Biogeochemistry ; Biogeography ; Biomass ; Carbon ; Ecosystem ; Grassland ; Model ; Nitrogen ; Ozone ; Savanna ; South Africa ; Spatial variation ; Trace-element ; Troposphere
-herbivory and low-herbivory savannas ; the problem of estimating the emissions of trace gases and smoke particles from vegetation fires in the region ; the modelling of tropospheric ozone precursors produced by the soils and plants.