DOI: 10.1016/j.palaeo.2014.03.019
论文题名: Holocene palynology and palaeoenvironments in the Savanna Biome at Tswaing Crater, central South Africa
作者: Metwally A.A. ; Scott L. ; Neumann F.H. ; Bamford M.K. ; Oberhänsli H.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 402 起始页码: 125
结束页码: 135
语种: 英语
英文关键词: Climate change
; Fire history
; Lake deposits
; Pollen
; Subtropical woodland
英文摘要: A radiocarbon dated pollen and microscopic charred particle record from the Holocene section of the Tswaing Crater in the Savanna Biome of South Africa give new evidence for environmental changes during the period c. 9400-1800. cal. years BP. Pollen grains are scarce or absent in layers dating from before 9400. cal. years BP but deposits rich in pollen occur in overlying layers. The section dated between 9400. cal. years BP and c. 7200. cal. years BP contains grass, Asteraceae and dry savanna pollen types that suggest fluctuating but generally dry moisture conditions. Later between c. 7200 and 1800. cal. years BP, broad leaved savanna woodland elements and local swamp pollen indicate relatively stable vegetation and wetter mildly fluctuating climatic conditions, which is consistent with previously published biomarker analysis. Between c. 6200 and 5500. cal. years BP, the numbers of charred particles increased slightly. This indicates burning activity, which can probably be attributed to dry season ignition of denser fuel under relatively moist conditions. A decrease of local swamp pollen between c. 3600 and 3500. cal. years BP suggests that conditions became briefly drier again as pollen of woody elements declined in favour of open grassland pollen. A comparison between the Tswaing pollen profile and various other sequences within the central interior of South Africa suggests generally similar conditions over the central interior of the sub-continent during the Holocene deviating from sequences further afield along the coastal areas of southern Africa. Between 9400. cal. years BP and ca. 7200. cal. years BP, the western and southern coasts were probably controlled by different atmospheric and oceanic circulation regimes under the influence of a strong westerly winter-rain system while the north-eastern area where, Tswaing is situated, experienced weaker precession and less summer rain from the Intertropical Convergence Zone. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69362
Appears in Collections: 过去全球变化的重建
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作者单位: Bernard Price Institute for Palaeontology, Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, Wits 2050 Johannesburg, South Africa; Geology Department, Faculty of Science, Assiut University, Assiut 71516, Egypt; Department of Plant Sciences, University of the Free State, Bloemfontein 9300, South Africa; Forschungsstelle für Paläobotanik, Heisenbergstrasse 2, 48149, 48143 Münster, Germany; GeoForschungsZentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany; Museum of Natural History Berlin, Leibniz-Institute, Invalidenstrasse 43, D-10115 Berlin, Germany
Recommended Citation:
Metwally A.A.,Scott L.,Neumann F.H.,et al. Holocene palynology and palaeoenvironments in the Savanna Biome at Tswaing Crater, central South Africa[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,402