composite of four tree-ring width records of Siberian pine and Siberian larch from temperature-sensitive alpine timber-line sites in Mongolia. The chronologies load closely in principal components analysis (PCA) with the first eigenvector accounting for over 53% of the variance from ad 1450 to 1998. The 20-year interval from 1974 to 1993 is the highest such growth period in this composite record, and 17 of the 20 highest growth years have occurred since 1946. Thus these trees, unlike those recently described at some northern sites, do not appear to have lost their temperature sensitivity, and suggest that recent decades have been some of the warmest in the past 500 years for this region. There are, however, comparable periods of inferred, local warmth for individual sites, e.g., in 1520-1580 and 1760-1790. The percent common variance between chronologies has increased through time and is highest (66.1%) in the present century. Although there are obvious differences among the individual chronologies, this result suggests a coherent signal which we consider to be related to temperature. The PCA scores show trends which strongly resemble those seen in recent temperature reconstructions for the Northern Hemisphere, very few of which included representation from Eurasia east of the Ural Mountains. The Mongolia series therefore provides independent corroboration for these reconstructions and their indications of unusual wanning during the twentieth century.

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Dendrochronological Dating of Coffin Woods from Hoamdong, Chungju, Korea

  • Park, Won-Kyu;Kim, Sang-Kyu;Han, Sang-Hyo
    • 한국가구학회지
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    • 제19권2호
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    • pp.130-136
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    • 2008
  • The objective of this study was to date coffin woods of a grave of husband and wife, using the tree rings, which were excavated from Hoamdong, Chungju city in the central area of South Korea. The species of coffin woods was Japanese Red Pine (Pinus densiflora S. et Z.), one of the major conifers growing in Korea. The husband coffin was dated as A.D. 1628. Due to the absence of bark in the wife's coffin, the number of sapwood rings was estimated to obtain the cutting date. The cutting date of wife's one was estimated to be A.D. 1651${\pm}$10. The Jeogori Jacket for women, which was found in the husband coffin, indicates that the husband died earlier than the wife, as the tree-ring dates suggested.

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