African vertisols

Vertisols formed from amphibolite in the Central African Republic contain 300-1000 mg/kg Cr, 11-200 mg/kg Cu, trace amounts to 6 mg/kg Mo and 60-300 mg/kg Ni (Aubert and Pinta, 1977). In chernozem soils of the flood plains of the Amur region, the average Cr is 400 mg/kg. High Co concentrations (100-300 mg/kg) have been found in soils. Manganese concentrations in lithomorphic vertisols are in the range of 3000-5000 mg/kg. Soils on clayey sediments, solonetses and saline alkali soils contain 50-75, 40-100 and 10-50 mg/kg Ni, respectively. 

South East African geographical regions are located partly in subtropical belts. The predominant ecosystems are Rain Green Tropical Forest with Ferrasols and subtropical Steppe with Rhodic Ferrasols and Vertisols. The biogeochemical cycling rate is intensive (Cb is 0.9). 

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