StevenHigginsDepartment of Physical Geography, Goethe University Frankfurt am Main

Altenhoeferallee 1Frankfurt am MainHesse60438Germany

For photosynthetic capacity we used a Licor 6400 to derive A-Ci curves (curves of the response of photosynthetic rate to changes in leaf internal CO2 concentration) following the field protocol used by Xu and Baldocchi (2003). This protocol involves allowing the leaf to acclimatise for 30 minutes to a high (1000 ppm) chamber CO2 concentration and then programing a decrease in CO2 concentration in the sequence 1000, 700, 500, 360, 200, 150, 100, 50 ppm. The leaves were given eight minutes to acclimatise to each CO2 level before measuring the gas exchange parameters. Light intensity was set to 800 mymol*m2*s-1. licor 6400 measurements photosynthetic capacity plant growth savannaterminalia sericeaKruger National Park, South Africa31.4831.48-24.01-24.012009-03-10GenusTerminaliaSpeciessericeaStevenHigginsDepartment of Physical Geography, Goethe University Frankfurt am Main

Altenhoeferallee 1Frankfurt am MainHesse60438Germany

higgins@em.uni-frankfurt.de site1-3-10-09-ts site1-3-10-09-ts1152 13#x0Acolumn #x09 ecogrid://knb/shiggins.64.1public read "Obs"Observation number natural "HHMMSS"Clock time string, 24 hour HH:MM:SS "FTime"Number of seconds that has elapsed since file was opened. second real"Photo" Photosynthetic rate mymol CO2 m-2 s-1 real "Cond"Conductance to H2O mol H2O m-2 s-1 real"Ci" Intercellular CO2 concentration mymol CO2 mol-1 real "Trmmol"Transpiration rate mmol H2O m-2 s-1 real "VpdL"Vapor pressure deficit based on Leaf temp (kPa) kilopascal real "Area"Leaf area (cm2) squareCentimeters natural "StmRat"Stomatal ratio estimate dimensionless natural "BLCond"Total Boundary Layer Conductance mol m-2 s-1 real "Tair"Temperature in sample cell (C) celsius real "Tleaf"Temperature of leaf thermocouple (C) celsius real "TBlk"IRGA Block Temperature (C) celsius real"CO2R" Reference cell CO2 mymol CO2 mol-1 real "CO2S" Sample cell CO2 mymol CO2 mol-1 real "H2OR"Reference cell H2O mmol H2O mol-1 real "H2OS"Sample cell H2O mmol H2O mol-1 real "RH_R"Relative humidity in the reference cell (%) number real "RH_S"Relative humidity in the sample cell (%) number real"Flow" Flow rate to the sample cell mymol s-1 real "PARi" In-chamber quantum sensor mymol m-2 s-1 natural "PARo" External PAR mymol m-2 s-1 natural "Press"Pressure (kPa) kilopascal real"CsMch" Sample CO2 offset mymol mol-1 real "HsMch"Sample H2O offset mmol mol-1 real "StableF"Stable / Total as fraction number real "Status"Status variable dimensionless natural16attached_fileNot authorized to access resourceOtherattached_fileNot authorized to access resourceOther mymol CO2 m-2 s-1 mol H2O m-2 s-1 mymol CO2 mol-1 mmol H2O m-2 s-1 mol m-2 s-1 mymol s-1 mymol m-2 s-1 mymol mol-1 mmol mol-1 mmol H2O mol-1