Late Holocene Climatic Changes in Western Equatorial Africa Inferred from Pollen from Lake Sinnda, Southern Congo

1998 ◽  
Vol 50 (1) ◽  
pp. 34-45 ◽  
Author(s):  
Annie Vincens ◽  
Dominique Schwartz ◽  
Jacques Bertaux ◽  
Hilaire Elenga ◽  
Christian de Namur
Keyword(s):  
Late Holocene ◽  
Major Change ◽  
Abrupt Decrease ◽  
Paleoclimatic Reconstruction ◽  
The Past ◽  
Equatorial Africa ◽  
History Of Vegetation ◽  
Drying Up ◽  
History Of ◽  
Vegetation And Climate

Pollen analysis of two cores from the Lake Sinnda, located in one of the driest areas of the southern Congo, reveals a history of vegetation and climate in this region during the past 5000 yr. A major change centered around 3000–2500 yr B.P. is indicated by an abrupt decrease in forest pollen and by a corresponding increase in grassland pollen. Concurrent drying up of the lake shows that climate, in particular aridity, was the major cause of this change. This paleoclimatic reconstruction conforms with evidence for drier conditions in other parts of western equatorial Africa, such as the development of isolated enclosed savannas and of heliophilous forested formations. The aridity is recorded more fully at Lake Sinnda than at the previous studied ones. It probably lasted longer, from 4200 to 1300 yr B.P., and was more progressive than previously inferred. The aridity predates agriculture marked by pollen of the oil palm at Lake Sinnda.

Histoire de la végétation et du climat de l’Afrique nord-tropicale au Quaternaire recent*

Bothalia ◽  
1983 ◽  
Vol 14 (3/4) ◽  
pp. 377-389 ◽  
Author(s):  
J. Maley
Keyword(s):  
Late Quaternary ◽  
Major Change ◽  
Important Change ◽  
Critical Examination ◽  
Tropical Zone ◽  
History Of Vegetation ◽  
History Of ◽  
Quaternary History ◽  
Vegetation And Climate ◽  
Qualitative Changes

LATE QUATERNARY HISTORY OF VEGETATION AND CLIMATE OF TROPICAL NORTH AFRICAThe critical examination o f available pollen data from the vegetation of the Sahara allows one to conclude that this vegetation has gone through but few qualitative changes during the last twenty thousand years. In particular, one notices an extension in the Sahara of tropical Sahel taxa about the middle of Holocene. Quantitatively, some pollen and geological data converge to Show that the Saharian plains were extremely arid between about 20 000 and 15 000 years BP and that on the mountains the vegetation became very sparse. A new colonization began on the mountains about 15 000 years ago.The pollen study of Holocene sediments from the central part o f the Chad basin was done in the Tjéri station. The results of this study exhibit a major change near 7 000 years BP, characterized in the Sahel zone by a dramatic extension o f arboreal taxa until about 5 000 years BP, probably corresponding to northward extension of the sahel savanna. One important change took place also at the same time in the wet north tropical zone where, between about 7 000 and 4 000 years BP, there occurred an extension of taxa growing presently on the well-leached soils of interfluves.Such a change near 7 000 years BP also appears in the available stratigraphical, sedimentological and pedological data from tropical north Africa. One observes particularly that, between 15 000 and 7 000 years BP, the

scholarly journals HISTORY OF VEGETATION AND CLIMATE OF THE OKINSKY PLATEAU (EASTERN SAYAN) IN THE HOLOCENE

2021 ◽  
pp. 17-19
Author(s):  
E. V. Volchatova ◽  
E. V. Bezrukova ◽  
A. A. Amosova ◽  
Maarten van Hardenbroek ◽  
N. V. Kulagina
Keyword(s):  
The Holocene ◽  
History Of Vegetation ◽  
History Of ◽  
Eastern Sayan ◽  
Vegetation And Climate

A Late Holocene desiccation of Lake Hoare and Lake Fryxell, McMurdo Dry Valleys, Antarctica

1998 ◽  
Vol 10 (3) ◽  
pp. 247-256 ◽  
Author(s):  
W.B. Lyons ◽  
S.W. Tyler ◽  
R.A. Wharton ◽  
D.M. McKnight ◽  
B.H. Vaughn
Keyword(s):  
Late Holocene ◽  
Mcmurdo Dry Valleys ◽  
Published Data ◽  
Dry Valleys ◽  
Humid Climate ◽  
The Past ◽  
Victoria Land ◽  
History Of ◽  
Lake Fryxell ◽  
Climatic History

Stable isotope data from waters of lakes in the McMurdo Dry Valleys (MDV) of southern Victoria Land, Antarctica are presented in order to establish the climatic history of this region over the past two millennia. New data from Lake Fryxell and Lake Hoare in Toylor Valley, along with previously published data from Lake Vanda, Wright Valley and Lake Bonney, Taylor Valley are used to infer the recent climatic history of MDV. Lakes Vanda, Fryxell and Bonney appear to have lost their ice covers and evaporated to small, hypersaline ponds by 1000 to ~1200 yr BP. Lake Hoare either desiccated or did not exist prior to 1200 yr BP. These data indicate a major lowering of lake level prior to ~1000 yr BP, followed by a warmer and/or more humid climate since then.

