Radiometric dating of recent lake sediments from a highly eroded area in semiarid Tanzania |
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| Authors: | Farid El-Daoushy Mats G Eriksson |
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| Institution: | (1) Department of Physics, Uppsala University, S-751 21 Uppsala, Sweden;(2) Department of Physical Geography, Stockholm University, S-106 91 Stockholm, Sweden |
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| Abstract: | Semiarid regions are vulnerable environments with a series of important and often discussed problems such as land degradation, water scarcity and desertification. These regions are dynamic and respond quickly to climatic and environmental changes. Unlike lakes in temperate zones, lakes in semiarid regions are yet poorly utilized as climatic and environmental indicators. In this study aquatic deposits are used to uncover the environmental history of a severely degraded area in central Tanzania. The 210Pb and 137Cs chronologies date a 360 cm long sediment sequence to 155 years. The sediments show that lake Haubi basin changed from a seasonally waterlogged depression to a lake at the turn of the century. Calculated sedimentation rates show that the catchment of the lake has been subject to varied and enhanced soil erosion during the last 155 years. |
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| Keywords: | Semiarid Tanzania erosion sediments chronologies radionuclides |
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