globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.07.009
论文题名:
A high resolution 15,600-year pollen and microcharcoal record from the Cederberg Mountains, South Africa
作者: Valsecchi V.; Chase B.M.; Slingsby J.A.; Carr A.S.; Quick L.J.; Meadows M.E.; Cheddadi R.; Reimer P.J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 387
起始页码: 6
结束页码: 16
语种: 英语
英文关键词: Fynbos Biome ; Late Quaternary ; Microcharcoal ; Pollen ; Rock hyrax middens ; South Africa
英文摘要: The Cederberg Mountains (Western Cape Province, South Africa) are located within the Fynbos Biome, which exhibits some of the highest levels of species richness and endemism in the world. The region's post-glacial vegetation history, however, remains largely unknown. Presented here are high resolution pollen and microcharcoal records spanning the last 15,600. years obtained from the De Rif rock hyrax midden from the Driehoek Valley of the central Cederberg. In this region, previous pollen studies have shown muted variability in vegetation community composition during periods of globally marked climatic variability (e.g. the last glacial-interglacial transition). In our record, however, significant changes in vegetation composition are apparent. Most notably, they indicate a shift from ericaceous/restioid fynbos (present from 15,600 to 13,300. cal. yr BP) to a brief, but prominent, development of proteoid fynbos at the beginning of the Holocene around 11,200. cal. yr BP. This vegetation shift is associated with increased moisture at the site, and coincides with reduced fire frequency as indicated by the microcharcoal record. At 10,400. cal. yr BP, there is a marked reduction in Protea-type pollen, which is replaced by thicket, characterised by Dodonaea, which became the dominant arboreal pollen type. This shift was likely the result of a long relatively fire-free period coupled with warmer and wetter climates spanning much of the early Holocene. A brief but marked decrease in water availability around 8500-8000. cal. yr BP resulted in the strong decrease of Dodonaea pollen. The vegetation of the mid- to late Holocene is characterised by the increased occurrence of Asteraceae and succulent taxa, suggesting substantially drier conditions. These data give unprecedented insight into the vegetation dynamics across a period of substantial, rapid climate change, and while they confirm the presence of fynbos elements throughout the last 15,600. years, the results highlight significant fluctuations in the vegetation that were triggered by changes in both climate and fire regimes. © 2013 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69708
Appears in Collections:过去全球变化的重建

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作者单位: Institut des Sciences de l'Evolution de Montpellier, UMR 5554, Centre National de Recherche Scientifique/Université Montpellier 2, Bat.22, CC061, Place Eugène Bataillon, 34095 Montpellier, cedex5, France; Department of Archaeology, History, Culture and Religion, University of Bergen, Postbox 7805, 5020 Bergen, Norway; ZAFn Environmental Observation Network, Fynbos Node, Private Bag X7, Rhodes Drive, 7735, Newlands, South Africa; Department of Biological Sciences, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa; Department of Geography, University of Leicester, Leicester LE1 7RH, United Kingdom; Department of Environmental and Geographical Science, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa; School of Geography, Archaeology and Palaeoecology, Queen's University Belfast, Belfast, BT7 1NN, Northern Ireland, United Kingdom

Recommended Citation:
Valsecchi V.,Chase B.M.,Slingsby J.A.,et al. A high resolution 15,600-year pollen and microcharcoal record from the Cederberg Mountains, South Africa[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,387
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