DOLI: TRANSLATING AN AFRICAN ENVIRONMENTAL HISTORY OF LOSS IN THE SANGHA RIVER BASIN OF EQUATORIAL AFRICA

2000 ◽  
Vol 41 (3) ◽  
pp. 373-394 ◽  
Author(s):  
TAMARA GILES-VERNICK
Keyword(s):  
Environmental History ◽  
Resource Use ◽  
Central African Republic ◽  
Environmental Knowledge ◽  
Environmental Interventions ◽  
Beliefs And Practices ◽  
The Past ◽  
Equatorial Africa ◽  
Complex Dimensions ◽  
History Of

This essay is about a conceptual category of historical and environmental knowledge and about how a particular group of Africans use that category to understand and debate change. It is, in effect, an exercise in translation. In the middle and upper Sangha basin forests of the Central African Republic (C.A.R.) and Cameroon, Mpiemu speakers have articulated a broad category, doli, through which they express, debate and make claims of truth about the past and present. Glossing doli as ‘history’ does little justice to the richly complex dimensions of this category, for doli encompasses a multitude of relationships to the past. It can refer to a distant unchanging past, as well as to the knowledge, beliefs and practices associated with that past. Mpiemu people hold up the knowledge, beliefs and practices as an idealized framework to guide their behavior toward one another and their uses of fields, forests, rivers and streams. But doli can also describe and frame the accumulated experiences – identifiable events, people and places – of elderly people. In all of these expressions about the past, Mpiemu use idioms linking persons and their environments, those of cords and vines and of mobility (wandering) and stasis (sitting), to articulate doli's central aim of ‘leaving a person behind’. Tracing doli's different meanings, genres and aims can illuminate how the category has changed over the twentieth century, how Mpiemu have interpreted environmental interventions in the Sangha basin, and why they have engaged in conflicts over their entitlement to valued forest resources. Hence, it offers insights into why people use natural resources as they do and provides an alternative to exclusively materialist explanations for conflicts over resource use.

scholarly journals THE LATE HOLOCENE HISTORY OF VEGETATION OF THE ACCUMULATIVE PLAIN IN THE INNER PART OF THE USSURI BAY

2021 ◽  
Author(s):  
П.С. Белянин ◽  
Н.И. Белянина
Keyword(s):  
Plant Communities ◽  
Late Holocene ◽  
Final Phase ◽  
Natural Conditions ◽  
Climatic Fluctuations ◽  
The Holocene ◽  
History Of Vegetation ◽  
Broad Leaf ◽  
History Of

На основе палинологических данных, восстановлена история развития природной среды аккумулятивной равнины в кутовой части Уссурийского залива за последние 5350 кал. л. Определены особенности структуры растительного покрова в завершающую фазу оптимума голоцена, а также при разнонаправленных климатических флуктуациях позднего голоцена. В завершающую фазу оптимума голоцена широколиственные растения в горном обрамлении были распространены более широко, чем в настоящее время. На аккумулятивной равнине преобладали мелколиственные растительные сообщества с доминированием березы обыкновенной, гибридных берез и ольхи. Похолодание, начавшееся в конце среднего и продолжившееся в начале позднего голоцена, привело к сокращению в растительности широколиственных растений и более широкому распространению мелколиственных. В конце позднего голоцена в кутовой части Уссурийского залива сложились природные условия, обусловившие формирование современной структуры растительности. Based on the palynological data, the history of vegetation on the accumulative plain in the inner part of the Ussuri Bay was reconstructed. Features of the structure of the vegetation cover during the final phase of the Holocene optimum and at multidirectional climatic fluctuations in the Late Holocene were identified. Broad-leaf plants in the final phase of the Holocene were more widely-spread on the surrounding mountain than at present. On the accumulative plains grassy meadows with small-leaf plant communities dominated. Deterioration of natural conditions during the transition to the Late Holocene caused a decrease in vegetation of broad- leaved plants and in an increase in the role of small-plants. At the end of the Late Holocene natural conditions developed in the inner part of the Ussuri Bay, that conditioned the formation of the modern structure of vegetation.

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