CO2 research 
Atmospheric CO2 is a critical resource for plants that are growing under nutrient and water limitation. Our research is aimed at understanding how key aspects of species, plant functional types and ecosystem functioning will respond to changes in the availability of atmospheric CO2 in the context of the stress-prone environments of southern Africa.
Click images above to see details of chamber and control box
Our approach has been to combine experimental and modeling approaches, and includes work on a range of questions. Early work determined the role of nutrient limitation effects on CO2 responses in fynbos Leucadendron species, and the identification of key aspects of carbohydrate metabolism that underpin these responses. More recently, we have worked on the responses of tropical C4 grassland systems to elevated atmospheric CO2 both under field and controlled microcosm conditions, quantifying substantial impacts on water use efficiency. Our most recent work has quantified the impact of CO2 levels found in the past glacial maximum to future projected levels on tree growth in fire-prone savannas. This work is showing the fundamental nature of CO2 limitation under glacial conditions.
Click images above to results of different CO2 levels on Acacia karroo
For more information about this programme contact Barney Kgope and Guy Midgley
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