NUMERICAL INTERPRETATION OF A HIGH-RESOLUTION HOLOCENE POLLEN RECORD FROM BURUNDI

被引:31
作者
JOLLY, D [1 ]
BONNEFILLE, R [1 ]
ROUX, M [1 ]
机构
[1] FAC SCI & TECH ST JEROME,BIOMATH LAB,SERV 462,F-13397 MARSEILLE 13,FRANCE
关键词
D O I
10.1016/0031-0182(94)90185-6
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
The Holocene history of the tropical montane forest is reconstructed using a high resolution pollen record from a valley swamp (3-degrees-35'S, 29-degrees-41'E), at 2000 m elevation. The post-glacial establishment of the montane rain forest is evidenced at ca. 10,600 yr B.P. Numerical analysis combines the Correspondence Analysis with the Cluster Analysis of both 38 modern and 101 fossil pollen spectra including 125 identified pollen taxa. Four distinct successionnal stages of forest development have been identified. The past vegetation recorded during the early Holocene period (10,600-3800 yr B.P.) was more closely related to modern pollen spectra from secondary forest rather than to primary forest samples from Burundi. At 3800 yr B.P., a sharp decrease of arboreal pollen percentages and a noticeable increase of Celtis, a semi-deciduous tree indicate the opening of montane forest due to a drier climatic event. The beginning of the anthropogenic impact evidenced later at 3500 yr B.P., contemporaneously with the Early Iron Age in Burundi, follows the late Holocene climatic shift.
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页码:357 / 370
页数:14
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