Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/S0031-0182(97)00089-8 |
Phytoliths: indicators of grassland dynamics during the late Holocene in intertropical Africa | |
Alexandre, A; Meunier, JD; Lezine, AM; Vincens, A; Schwartz, D | |
通讯作者 | Alexandre, A |
来源期刊 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
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ISSN | 0031-0182 |
出版年 | 1997 |
卷号 | 136期号:1-4页码:213-229 |
英文摘要 | The reconstruction of African tropical grassland history during the late Holocene can be carried out using phytolith analysis. Fossil phytolith assemblages from Lake Guiers, in the Sahelian region of Senegal, and from Lake Sinnda, in the Guineo-Congolian region of Congo were investigated. The results are interpreted on the basis of modern phytolith assemblages from the same regions and compared to pollen data previously obtained. Tall or short grass associations are discriminated by their phytolith index Iph(%)=saddle/(cross + dumbel + saddle), while the density of shrubs and trees is indicated by relative proportions of the dicotyledon phytoliths. The phytolith data emphasize that, in the Guineo-Congolian region around Lake Sinnda, the driest phase of the late Holocene occurred between 4000 and 1200 yr B.P., commencing with the opening of the dense forest and its replacement by a short grass savanna. From ca. 1000 yr B.P., wetter climatic conditions developed, as represented by the setting up of a tall grass savanna woodland. The modern shrub and tall grass savanna was developed ca. 700 yr B.P. In the Sahelian region around Lake Guiers, the driest phase occurred after about 2000 yr B.P. and has not been followed by moister conditions. A tall grass savanna woodland was gradually replaced by a shrub and short grass savanna which still occurs. A short period of development of swampy vegetation, which can be related to a lake level change, interrupted the semi-arid adaptation of the vegetation, between about 2000 yr B.P. and the present. (C) 1997 Elsevier Science B.V. |
英文关键词 | phytoliths tracers paleoenvironment Holocene savannas |
类型 | Article |
语种 | 英语 |
国家 | FRANCE |
收录类别 | SCI-E |
WOS记录号 | WOS:A1997YL24100013 |
WOS关键词 | LATE QUATERNARY VEGETATION ; POLLEN EVIDENCE ; OPAL PHYTOLITHS ; EASTERN SAHARA ; LAKE BOSUMTWI ; CLIMATE ; SAHEL ; CONGO ; SEDIMENTS ; CHARCOAL |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology |
WOS研究方向 | Physical Geography ; Geology ; Paleontology |
来源机构 | French National Research Institute for Sustainable Development |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/134900 |
作者单位 | (1)UNIV PARIS 06,CNRS,URA 1761,F-75252 PARIS 5,FRANCE;(2)CEREG,ORSTOM,DS,CNRS,URA 95,F-67083 STRASBOURG,FRANCE |
推荐引用方式 GB/T 7714 | Alexandre, A,Meunier, JD,Lezine, AM,et al. Phytoliths: indicators of grassland dynamics during the late Holocene in intertropical Africa[J]. French National Research Institute for Sustainable Development,1997,136(1-4):213-229. |
APA | Alexandre, A,Meunier, JD,Lezine, AM,Vincens, A,&Schwartz, D.(1997).Phytoliths: indicators of grassland dynamics during the late Holocene in intertropical Africa.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,136(1-4),213-229. |
MLA | Alexandre, A,et al."Phytoliths: indicators of grassland dynamics during the late Holocene in intertropical Africa".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 136.1-4(1997):213-229. |
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