Use of timber resources at the Shimo-yakebe site, Tokyo, and its characteristics in the Kanto plain of the late to latest Jomon periods

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  • 東京都東村山市下宅部遺跡の 出土木材からみた関東地方の縄文時代後・晩期の木材資源利用
  • トウキョウト ヒガシムラヤマシ シモヤケベ イセキ ノ シュツド モクザイ カラ ミタ カントウ チホウ ノ ジョウモン ジダイ コウ バンキ ノ モクザイ シゲン リヨウ

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Abstract

Use of timber resources in the late to latest Jomon periods at the Shimo-yakebe site, Tokyo, was studied based on a refined chronology from detailed 14C dating by AMS. Through the periods, Castanea crenata was used preferentially for large constructions in the lowland, and other deciduous trees were employed together with Castanea crenata for smaller constructions. Comparison of the timber usage at the Shimo-yakebe site with that at three contemporaneous sites in the Kanto plain showed that Castanea crenata accounted for 50–80% of timber used for large constructions, but were used with other trees in smaller constructions. These trends seemed to show that timber was obtained mainly from artificial forests of Castanea crenata around dwelling areas for important constructions, but from a restricted area of these Castanea forests and the surrounding forests for smaller constructions. The diameter of trees used for constructions ranged more widely for larger constructions, but averaged at about 10 cm for all constructions, indicating their extraction from similar forests. At these sites, the wide ranges in the diameter and the number of growth rings among Castanea crenata trees showed that these trees were brought not from uniform forests, but from heterogeneous ones around the dwelling areas.

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