Seasonality change and the third millennium BP rainforest crisis in southern Cameroon (Central Africa)
Seasonality change and the third millennium BP rainforest crisis in southern Cameroon (Central Africa)
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喀麦隆南部(中非)的季节性变化和第三个千年 BP 雨林危机
DOI:
10.1016/j.yqres.2008.12.002
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发表时间:
2009
影响因子:
2.3
通讯作者:
J. Maley
中科院分区:
文献类型:
--
作者:
Ngomanda;K. Neumann;A. Schweizer ;J. Maley
The third millennium BP crisis of the central African rainforest is not sufficiently understood. The low resolution of most pollen profiles and a large plateau of the calibration curve aggravate the exact dating of the event, and its causal climatic parameters are debated. We present a high-resolution pollen profile from the swamp site Nyabessan in the southern Cameroonian rainforest, covering the period 3100-2300 cal yr BP. Between 3100 and 2500 cal yr BP, the climate was favourable for a regional evergreen forest with Caesalpiniaceae and Lophira and a local Raphia swamp forest. Around 2500/2400 cal yr BP, a significant decrease of mature forest and swamp forest taxa and an increase of pioneers indicate that the rain forest was seriously disturbed and replaced by secondary formations. The dominance of Trema orientalis, a pioneer well adapted to seasonal desiccation, points to a much more accentuated seasonality after 2500 cal yr BP, which seems to be linked to a southwards shift of the ITCZ during the northern hemisphere winter months. We propose that the rain forest crisis between 2500 and 2200 cal BP created favourable conditions for farming and paved the way for a major expansion of Bantu speaking populations.
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DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
M. Blaauw;G. Heuvelink;D. Mauquoy;J. Van Der Plicht;B. van Geel
通讯作者:
B. van Geel
影响因子:
3.4
作者:
Barend S. Van Gemerden;G. N. Shu;H. Olff
通讯作者:
H. Olff
DOI:
10.1017/s0021853700034101
发表时间:
1995-07
期刊:
The Journal of African History
影响因子:
--
作者:
J. Vansina
通讯作者:
J. Vansina
影响因子:
3.9
作者:
A. Vincens;D. Schwartz;H. Elenga;I. Reynaud;A. Alexandre;J. Bertaux;A. Mariotti;Louis Martin;J. Meunier;F. Nguetsop;M. Servant;S. Servant;D. Wirrmann
通讯作者:
D. Wirrmann
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
S. MacEachern;Tchago Bouimon;P. Lavachery;Bienvenu Gouem Gouem;Pierre Kinyock;Olivier Nkonkonda;Jean Mbairo
通讯作者:
Jean Mbairo