Abies-dominated Forest of the Latest Last Glacial in Southwestern Hokkaido: Reconstruction from Wood and Pollen Fossils.

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  • 最終氷期末期のモミ属優占林の成立　　北海道南西部における材化石および花粉化石からの復元
  • サイシュウヒョウ キ マッキ ノ モミゾク ユウセンリン ノ セイリツ ホッカイドウ ナンセイブ ニ オケル ザイ カセキ オヨビ カフン カセキ カラ ノ フクゲン
  • Reconstruction from Wood and Pollen Fossils
  • 北海道南西部における材化石および花粉化石からの復元

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Abstract

The latest stage of the Last Glacial vegetation was reconstructed from wood and pollen fossils buried under Nigorikawa tephra (about 12, 000yrs BP), southwestern Hokkaido. Obtained wood fossil assemblages (including carbonized woods) were composed of Abies, Picea, Betula, Larix, and Rosa. Abies could be assigned to Abies sachalinensis and Larix could be Larix gmelinii, based on previous plant macrofossil studies. Arboreal pollen assemblages composed of Abies, Picea, Pinus, Betula, Alnus, Carpumus, and Ulmus were concordant with wood fossil composition. Non-arboreal pollen and spore assemblages are abundant in ferns associated with Artemisia, Gramineae, and Cyperaceae. Reconstructed forests are dominated with Abies, accompanied by Picea, Betula, Alnus, and Rosa, and herbaceous layers are composed mainly of ferns and small amounts of Artemisia, Gramineae, and Cyperaceae. Abies sachalinensis-dominated forests at the latest Last Glacial in the region are considered to reflect a milder climate than that of the Last Glacial Maximum.

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