Arid
DOI10.1177/0959683612463102
Phytolith taphonomy in the middle- to late-Holocene fluvial sediments of Ounjougou (Mali, West Africa)
Garnier, Aline1; Neumann, Katharina2; Eichhorn, Barbara2; Lespez, Laurent1
通讯作者Garnier, Aline
来源期刊HOLOCENE
ISSN0959-6836
EISSN1477-0911
出版年2013
卷号23期号:3页码:416-431
英文摘要

In semi-arid ecosystems where lacustrine sediments are rare, bio-proxies preserved in fluvial deposits are needed to understand environmental changes. In this study, we evaluate the potential of phytoliths as a bio-proxy in the Yame River’s deposits at Ounjougou (Mali, West Africa) covering the middle to late Holocene (7790-4000 cal. BP). In soils, phytolith assemblages result mainly from decomposition of local vegetation but in alluvial deposits, the taphonomy of phytoliths is more complex, depending on the type of transport and deposition. In order to define the spatial origin of the phytolith assemblages, either from local (valley floor) or regional vegetation (catchment area), we took the sedimentary characteristics of the deposits into account. Using a combination of general and index approaches, phytoliths of 14 modern and 29 fossil samples from the Yame valley were analyzed. The predominant source area of represented phytoliths varies with the fluvial energy of transport. Channel deposits, carried during periods of strong fluvial activity, contain higher numbers of savanna grass phytoliths and display a lower ratio of dicotyledon versus Poaceae phytoliths (D/P) than those deposited in the floodplain where phytoliths from the local gallery forest are more strongly represented. From the 5th millennium BP onwards, higher percentages of grass short cell phytoliths (GSCP) and lower D/P values point to gradual vegetation opening due to increasing aridity. High amounts of burned phytoliths show regular fire incidence in the gallery forest and attest for human impact on the landscapes of Ounjougou from the 7th millennium BP onwards. After 4500 cal. BP, there is evidence for pearl millet cultivation.


英文关键词fluvial deposits middle to late Holocene phytoliths spatial vegetation reconstruction taphonomy West African Sahel
类型Article
语种英语
国家France ; Germany
收录类别SCI-E
WOS记录号WOS:000316635400009
WOS关键词LAST GLACIAL MAXIMUM ; INTERTROPICAL AFRICA ; GRASSLAND DYNAMICS ; NORTHEAST NIGERIA ; LATE PLEISTOCENE ; TROPICAL AFRICA ; OLDUVAI GORGE ; LAKE BOSUMTWI ; GREAT-PLAINS ; CLIMATE
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/177474
作者单位1.Univ Caen Basse Normandie, Lab LETG Caen Geophen UMR CNRS 6554, F-14032 Caen, France;
2.Goethe Univ Frankfurt, Inst Archaeol Sci, Frankfurt, Germany
推荐引用方式
GB/T 7714
Garnier, Aline,Neumann, Katharina,Eichhorn, Barbara,et al. Phytolith taphonomy in the middle- to late-Holocene fluvial sediments of Ounjougou (Mali, West Africa)[J],2013,23(3):416-431.
APA Garnier, Aline,Neumann, Katharina,Eichhorn, Barbara,&Lespez, Laurent.(2013).Phytolith taphonomy in the middle- to late-Holocene fluvial sediments of Ounjougou (Mali, West Africa).HOLOCENE,23(3),416-431.
MLA Garnier, Aline,et al."Phytolith taphonomy in the middle- to late-Holocene fluvial sediments of Ounjougou (Mali, West Africa)".HOLOCENE 23.3(2013):416-431.
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