RobertBuitenwerfInstitute for Physical Geography, Goethe University Frankfurt

Altenhoeferallee 1Frankfurt-Niederursel

The data contains ACi (Photosynthesis-leaf internal Carbon concentration) curves, for 38 indiviudals of 11 different tree and shrub species (see species file) form southern african savanna, based on gas-exchange measurements taken with the Licor-6400 portable photosynthesis analyser. Measurements were taken between November 2011 and January 2012.aci curveevergreengas exchangekruger national parkphotosynthesissavannasouth africawoody plantContact data owner for permision of data use and questions.South Africa, Mpumalanga Province, Kruger National Park, southern area31.4831.48-24.01-24.012011-10-042012-04-04GenusAcaciaSpeciesnigrescensGenusBalanitesSpeciesmaughamiiGenusCombretumSpeciesapiculatumGenusDichrostachysSpeciescinereaGenusEucleaSpeciesdivinorumGenusEucleaSpeciesnatalensisGenusGymnosporiaSpeciessenegalensisGenusOchnaSpeciesnatalensisGenusSclerocaryaSpeciesbirreaGenusTerminaliaSpeciessericeaStevenHigginsDepartment of Physical Geography, Goethe University Frankfurt am Main

Altenhoeferallee 1Frankfurt am MainHesse60438Germany

higgins@em.uni-frankfurt.de

The term light-response curve describes the curve ofphotosynthesis plotted versus photosynthetic activeradiation (PAR). Photosynthesis was estimated fromgas exchange measurements on leaves. Gas exchangemeasurements were performed using two portablephotosynthetic systems (model Li-6400; Li-Cor, Lincoln,NE, USA). Plants were chosen to be healthy,adult specimens from dierent study sites, and leaveswere chosen to be without any visible damage. Measurementswere performed from morning to early afternoon.The light response curves were measuredfollowing the protocol for quick light response curvesproposed by Li-Cor in the Li-6400 manual. ChamberCO2-concentration was approximatively set to ambientlevel (400 mol mol

