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- 関口 千穂
- 明治大学大学院
書誌事項
- タイトル別名
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- Vegetational Changes since the Last Glacial Period in the Mountains around Iiyama Basin, Central Japan.
- イイヤマ ボンチ シュウヘン サンチ ニ オケル サイシュウ ヒョウキ イコウ ノ ショクセイ ヘンセン
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Three peat cores were obtained by boring surveys for pollen analysis from the Kitadobu bog, the Chayaike bog, and the Numanohara bog to reveal the vegetational changes since the Last Glacial Period in the mountains around Iiyama basin, central Japan. Marker tephras AT, K-Ah, On-Kt, As-K, My-A, and My-Ot were recognized in the cores. It is clear that the deposits of the Chayaike bog were produced since the beginning of the Last Glacial Period.<br>Six regional pollen zones can be distinguished in this area. The ages, durations, and boundaries between the pollen zones were calculated from depositional rates on the basis of the marker tephras and 14C datings.<br>The vegetational changes reconstructed from these pollen zones are as follows. IB-I zone: temperate coniferous and deciduous forest in the first half of the Last Glacial Period (from ca. 93, 000 to ca. 74, 000yrs BP); IB-II zone: boreal coniferous and deciduous forest before AT was deposited (from ca. 26, 000 to ca. 25, 000yrs BP); IB-III zone: boreal forest dominated by conifer and Betula in the cold phase of the Last Glacial Period (from ca. 18, 000 to ca. 14, 000yrs BP); IB-TV zone: Betula-dominated forest in the Late Glacial (from ca. 14, 000 to ca. 10, 000yrs BP); IB-V zone: Fagus-dominated forest in the Holocene including the Climatic optimum (from ca. 10, 000 to ca. 4, 000yrs BP); IB-VI zone: Fagus-dominated forest with increased coniferous forest (from about 4, 000yrs BP).<br>The Fagus-dominated stage in the Post Glacial Period in this area suggests that Fagus crenata forest was formed and spread since about 10, 000yrs BP; the vegetation change reveals that this area has become a heavy snowfall area since the Post Glacial Period.
収録刊行物
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- 第四紀研究
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第四紀研究 40 (1), 1-17, 2001
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
- 1390282681472878464
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- NII論文ID
- 10007542866
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- NII書誌ID
- AN0034136X
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- ISSN
- 18818129
- 04182642
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- NDL書誌ID
- 5654967
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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
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- 使用不可