globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.08.021
Scopus记录号: 2-s2.0-85028050194
论文题名:
Paleoenvironmental dynamics in South Amazonia, Brazil, during the last 35,000 years inferred from pollen and geochemical records of Lago do Saci
作者: Fontes D.; Cordeiro R.C.; Martins G.S.; Behling H.; Turcq B.; Sifeddine A.; Seoane J.C.S.; Moreira L.S.; Rodrigues R.A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 173
起始页码: 161
结束页码: 180
语种: 英语
英文关键词: Geochemical proxies ; Holocene ; Last glacial maximum ; Paleoenvironment ; Pollen ; South Amazonia
Scopus关键词: Carbon ; Expansion ; Floods ; Forestry ; Geochemistry ; Lakes ; Amazonia ; Geochemical proxies ; Holocenes ; Last Glacial Maximum ; Paleo-environment ; Pollen ; Organic carbon ; Celtis ; Ilex ; Podocarpus ; Sagittaria
英文摘要: Paleoenvironmental changes for the last 35,000 years were reconstructed from palynological, sedimentological and organic geochemical evidence from a well-dated sediment core from Lago do Saci (South Amazonia). Dry climatic conditions occurred between 35,000 and 18,200 cal yr BP as recorded by high frequencies of open savanna taxa and low lake level indicated by Sagittaria and low Total Organic Carbon content. Cold temperatures are indicated by the presence of Podocarpus and Ilex. A sedimentation hiatus observed between 18,200 and 9200 cal yr BP was likely related to dry conditions. The beginning of the Holocene was marked by rainforest expansion and an increase in carbon content that represented high lake levels and warmer and wetter climate conditions. Between 7500 and 5000 cal yr BP, the expansion of open savanna, seasonal forest elements and abundant black carbon suggests a dry phase. After 5000 cal yr BP, rainforest expansion and higher lake levels indicate a return to wetter conditions. A reduction of flooding taxa (Celtis and Mauritia) between 1800 and 1300 cal yr BP, high lake level conditions and maintenance of a forest physiognomy, suggests a decrease of regional precipitation and subsequent reduction of the flooded areas in a still humid climate regime. © 2017
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59097
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作者单位: Programa de Geoquímica, Universidade Federal Fluminense, Outeiro de São João, s/n, Niterói, RJ, Brazil; Department of Palynology and Climate Dynamics, Georg-August-University of Göttingen, Untere Karspüle 2, Göttingen, Germany; IRD-Sorbonne Universités (UPMC, Univ Paris 06)-CNRS-MNHN, LOCEAN Laboratory, France; LMI PALEOTRACES (IRD, UPMC, UFF, Uantof, UPCH), Departamento de Geoquímica, UFF, Brazil; Instituto de Geologia (IGEO), Universidade Federal do Rio de Janeiro, Av. Athos da Silveira 274, Rio de Janeiro, Brazil; Empresa Brasileira de Pesquisa Agropecuária, Embrapa Solos, R. Jardim Botânico, 1024 - Jardim Botânico, Rio de Janeiro, RJ, Brazil

Recommended Citation:
Fontes D.,Cordeiro R.C.,Martins G.S.,et al. Paleoenvironmental dynamics in South Amazonia, Brazil, during the last 35,000 years inferred from pollen and geochemical records of Lago do Saci[J]. Quaternary Science Reviews,2017-01-01,173
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