Holocene environmental changes in Namibia inferred from pollen analysis of swamp and lake deposits

Holocene - Tập 1 Số 1 - Trang 8-13 - 1991
Louis Scott1, Brigitte Cooremans1, J.S. de Wet1, J. C. Vogel2
1Department of Botany and Genetics, University of the Orange Free State, P.O. Box 339, Bloemfontein 9300, South Africa
2EMATEK, CSIR, P.O. Box 395, Pretoria, 0001, South Africa

Tóm tắt

Spring deposits exposed during building operations in downtown Windhoek, and lake sediments retrieved from underneath 50 m of water in a sinkhole (Lake Otjikoto), contain pollen profiles which reflect environmental changes in Namibia during the Holocene. At Windhoek moist local conditions are reflected by pollen in the spring deposits which were radiocarbon-dated to between ca. 7000 and 6000 BP. They remained relatively favourable until 5630 BP despite signs of drying. Weedy Compositae (Lactucoideae or Liguliflorae) increased until the end of this record ca. 2410 BP, indicating local disturbance. Deposits from Lake Otjikoto were dated to the late Holocene although an accurate chronology could not be estabiished for the sequence due to unexpected results with radiocarbon measurements. Pollen accumulation values and composition indicate relatively dry conditions after 3500 BP which were followed temporarily by a wetter climate during more recent times.

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Thông tin
Thông tin xuất bản

Holocene

Tập 1 Số 1

8-13

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