西南北海道横津岳における最終氷期以降の植生変遷

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タイトル別名
  • Vegetational History of Mt. Yokotsudake, Southwestern Hokkaido, since the Last Glacial.
  • セイナン ホッカイドウ ヨコツダケ ニ オケル サイシュウ ヒョウキ イコウ

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The vegetational history during the last 15, 000 years of Mt. Yokotsudake in southwestern Hokkaido (1, 167m elevation) was reconstructed based on three pollen study sites. Before 12, 000yrs BP, sub-boreal forest dominated by Picea dominated on Mt. Yokotsudake, and the presence of Selaginella selaginoides on the mountainside (about 600m elevation) indicated a very cold climate. Continuous occurrence of Quercus pollen indicates sparse distribution of Quercus mongorica var. grosseserrata, a principal cool temperate species in Hokkaido, in the sub-boreal forest during the time. Late glacial climatic change is clearly recognized by on increase (in Alleröd interstadial) and a decrease (in Younger Dryas stadial) of cool temperate elements such as Quercus and Fagus. The sub-boreal forest was completely replaced by cool temperate forest at the end of the Last Glacial (10, 000yrs BP). The cool temperate forest from 10, 000 to 5, 000/6, 000yrs BP was mainly composed of Quercus mongorica var. grosseserrata associated with small amounts of Fagus crenata. Fagus crenata dominated the forest established above 600m elevation until 6, 000yrs BP, when it invaded and replaced Quercus mongorica var. grosseserrata forests after the Hypsithermal time. This study shows that Fagus crenata lived in refugia through the Last Glacial in Yokotsudake, and extended their range after the end of the Last Glacial.

収録刊行物

  • 第四紀研究

    第四紀研究 36 (4), 217-234, 1997

    日本第四紀学会

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