Late Quaternary vegetation and climate change in the Amazon basin based on a 50,000 year pollen record from the Amazon fan, ODP site 932

被引:158
作者
Haberle, SG [3 ]
Maslin, MA
机构
[1] Smithsonian Trop Res Inst, Balboa, Panama
[2] UCL, Dept Geog, Environm Change Res Ctr, London WC1H 0AP, England
[3] Monash Univ, Dept Geog & Environm Sci, Clayton, Vic 3168, Australia
基金
美国国家科学基金会; 英国自然环境研究理事会;
关键词
palynology; oxygen isotopes; tropical forest; last glacial maximum; Amazon River; Amazon Fan;
D O I
10.1006/qres.1998.2020
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Hemipelagic sediments from the Amazon deep-sea fan, ODP Site 932 (5 degrees 12.7'N, 47 degrees 1.8'W), and continental shelf provide a 50,000-yr-long pollen record of Amazon Basin vegetation. The age model for Hole 932A is constrained by eight magnetic remanence intensity features, one paleomagnetic excursion, and three AMS (14)C dates. Alchornea, Melastomataceae, Myrtaceae, and Moraceae/Urticaceae are dominant taxa in the pollen record between 40,200 and 19,800 cal yr B.P. Andean taxa, such as Podocarpus and Hedyosmum, increase in abundance between 19,800 and 11,000 cal yr B.P, and prior to 40,200 cal yr B.P. The Holocene pollen assemblage, derived from Amazon River and continental shelf sediments, is dominated by secondary growth taxa, such as Cecropia. Climatic factors influencing the development of glacial and interglacial tropical vegetation are considered by comparing marine with terrestrial records of vegetation change. This comparison shows that the Amazon Basin forests were not extensively replaced by savanna vegetation during the glacial period, contradicting the refugia hypothesis. (C) 1999 University of Washington.
引用
收藏
页码:27 / 38
页数:12
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