Over-representation of Picea pollen induced by water transport in arid regions
Over-representation of Picea pollen induced by water transport in arid regions
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DOI：
10.1016/j.quaint.2012.11.026
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发表时间：
2013-06
影响因子：
2.2
通讯作者：
Fuli Wu;X. Fang;Congrong An;M. Herrmann;Yan Zhao;Y. Miao
中科院分区：
文献类型：
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作者：
Fuli Wu;X. Fang;Congrong An;M. Herrmann;Yan Zhao;Y. Miao
云杉花粉在重建冷湿气候或古海拔方面具有重要作用。然而，研究尚未考虑到干旱地区河流中的花粉运输途径。对祁连山黑河和石羊河表层沉积物和表层土壤的孢粉分析表明，两种沉积物中云杉属植物的花粉含量存在显著差异。在表层土壤中，云杉属花粉组分较低，代表风的运输。然而，云杉花粉的百分比达到15.9%的总花粉计数在地表河流沉积物，远至约120公里，从较低的云杉林线。这一结果，再加上所证明的云杉花粉在位于沿着那些观察到的河流的水体中的富集，表明河流和湖泊沉积物中的过度代表性。这些关系的知识为古植被、古气候或古海拔的重建提供了基础信息。
Picea pollen plays an important role for reconstructing a cold-humid climate or palaeo-elevations. However, research has not yet taken into account the pollen transportation pathways within rivers in arid regions. A sporopollen study of surface (the uppermost) river sediments and surface soils from the Heihe and Shiyang Rivers (originating in the Qilian Mountains) suggests that significant differences exist between Picea pollen percentages within these two different sediment types. In surface soils the Picea pollen fractions are low, representing transportation by wind. However, percentages of Picea pollen reach up to 15.9% of total pollen counts in surface river sediments, as far as about 120 km away from the lower spruce forest line. This result, together with the demonstrated enrichment of Picea pollen in water bodies that lie along those observed rivers, indicate an over-representation within fluvial and lacustrine sediments. Knowledge about these relationships provides fundamental information for the reconstruction of palaeo-vegetation, palaeo-climate or palaeo-elevations.