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首页> 外文期刊>Limnology >Paleoenvironmental changes in northwest Mongolia during the last 27 kyr inferred from organic components in the Lake Hovsgol sediment core record
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Paleoenvironmental changes in northwest Mongolia during the last 27 kyr inferred from organic components in the Lake Hovsgol sediment core record

机译：根据Hovsgol湖沉积物核心记录中的有机成分推断，在过去27年中，蒙古西北部的古环境变化

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摘要

We studied organic components in the X106 sediment core (length 130.3 cm, water depth 236 m, 50°53′01″N, 100°21′22″E) from Lake Hovsgol to elucidate the biological production, source of organic components, and paleoenvironmental and paleolimnological changes during the last 27 kyr in northwest Mongolia. Total organic carbon (TOC) contents (0.20–0.70%) in the core of the last glacial period increased dramatically and attained 3.16–5.85% in the postglacial period (Holocene), together with the increase of the contribution of terrestrial organic matter. Biological production (both terrestrial and aquatic production) based on the TOC contents in the Holocene was 14 times higher than that in the last glacial period. The Bølling-Allerød warm period and Younger Dryas cool period were both observed at depths of 55–50 cm (ca. 15–13 cal kyr BP) and 50–45 cm (ca. 13–11 cal kyr BP), respectively. We propose here a terrestrial/aquatic index (TAI) for organic matter in lake sediments. The TAI values suggest that terrestrial organic matter in the bottom of the core was less than 10%, increased to 48% in the Bølling-Allerød warm period, decreased abruptly to 20% in the Younger Dryas cool period, and again increased to 30–40% in the Holocene. Normal-C31 alkane (a biomarker of herbaceous land plants) and n-C18 alkanoic acid (marker of plankton) decreased from the last glacial period to the Holocene, whereas n-C23 alkane and n-C22 alkanoic acid (a marker of higher vascular plants) increased from the last glacial period to the Holocene. Scarce herbaceous plant vegetation, such as Artemisia spp. of the lake basin in the last glacial period, changed into an abundance of higher woody plant vegetation (e.g., Pinus spp., Betula spp. and/or Larix spp.) in the Holocene. Stanol/sterol ratios suggest that relatively high oxygen tension of the lake bottom in ca. 27–22 cal kyr BP decreased from this age to the present, though benthic organisms are still abundant.
机译：我们研究了Hovsgol湖X106沉积物岩心中的有机成分（长130.3厘米，水深236 m，50°53′01″ N，100°21′22″ E），以阐明生物生产，有机成分的来源和蒙古西北部近27年以来的古环境和古气候变化。上一个冰川期核心的总有机碳（TOC）含量（0.20–0.70％）急剧增加，后冰期（全新世）达到3.16-5.85％，同时陆地有机物的贡献也增加了。基于全新世中TOC含量的生物产量（陆地和水生产量）比上一个冰期高14倍。 Bølling-Allerød温暖期和Younger Dryas较凉期分别在55–50 cm（约15-13 cal yr BP）和50–45 cm（约13-11 cal yr BP）的深度观察到。我们在此提出湖泊沉积物中有机物的陆地/水生指数（TAI）。 TAI值表明，核心底部的陆地有机物少于10％，在Bølling-Allerød温暖期增加到48％，在Younger Dryas凉爽时期突然减少到20％，然后又增加到30– 40％的全新世。从上一个冰期到全新世，正C31 烷烃（一种草本陆生植物的生物标志物）和n-C18 烷酸（浮游生物的标志物）减少，而正C23 烷烃从最后一个冰期到全新世，n-C22 链烷酸（高级维管植物的标志物）增加。稀少的草本植物植被，例如艾蒿。上个冰川期的湖盆区域变成了全新世的大量木本植物植被（例如松属，桦木和/或落叶松）。甾烷醇/甾醇的比率表明，湖底的氧张力较高。尽管底栖生物仍然丰富，但从这个年龄到现在，27-22 cal kyr BP下降了。

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  • 来源
    《Limnology》 |2012年第1期|p.55-63|共9页
  • 作者

    Genki I. Matsumoto; Ryoko Kanou; Chika Sato; Kazuho Horiuchi; Takayoshi Kawai;

  • 作者单位

    Department of Environmental Studies, School of Social Information Studies, Otsuma Women’s University, 2-7-1 Karakida, Tama, Tokyo, 206-8540, Japan;

    Department of Environmental Studies, School of Social Information Studies, Otsuma Women’s University, 2-7-1 Karakida, Tama, Tokyo, 206-8540, Japan;

    Department of Environmental Studies, School of Social Information Studies, Otsuma Women’s University, 2-7-1 Karakida, Tama, Tokyo, 206-8540, Japan;

    Department of Earth and Environmental Sciences, Faculty of Science and Technology, Hirosaki University, Bunkyo-cho, Hirosaki, Aomori, 036-8561, Japan;

    Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lake Hovsgol; Sediment core; Organic components; Paleoenvironmental change; Paleolimnological change;

    机译：霍夫斯高尔湖;沉积物核心;有机成分;古环境变化;古湖泊学变化;

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