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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Holocene palaeoenvironments inferred from a sedimentary sequence in the Tsoaing River Basin, western Lesotho.
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Holocene palaeoenvironments inferred from a sedimentary sequence in the Tsoaing River Basin, western Lesotho.

机译：从莱索托西部Tsoaing流域的沉积序列推断出全新世古环境。

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摘要

The paper presents a sedimentological, palynological, and phytolith record from a 13 m deep Holocene sedimentary sequence, located in the Tsoaing River valley, southwestern Lesotho. Six conventional radiocarbon and two AMS dates provide a relatively high resolution Holocene record for the sedimentary sequence, ranging from ca. 12 000 to 4000 years BP. Pollen is absent in the upper section but present in the lower 2 m, confirming terminal Pleistocene/Holocene conditions reported in previous published pollen and charcoal records from the region. The absence of pollen in the upper layers of ca. 9000 years BP and younger suggests that conditions over southwestern Lesotho throughout much of the Holocene was typified by a seasonal climate that prevented long-term preservation of plant remains, although other plant material like robust spores, microscopic charcoal, and phytoliths withstood oxidation. Sedimentological and phytolith results suggest that the period from ca. 8600 to 8450 years BP experienced rapid environmental change towards drier conditions. Phases of chemical disintegration with organic input (including local swamp phytoliths) are suggested at ca. 7000 years BP and again after 4500 years BP..
机译：这篇论文介绍了位于莱索托西南部Tsoaing河流域深13 m的全新世沉积序列的沉积学，孢粉学和植硅体记录。六个常规的放射性碳和两个AMS日期为沉积序列提供了相对高分辨率的全新世记录，范围约为。 BP 12000至4000年。上部没有花粉，但在下部2 m内有花粉，这证实了该地区先前公布的花粉和木炭记录中所报告的更新世/全新世末期情况。在ca的上层中没有花粉。 9000年及BP以下的研究表明，整个全新世大部分时间都在莱索托西南部的条件下，表现为季节性气候，阻止了植物残骸的长期保存，尽管其他植物材料（如健壮的孢子，细微的木炭和植石也可以抵御氧化）。沉积学和植石学结果表明该时期从大约8600至8450年间，BP经历了朝着干燥条件迅速变化的环境。建议在有机分解过程中使用有机物（包括局部沼泽藻类）分解。 7000年BP，再过4500年BP ..

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