書誌事項
- タイトル別名
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- Human Impact on the Formation of the Buried Forests of Thujopsis dolabrata var. hondai in the Northeastern Part of Shimokita Peninsula, Northeastern Japan.
- シモキタ ハントウ ホクトウブ ニ ブンプ スル ヒバ マイボツリン ノ セイイン ニ カカワル ジンイテキ エイキョウ
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説明
Buried forests of Thujopsis dolabrata var. hondai are found in the northeastern part of Shimokita Peninsula. Based on 14C dates and age of B-Tm ash (ca 1, 000yrs BP), the buried humus (paleosols), which is intercalated in sand dunes, was formed at five different times: about 5, 300yrs BP, 2, 700yrs BP, 1, 000-900yrs BP, 600-500yrs BP, and 200yrs BP. If the buried humus developed on the stabilized sand dunes in the study area, the sand dunes would have formed after 5, 000yrs BP, after 2, 500yrs BP, after 1, 000yrs BP, after 600yrs BP, and after 200yrs BP. These ages are in accord with the age of formation of buried forests of Thujopsis dolabrata var. hondai, which were previously determined to be 2, 600-2, 000yrs BP, 1, 000-850yrs BP, 500yrs BP, and modern.<br>The sand dunes formed as a result of a minor sea-level drop which occurred 3, 000-2, 000yrs BP and which caused the formation of the buried forest during the period 2, 600-2, 000yrs BP.<br>The buried forest was formed not by a tsunami but by sand dunes that formed during the period 1, 000-850yrs BP. The formation of these sand dunes was probably affected by human impact.<br>There are many archaeological sites dating to the period 700-500yrs BP on the marine terraces around the study area. Iron slag and charcoal have been excavated from these sites. The latter was identified as Thujopsis dolabrata var. hondai. The sand dunes were excavated to collect iron sand, and the coastal forests were cut for charcoal, fuel, and timber. These land transformations resulted in the formation of large-scale secondary dunes, and the forest was buried after 500yrs BP.<br>Iron smelting and pasturage have been carried out around the study area since 200yrs BP, generating large volumes of the sand that eventually formed the buried forests.<br>Based on these findings, it is concluded that the formation of buried forests after 1, 000yrs BP was affected by human impact, such as the excavation of sand dunes to collect iron sand, the cutting of trees, and pasturage.
収録刊行物
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- 第四紀研究
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第四紀研究 39 (3), 215-226, 2000
日本第四紀学会
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詳細情報 詳細情報について
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- CRID
- 1390282681473407488
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- NII論文ID
- 10004720397
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- NII書誌ID
- AN0034136X
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- ISSN
- 18818129
- 04182642
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- NDL書誌ID
- 5356433
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
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- 抄録ライセンスフラグ
- 使用不可
