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Soil heavy metal concentration patterns at two speed zones along the Gaborone-Tlokweng border post highway, Southeast Botswana
(JASEM http://www.ajol.info/index.php/jasem/article/view/43693/27216, 2006-06)
Since 1988 Botswana has been experiencing an unprecedented increase in vehicular traffic which
is suspected to be having contamination effects on soils along heavily used roads in the country. This study aimed at
understanding ...
Nitrogen cycling in the soil–plant system along a precipitation gradient in the Kalahari sands
(Blackwell Publishing, 2004-01-01)
Nitrogen (N) cycling was analyzed in the Kalahari region of southern Africa, where a
strong precipitation gradient (from 978 to 230mm mean annual precipitation) is the main
variable affecting vegetation. The region is ...