Grain-size characteristics of sediment in Daniugou peatland in Changbai Mountains,Northeast China: Implications for atmospheric dust deposition |
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Authors: | Kunshan Bao Lin Jia Xianguo Lu Guoping Wang |
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Institution: | [1]Key Laboratory of Wetland Ecology and Environment,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130012,China [2]Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China [3]Graduate University of the Chinese Academy of Sciences,Beijing 100049,China |
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Abstract: | The grain-size distribution characteristics and grain-size parameters of sediment in two vertical sections of Daniugou peatland
in the Changbai Mountains were systematically investigated. A comparative analysis of the sediment granularity using a discriminative
function with Hongyuan peat, red clay, loess-paleosol, fluvial deposit as well as lacustrine deposit was also conducted. It
turns out that the vertical section of Daniugou peat ash is primarily constituted by clay and silt particles, and the content
of sand is relatively small. Grain-size frequency curves generally show a single-peak modality while a bimodal pattern is
detected in the upper layer. The grain-size component and peak pattern of grain-size frequency curves also illustrate that
peat ash materials were transported to the peatland by long-range aeolian dust during the deposition process, while there
existed short-distance dust influence in peat deposition of the upper layer. Comparisons of grain-size parameters and the
discriminative Y-value of Daniugou peat ash with those of typical aeolian sediments show close similarities, suggesting the
possibility that atmospheric dust transport processes were involved in the accumulation of peat again. Moreover, the variations
of grain-size distribution suggest the local environmental deterioration which is just the driving force of local dust elevation.
Grain-size analysis of peatland sediment is demonstrated to be one effective method to extract information about regional
and global environmental evolution, and more attention should be paid to current local ecological environment and to seeking
a balance between economic development and environmental protection in Northeast China. |
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Keywords: | grain-size peatland aeolian sediment atmospheric dust deposition Changbai Mountains |
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