| Summary: | 2013-12-25 年輪年代法体験学習の教材を得るため，アラスカ州から輸入されたスプルース材の樹種同定と年代決定および産地推定を行なった．木材解剖学的特徴に基づく同定の結果，樹種はシトカスプルースに同定された．年輪年代解析の結果，15試料からAD1689–1990にわたる302年間の標準年輪曲線（AKNCCH01と命名) が得られた．AKNCCH01は，アラスカ南東部沿岸地域の標準年輪曲線とtBP > 6.5を示し，特にプリンスオブウェールズ島のものとtBP = 9.36という非常に高い値を示した．以上の結果は，これらの輸入スプルース材が，アラスカ南東部太平洋沿岸諸島で，17世紀末～現代にかけて生育したシトカスプルースであることを示唆する． In order to obtain the teaching materials for dendrochronology workshop, wood identification, tree-ring dating and dendroprovenancing survey on imported spruce woods were carried out. As a result of identification based on wood anatomical features, the species was identified as Picea sitchensis (Bong.) Carrière (sitka spruce). A tree-ring chronology with code name AKNCCH01 (it covers AD1689–1990 from 15 woods) was obtained as a result of dendrochronological analysis. AKNCCH01 was compared with chronologies of the southeastern Alaska coastal area and yielded tBP > 6.5. In particular, correlation between AKNCCH01 and chronology of the Prince of Wales Island showed a very high value of tBP = 9.36. The above results suggest that these imported sitka spruce woods have grown at the southeastern Alaska Pacific coastal area, from the end of 17th century to the present. departmental bulletin paper
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