AlexanderZizkaGoethe University Frankfurt

For photosynthetic capacity I used a Licor 6400 to derive light response curves (curves of the response of photosynthetic rate to changes in photosynthetic active radiation) following the field protocol indicated in the Li-6400 manual (open 5.1 manual, protocol was change for some measurements, see data table, column "method"). CO2 was set to near-ambient (400ppm). A total of 760 measurements (=69 light response curves) were performed on 69 individuals of 20 different specieskruger national parklicor 6400light response curvephotosynthetic capacitysavannasouth africawoody plantcontact owner before useKruger National Park, South Africa31.4831.48-24.01-24.012011-02-042012-04-04GenusacaciaSpeciesgerardiiGenusacaciaSpeciesnigrescensGenuscisussSpeciescornifoliaGenuscombretumSpeciesapiculatumGenuscombretumSpeciescollinumGenuscommiphoraSpeciesafricanaGenusdichrostachysSpeciescinereaGenuseucleaSpeciesdivinorumGenuseucleaSpeciesnatalensisGenusflueggeaSpeciesvirosaGenusgrewiaSpeciesbicolorGenusgrewiaSpeciesmonticolaGenusgymnosporiaSpeciessenegalensisGenuspeltophorumSpeciesafricanumGenusphilenopteraSpeciesviolaceaGenussclerocaryaSpeciesbirreaGenussennaSpeciespetersianaGenusstrychnosSpeciesmadagascariensisGenusterminaliaSpeciessericeaGenusziziphusSpeciesmucronataAlexanderZizkaGoethe University Frankfurt

azizka@rz.uni-frankfurt.deStevenHigginsDepartment of Physical Geography, Goethe University Frankfurt am Main

Altenhoeferallee 1Frankfurt am MainHesse60438Germany

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 Lightresponsecurves_azizka.txt Lightresponsecurves_azizka.txt142384 13#x0Acolumn #x09 ecogrid://knb/AZ.14.1 uid=shiggins,o=bikf,dc=ipg,dc=uni-frankfurt,dc=de all uid=azizka,o=bikf,dc=ipg,dc=uni-frankfurt,dc=de all IDA unique Identification number for each light response curve comprised od species name and replicate number identification number Speciescoding species identity 134935792367513493579236761349357923679 RepReplicateindicating the replicate number (unique per species) indicating the replicate number (unique per species) "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 CO2mymol CO2 mol-1real"CO2S"Sample cell CO2mymol CO2 mol-1real "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 cellmymol s-1real"PARi"In-chamber quantum sensormymol m-2 s-1natural"PARo"External PARmymol m-2 s-1natural "Press"Pressure (kPa) kilopascal real"CsMch"Sample CO2 offsetmymol mol-1real "HsMch"Sample H2O offset mmol mol-1 real "StableF"Stable / Total as fraction number real "Status"Status variable dimensionless natural curve.evaluationgiving a first evaluation of the curves usefullness goodno restriction using this curve bulkycurve might show 1 or 2 outlier values and appear bulky low conductanceleaf conductance was very low during measurement methodMeasurement method is different for the curves. "fh"= humidity was fixed in sample cell during measurement (original protocol), "ff" = flow was fixed during measurement (change from original protocol due to extrem ambient values) indicating measurement method761 specieslist.txt specieslist.txt966 1#x0Acolumn #x09 ecogrid://knb/AZ.17.1 uid=azizka,o=bikf,dc=ipg,dc=uni-frankfurt,dc=de all uid=shiggins,o=bikf,dc=ipg,dc=uni-frankfurt,dc=de all Codespecies code species code GenusGenus name Genus name EpithetonSpecies epitheton Species epitheton SpeciesFUll species name Full species name21attached_fileNot authorized to access resourceOtherattached_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