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|Title: ||Estimation of Medium-Term Soil Redistribution Rates in Ibadan, Nigeria, by using the 137Cs Technique|
|Authors: ||Birte, Junge|
Abaidoo, Robert C.
|Issue Date: ||Oct-2008|
|Publisher: ||Competition for Resources in a Changing World: New Drive for Rural Development|
|Citation: ||Competition for Resources in a Changing World: New Drive for Rural Development, October 7-9 2008|
|Abstract: ||Soil erosion is one of the most critical environmental problems in sub-Saharan Africa.
It causes on-site degradation of the natural resource base, as well as off-site problems.
Reduction of soil loss is therefore important to maintain soil productivity and contribute to
food security in the region. Quantitative data on the extent and rates of soil redistribution
are necessary to guide the development of effective resource management. The use of fallout
radionuclides as tracers can provide the required information, since fallout radionuclides
are quickly and strongly adsorbed by fine soil particles after deposition and primarily
redistributed by physical processes associated with water and wind.
The contribution represents the test of this technique conducted in Ibadan, Nigeria,
(7 30’N 3 54’E) in 2007 and 2008. To describe the spatial and vertical distribution of
caesium-137 (137Cs) in undisturbed soils, reference sites were sampled at the beginning.
Fields characterised by ridges prepared parallel to slope or by flat bed preparation were
sampled according to a grid design to determine the spatial 137Cs distribution. Cores for
depth-incremental sectioning were also taken on the upper and lower slope to describe
the 137Cs depth profiles. All soil samples were analysed by gamma spectrometry using a
high-purity Germanium (HPGe) detector. The results obtained from the reference sites
show the highest 137Cs concentration in the upper few centimeters of the topsoil and
a decrease with depth. The analyses of the samples collected from the field are still in
progress. As soil erosion was observable, it is expected that the 137Cs inventories will be
reduced in the soil of the upper slope and increased in the deposition zone on the lower
slope. Different conversion models, including mass balance models, will be used to estimate
the rates of erosion and deposition based on the measurements. The 137Cs inventories will
be interpolated to visualise the spatial distribution of soil redistribution within the study
area on a map. Hence, the study will provide quantitative data on soil redistribution in
the savannah of West Africa and contribute to improved soil conservation in Africa|
|Description: ||An article published by Competition for Resources in a Changing World:
New Drive for Rural Development, October 7-9, 2008|
|Appears in Collections:||College of Science|
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