Late Holocene vegetation history in south Sakhalin, northeast Asia.

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  • 南サハリンにおける後期完新世の植生変遷史
  • 南サハリンにおける後期完新生の植生変遷史
  • ミナミサハリン ニ オケル コウキカンシンセイ ノ ショクセイ ヘンセンシ

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Abstract

The Holocene vegetation history in south Sakhalin, east Asia, was reconstructed by means of pollen analysis and ^<14>C measurement for sediments obtained from four moors. Mixed forest composed mainly of Picea jezoensis and/or Picea glehnii, Abies sachalinensis, Betula and Alnus coexisting with Larix gmelinli, Pinus pumila, Quercus and Ulmus developed betwcen 〜4,600 yrBP and 300〜400 yrBP. The forest was characterised by the presence of L.gmelinii, which is the main component of the east Siberian conifer forest, and cool temperate trees such as Quercus and Ulmus. L. gmelinii increased in the moor at about 2,000 yrBP together with development of the highmoor. Quercus and Ulmus decreased markedly after 300-400 yrBP, and boreal forest of Picea, Abies, Larix, Pinus and Betula then flourished. An increase of coniferous trees occurred at 2,000 yrBP and 300-400 yrBP, and this was also recognized in the eastern part and the mountains of Hokkaido. This increase of conifers could have happened under cold climatic conditions. Tsuga pollen appeared between 3,000 and 3,800 yrBP in the moor along the Sea of Okhotsk. In Hokkaido, Tsuga pollen was also dated between 4,000 and 5,000 yrBP from the north and central coastal plain. Based on meteorological data from the northern limit of Tsuga diversifolia, Tsuga could become established along the Sea of Okhotsk coast of southern Sakhalin.

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