A total of 760 measurements (equal to 69 light response curves) were taken on 69 individuals of 20 different species Photosynthesis was estimated from gas exchange measurements on leaves. Gas exchange measurements were performed using two portable photosynthetic systems (model Li-6400; Li-Cor, Lincoln, NE, USA). Plants were chosen to be healthy, adult specimens from dierent study sites, and leaves were chosen to be without any visible damage. Measurements were performed from morning to early afternoon. The light response curves were measured following the protocol for quick light response curves proposed by Li-Cor in the Li-6400 manual. Chamber CO2-concentration was approximatively set to ambient level (400 mol mol Robert_ACi.txt Robert_ACi.txt273915 1#x0Acolumn #x09#x20 ecogrid://knb/shiggins.188.1 publicread speciescoding species identity coding species identity Replicateindicating the replicate number (unique per species) indicating the replicate number (unique per species) ObsObservation number natural DateDate of measurement DD-MM-YYYY0 HHMMSSClock time string, 24 hour HH:MM:SS FTimeNumber of seconds that has elapsed since file was opened. number real EBal.Energy balance mode on? number natural PhotoPhotosynthetic rate mymol CO2 m-2 s-1 real CondConductance to H2O mol H2O m-2 s-1 natural CiIntercellular CO2 concentration mymol CO2 mol-1 natural TrmmolTranspiration rate mmol H2O m-2 s-1 natural VpdLVapor pressure deficit based on Leaf temp (kPa) kilopascal real CTleafleaf tem perature calculated from energy balance. See licor manual (annex, p. 15-38) for detailed description celsius natural AreaLeaf area (cm2) squareCentimeters real BLC_1One sided boundary layer conductance (BLC),= area_cm2 * blcSlope + blcOffset. See li-6400 manual for open 6 for furthrt description. mol m-2 s-1 natural StmRatStomatal ratio estimate number natural BLCondTotal Boundary Layer Conductance mol m-2 s-1 real TairTemperature in sample cell (C) celsius real TleafTemperature of leaf thermocouple (C) kelvin real TBlkIRGA Block Temperature (C) kelvin real CO2RReference cell CO2 mymol CO2 mol-1 real CO2SSample cell CO2 mymol CO2 mol-1 real H2ORReference cell H2O mmol H2O mol-1 real H2OSSample cell H2O mmol H2O mol-1 real RH_RRelative humidity in the reference cell (%) dimensionless real RH_SRelative humidity in the sample cell (%) dimensionless real FlowFlow rate to the sample cell mymol s-1 real PARiIn-chamber quantum sensor mymol m-2 s-1 natural PARoExternal PAR mymol m-2 s-1 natural PressPressure (kPa) kilopascal real CsMchSample CO2 offset mymol mol-1 real HsMchSample H2O offset mmol mol-1 real StableFSample H2O offset number real BLCslopeBoundary layer conductance slope as function of area. See Li6400 manual for open 6.x for further definitions number real BLCoffstBoundary layer conductance offset as function of area. See Li-6400 manual for open 6.x for further definition. number real f_parinThe Fraction of Parin used for energy balance. See Li-6400 manual for open 6.x, p. 17-9 for further explanation. number natural f_paroutFraction of PARout used for Energy balance. See Li-6400 manual for open 6.x, p 17-9 for further description number natural alphaKConversion factor, used in the conversion of μmol mol-1 to W m-2. COmbination of absorption factor a and conversion factor k Joulepermicromol real StatusStatus variable dimensionless natural fdaflow / area with units conversion" (flow_um * 1E-6) / (area_cm2 * 1E-4 ) fSee Li-6400 manual for open 6.x for further descriptions. micromolpersecondsquaremeter real TransTranspiration in mol m-2 s-1 mol m-2 s-1 real Tair_Kair temperature in Kelvin kelvin real Twall_KTwall temperature in Kelvin. tCham_c + 273.15 kelvin real R_Wm2R(W/m2): incoming radiation = (parIn_um * f_parIn + parOut_um * f_parOut) * alphaK "see Li_6400 manual for further description WattperSquaremeter real Tl_Taenergy balance delta t. See Li-6400 manual for open 6.x, p. 15-37for furthrt description dimensionless real SVTleafSaturation vapor pressure as function of Tleaf.See Li-6400 manual for open 6.x, p. 14-12 and p. 15-38 for further information dimensionless natural h2o_iintercellular h2o content calculatet from SVTleaf. See Li-6400 manual for open 6.x, page 15-38 for further description. kilopascal real h20diffSee Li-6400 manual for open 6.x, p. 15-38 for further definition dimensionless real CTairComputed chamber air temperature. See Li-6400 manual for open 6.x p. 15-38 for further information celsius real SVTairsaturation vapor pressur as function of Tair. See Li-6400 manual for open 6.x for further description kilopascal real CndTotaltotal conductance calculated. See Li-6400 manual for open 6.x, p. 15-38 for further description mol m-2 s-1 real vp_kPavapor pressure chamber air. See Li-6400 manual for open 6.x, p. 15-38 for further description kilopascal real VpdAVapor pressure deficit based on Air temp (kPa) pascal real CndCO2Total Conductance to CO2, calculated. Se Li-6400 manual for open 6.x p. 15-38 for further description mol m-2 s-1 real Ci_PaIntercellular CO2 (Pa)," #36 * press_kPa * 1E-3". See Li-6400 manual for open 6.x, p15-38 for further description pascal real Ci_CaIntercellular CO2 / Ambient CO2 dimensionless real RHsfcSurface Humidity (%) dimensionless real C2SfcSurface CO2.See Li-6400 manual for open 6.2, p.15-38 for further information dimensionless real Ahs_CsBall-Berry-Parameter unknown real typeType of measurement Type of measurement463attached_fileNot authorized to access resourceOtherattached_fileNot authorized to access resourceOtherattached_fileNot authorized to access resourceOther WattperSquaremeter unknown 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 mmol H2O mol-1 mymol s-1 mymol m-2 s-1 mymol mol-1 mmol mol-1 Joulepermicromol micromolpersecondsquaremeter