연륜고고학적 연구에 있어 곰솔의 연륜으로 작성된 산소동위원소 시계열 그래프의활용 가능성 조사
Investigating the Potential of the Tree-ring δ18O Time Series of Pinus thunbergii in the Dendroarchaeological Study
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연륜고고학의 주요 내용은 고목재에 있는 각각의 연륜에 정확한 연대를 부여하는 것이다. 각 연륜에 연도 부여가 가능한 것은 연륜폭으로 작성된 시계열 그래프(이하, 연륜폭연대기)의 패턴이 시기별로 독특하며, 동일 수종은 그 패턴을 공유하기 때문이다. 하지만 곰솔(Pinusthunbergii)은 다른 수종에 비해 연륜폭연대기 상호간 일치도가 낮아서 연대분석 활용에 어려움이 있다. 본 연구는 연륜의 폭을 대신하여 산소동위원소로 작성된 시계열 그래프(이하, 산소동위원소연륜연대기)의 패턴을 이용하여 연대분석을 할 경우 성공 가능성을 확인하기 위해 수행되었다. 연구를 위해 해안사구에서 생육하고 있는 곰솔 7본을 대상으로 연륜폭연대기와 산소동위원소연륜연대기를 작성하여 상호 비교하였다. 그 결과, 연륜폭연대기의 상호간 일치도는 통계적(t-value: 0.6~12.5 / G value: 38~70%)으로 큰 편차를 보여 연대분석 가능성에 한계를 나타냈다. 반면, 산소동위원소연륜연대기의 상호간 일치도는 통계적(t-value: 4.3~6.4 / G value:77~84%)으로 뿐만 아니라, 시각적으로도 신뢰할 수 있는 결과를 나타내 연대분석의 가능성이확인되었다. 이상의 결과를 기초로 연륜폭연대기로 연대분석이 어려운 곰솔로 제작된 목재유물의 경우 산소동위원소연륜연대기를 이용하여 연대분석을 수행한다면 성공 가능성이 크게향상됨이 확인되었다.
Abstract
The main content of dendroarchaeology is to assign the exact calendar year to each treering in archaeological wood. Each tree ring can be assigned a year because the pattern of ring-widthtime series (hereafter, ring-width chronology) is unique for each time period and the same tree speciesshare the pattern. However, the lack of agreement between ring-width chronologies of Pinus thunbergiicompared to other tree species makes it difficult to use the chronologies for dating. This study wasconducted to verify the dating possibility of archaeological woods using tree-ring δ18O time series(hereafter, tree-ring δ18O chronology) instead of ring-width chronology. For the study, 7 P. thunbergiiwere selected from coastal dunes, and the ring-width and tree-ring δ18O chronologies were compared. The results showed that the agreement between ring-width chronologies were large statistical deviations(t-value: 0.6~12.5 / G value: 38~70%) as much as difficult for dating. On the other hand, the tree-ringδ 18O chronologies showed reliable agreement between them as statistically (t-value: 4.3~6.4 / G value:77~84%) and visually. Based on the results, it has been verified that the dating possibility ofarchaeological woods for P. thunbergii, which is a difficult tree species for dating in dendrochronology,can be greatly improved if the tree-ring δ18O chronology is applied.
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