globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.10.009
论文题名:
Forests of the tropical eastern Andean flank during the middle Pleistocene
作者: Cárdenas M.L.; Gosling W.D.; Pennington R.T.; Poole I.; Sherlock S.C.; Mothes P.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 393
起始页码: 76
结束页码: 89
语种: 英语
英文关键词: Amazon ; Ecuador ; Fire ; Neotropics ; No analogue ; Pollen ; Woodland
英文摘要: Inter-bedded volcanic and organic sediments from Erazo (Ecuador) indicate the presence of four different forest assemblages on the eastern Andean flank during the middle Pleistocene. Radiometric dates (40Ar-39Ar) obtained from the volcanic ash indicate that deposition occurred between 620,000 and 192,000years ago. Examination of the organic sediment composition and the fossil pollen, wood and charcoal it contains provides insight into depositional environment, vegetation assemblage and fire history. The high organic content and abundance of macro fossils found throughout the sediment suggest that during the period of deposition the local environment was either a swamp or a shallow water body. The correlation of fire activity (peaks in charcoal abundance) with volcanic ash deposits through most of the record suggests that volcanoes were the main source of ignition. The low abundance of grass (typically <10%) throughout the sedimentary sequence along with the low abundance of other taxa indicative of open vegetation suggests the persistence of forest at Erazo. Four types of forest assemblage were identified (with the first taxa as the most dominant): i) Alnus-Arecaceae, ii) Miconia-Melastomataceae/Combretaceae-Moraceae/Urticaceae, iii) Arecaceae-Alnus, and iv) Podocarpus with Oreopanax sp. and Melastomataceae/Combretaceae. Changes in the forest floristic composition indicate high vegetation turnover and reassortment of taxa between upper and lower montane forests during the middle Pleistocene as well as the persistence of forest cover. © 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/69498
Appears in Collections:过去全球变化的重建

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作者单位: Department of Environment, Earth and Ecosystems, Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR), The Open University, Walton Hall, Milton Keynes MK7 6AA, United Kingdom; Tropical Biology Group, Royal Botanic Garden, Edinburgh, 20a Inverleith Row, Edinburgh EH3 5LR, United Kingdom; Department of Geology and Petroleum Geology, University of Aberdeen, King's College, Meston Building, Aberdeen AB24 3UE, United Kingdom; Instituto Geofísico, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, Apartado 2759, Quito, Ecuador

Recommended Citation:
Cárdenas M.L.,Gosling W.D.,Pennington R.T.,et al. Forests of the tropical eastern Andean flank during the middle Pleistocene[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,393
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