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A late Pleistocene and Holocene phytolith record, Lower Salmon River Canyon, Idaho.

机译:爱达荷州下萨蒙河峡谷的晚更新世和全新世植物石器记录。

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摘要

Phytolith analysis of two sediment exposures from the Lower Salmon River Canyon, Idaho, was carried out to provide a record of past vegetation. Six phytolith zones were defined, spanning full glacial time to the present.;The results are also compared to those of Davis (2001) in order to test the ‘Oasis effect’ hypothesis. This hypothesis suggests that riverine vegetation was stable from 9,000–2,000 BP which would have made the canyon bottoms a more attractive habitation for human settlement than the less stable plateaus and mountainous areas.;The phytolith record does not fully support the ‘Oasis effect’ because there was a steady shift in vegetation to a more restricted woodland component from 6,000 BP to the present as well as an increasing presence of mesic vegetation that peaked by 3,500 BP.
机译:对爱达荷州下鲑鱼河峡谷的两次沉积物暴露进行了植石分析,以提供过去的植被记录。定义了六个硅藻土带,跨越了整个冰川期。并将结果与​​Davis(2001)的结果进行比较,以检验“绿洲效应”假设。该假说表明,河床植被在9,000–2,000 BP范围内是稳定的,这将使峡谷底部比不稳定的高原和山区成为更适合人类居住的栖息地。;植石体记录不能完全支持“绿洲效应”,因为从6,000 BP到目前,植被一直在向更受限制的林地成分转变,而中生植被的增加也达到了3500 BP的峰值。

著录项

  • 作者

    Somer, Bradley Fraser.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Paleobotany.
  • 学位 M.A.
  • 年度 2003
  • 页码 173 p.
  • 总页数 173
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 关键词

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