The Malopeni flux site: carbon and water fluxes in a mopane - PowerPoint PPT Presentation

The Malopeni flux site: carbon and water fluxes in a mopane -dominated savanna Alecia Nickless and Bob Scholes Ecosystem Processes and Dynamics, Natural Resources and the Environment, CSIR, South Africa

High temperature throughout the year 50 45 Min and Max Temperature (Deg Celcius) 40 35 30 Max Temp 25 Min Temp 20 15 10 5 0 09/09/2008 18/12/2008 28/03/2009 06/07/2009 14/10/2009 22/01/2010 Date

Half-hourly carbon fluxes Net Ecosystem Exchange Soil Moisture 50 30 Net Ecosystem Exchange ( � mol m -2 s -1 ) 40 20 30 Soil Mositure (%) 20 10 10 0 0 -10 -10 -20 -30 -20 -40 -50 -30 2009/02/06 2009/03/28 2009/05/17 2009/07/06 2009/08/25 2009/10/14 2009/12/03 2010/01/22 Date Dry Season Wet Season 4.5 4.5 Average Net Ecosystem Exchange Average Net Ecosystem Exchange 4 4 3.5 3.5 3 (μmol m -2 s -1 ) (μmol m -2 s -1 ) 3 2.5 2.5 2 2 1.5 1.5 1 1 0.5 0.5 0 -0.5 0 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00 00:00 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00 00:00 Time Time

Half-hourly water fluxes Water Flux Soil Moisture 30 30 20 20 Water Flux (mmol m -2 s -1 ) Soil Moisture (%) 10 10 0 0 -10 -10 -20 -20 -30 -30 2009/02/06 2009/03/28 2009/05/17 2009/07/06 2009/08/25 2009/10/14 2009/12/03 2010/01/22 Date Wet Season Dry Season 2.5 0.2 0.15 2 0.1 (mmol m -2 s -1 ) Water flux 1.5 (mmol m -2 s -1 ) 0.05 Water flux 1 0 -0.05 0.5 -0.1 0 -0.15 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00 00:00 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00 00:00 -0.5 Time Time

Why is the Malopeni site leaking carbon? CO 2 flux plotted along side PAR and temperature Blue – Temperature Green – PAR/100 Black – CO 2 flux

anickless@csir.co.za OR bscholes@csir.co.za for more information Acknowledgements CarboAfrica, The Department of Science and Technology (South Africa) and the Council for Scientific and Industrial Research are acknowledged for funding this research.