阿蘇カルデラ北部, 阿蘇谷千町無田ボーリングコアの植物珪酸体および微粒炭分析 Phytolith and Macroscopic Charcoal Analyses of the Senchomuta Drilling Core in Asodani Valley, Northern Part of Aso Caldera, Japan

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 Holocene environmental changes and vegetation history are constructed using phytolith and macroscopic-charcoal analyses of a 23-m-deep drilling core obtained at the Senchomuta marsh in Asodani Valley, northern part of Aso caldera, SW Japan. An intra-caldera lake existed in the Asodani Valley prior to approximately 9 cal ka (calibrated <sup>14</sup>C age). Multiple large flood events occurred during the period 8.9-8.1 cal ka and emplaced thick sandy deposits in the valley basin. Thereafter, the center of the Asodani Valley (northern part of caldera floor) changed to swampy and fluvial environments. <i>sasa</i> (cool-temperature dwarf bamboo) grasslands and/or forests with understory <i>sasa</i> covered slopes of the Asodani Valley basin between 11 and 9 cal ka. <i>sasa</i> phytoliths significantly increased at <i>ca</i>. 7.3-6.5 cal ka, but thereafter decreased. <i>Miscanthus</i> (Japanese pampas grass) grasslands existed continuously on the slopes. Macroscopic-charcoal particles were abundant during the last 6000 years, and the peak (6.1 cal ka) amount of charcoal particles is consistent with that of <i>Miscanthus</i> phytoliths. This indicates that the existence of <i>Miscanthus</i> grassland might be related to fire events. Inside the Asodani Valley, <i>Phragmites</i> (reed) became established continuously along the shore of the intra-caldera lake (prior to <i>ca</i>. 9 cal ka) and in subsequent marshes. Gramineae phytoliths were detected predominately through all horizons of the drilling core, whereas a small amount of arboreal phytolith was observed at most horizons. We, therefore, believe that forests existed on steep slopes such as the caldera wall where human impacts were small, although <i>sasa</i> and <i>Miscanthus</i> grasslands were maintained by human activity outside Aso caldera.

収録刊行物

  • 地學雜誌

    地學雜誌 119(1), 17-32, 2010-02-25

    公益社団法人 東京地学協会

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各種コード

  • NII論文ID(NAID)
    10030367885
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    10597236
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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