globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.12.025
论文题名:
Late Pleistocene glacial forest of Humaitá-Western Amazonia
作者: Cohen M.C.L.; Rossetti D.F.; Pessenda L.C.R.; Friaes Y.S.; Oliveira P.E.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 415
起始页码: 37
结束页码: 47
语种: 英语
英文关键词: Alnus ; Brazilian Amazonia ; C isotope ; Last Glacial Maximum ; Palynology ; Sedimentary facies
英文摘要: Glacial-aged vegetation dynamics of the Humaitá-Western Brazilian Amazonia were studied by pollen, sedimentary facies, 14C dating, δ13Corg and C/Nmolar. Two sediment cores were taken to a depth of 10 and 8m from areas covered by grassland and dense/open forest, respectively. The deposits represent a succession of sediment accumulation in active channel (>42,600cal yr B.P.), abandoned channel/floodplain (>42,600 to ~39,000cal yr B.P.), and oxbow lake sedimentary environments (~39,000cal yr B.P. to modern). The predominance of mud sediments, depletion of δ13Corg and decrease in C/Nmolar values identify the lake establishment. In these settings, low energy subaqueous conditions were developed, locally favoring preservation of a pollen assemblage representing herbaceous vegetation, some modern taxa from Amazonia and cold-adapted plants from the Andes represented by Alnus (2-11%), Hedyosmum (2-17%), Weinmannia (0-18%), Podocarpus (0-4%), Ilex (0-4%) and Drymis (0-1%), at least between >42,600 and <35,200cal yr B.P. The herbs and modern taxa from Amazonia persisted through the Holocene, while the cold pollen assemblage became absent. The co-occurrence of Alnus with other cold adapted plants from the Andes during the late Pleistocene indicates that Alnus probably penetrated the Western Amazonia lowland or was growing closer to the study site due to cooler temperatures during glacial times. The present study presents the first report of a glacial age forest containing Alnus in areas of the Brazilian Amazonian lowlands. In addition to its palaeogeographical importance, this work demonstrates the effectiveness of using a combination of proxies for reconstructing sedimentary environments associated with vegetation. © 2014 Elsevier B.V. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69164
Appears in Collections:过去全球变化的重建

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作者单位: Post-Graduate Program of Geology and Geochemistry, Laboratory of Coastal Dynamics, Federal University of Pará, Avenida Perimentral 2651, Terra Firme, Belém, PA, Brazil; Faculty of Oceanography, Federal University of Pará, Rua Augusto Corrêa 1, Guama, Belém, PA, Brazil; National Space Research Institute (INPE), Rua dos Astronautas 1758-CP 515, São José dos Campos, SP, Brazil; Center for Nuclear Energy in Agriculture (CENA), University of São Paulo, Piracicaba, São Paulo, Brazil; São Francisco University, Av. São Francisco de Assis, 218, Jd. São Jose, Bragança Paulista, SP, Brazil

Recommended Citation:
Cohen M.C.L.,Rossetti D.F.,Pessenda L.C.R.,et al. Late Pleistocene glacial forest of Humaitá-Western Amazonia[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,415
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