Palynological Study of the Deposits from the Uryu-Numa Moor in Mt. Shokanbetsu, Hokkaido

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  • 暑寒別岳雨竜沼湿原の花粉分析的研究
  • ショカンベツダケ ウリュウヌマ シツゲン ノ カフン ブンセキテキ ケンキュウ

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Abstract

1) The following five pollen zones were distinguished in palynological analysis of deposits of the Uryu-Numa moor situated at 43°41′48″N lat., 141°36′30″E long., alt. ca. 850m:<br>Ur-I: Betula-Picea zone (depth: 340-280cm)<br>Ur-II: Betula zone (280-260cm)<br>Ur-III: Betula-Quercus-Ulmus-Juglans zone (260-220cm)<br>Ur-IV: Quercus-Betula-Ulmus-Juglans zone (220-120cm)<br>Ur-V: Quercus-Betula zone (120-0cm)<br>2) Ur-I, Ur-II, Ur-III·IV and Ur-V respectively correspond to LG, R-I, R-II and R-III of the Chippubetsu moor pollen sequence (Nakamura 1968).<br>3) The boundary of Ur-I/Ur-II, Ur-II/Ur-III, Ur-III/Ur-IV and Ur-IV/Ur-V are ca. 8, 900y. B. P., ca. 8, 200y. B. P., ca. 7, 000y. B. P. and ca. 3, 800y. B. P. respectively.<br>4) The Uryu-Numa moor was in the alpine zone during the Late-Glacial period.<br>5) Two explanations can be possible for the vegetation of the Climatic Optimum period; i) The Uryu-Numa moor was in the Pan mixed forest zone. ii) Treeless environment was developed in the area which is presently occupied by subalpine zone.

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