University of Minnesota
University of Minnesota
College of Biological Sciences
http://www.cbs.umn.edu/

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BioCON : Biodiversity, Elevated CO2, and N Enrichment - Experiment 141


Leaf net photosynthesis in CO2 x N x water treatment combinations

Years Available: 2007 - 2010

Principle Investigators

Lee, Tali

View All Experiment and Dataset Methods

ATTRIBUTES

FieldNameDefinitionUnitCode
1DateDate of measurement
2Time Time of measurement
3RingBioCON ring
4PlotBioCON plot
5SpeciesSpecies used in photosynthetic measurement
6fxgroupFunctional group of species measuredforb=non-leguminous forb, C3=C-3 grass, legume=leguminous forb, C4=C-4 grass
7CO2 trtCO2 Treatment Cenriched=564ppm, Camb=ambient CO2
8N trtNitrogen treatment Nenrich=4g NH4NO3 per MeterSquared per year, Namb=Ambient Nitrogen
9H2O trtWater treatment H2Oneg=rain removal treament via portable rain shelters, H2Oamb=natural rain fall
10CountOfSpeciesCount Of Species planted in plot as assigned by e141 diversity treatmentnumber
11repReplicate of photosynthetic measurement for each plot/speciesnumber
12atgrwthCO2 concentration of measurementatgrowth=CO2 concentration of measurement equivalent to the ring concentration, other=measurement taken at the CO2 concentration of the other treatment
13TH2OVolumetric soil water content (percent) 0-60 mm depthdimensionless
14Amax area (??mol CO2 m-2 s-1)Assimilation rate on a leaf area basismicromolesPerSquareMeterPerSecond
15Amax mass (nmol CO2 g-1 s-1)Assimilation rate on a leaf mass basisnanomolsPerGramPerSecond
16gs (mol m-2 s-1)Stomatal conductance to water vapormillimolesPerSquareMeterPerSecond
17A/gs (mmol CO2/mol H2O)Instantaneous water use efficiency (photosynthesis rate/stomatal conductance) millimolesPerMole
18Tleaf (oC)Leaf temperature estimate, degrees Celsiuscelsius
19Tair (oC)Air temperature in sample cell (oC)celsius
20CO2R (ppm)Reference CO2 concentration for measurement (ppm)micromolesPerMole
21H2ORWater concentration in reference airmillimolesPerMole
22Sample cell H2O (mmol H2O mol-1)Water concentration in sample airmillimolesPerMole
23RH_S (percent)Relative humidity of sample air coming off of leafdimensionless
24PARPhotosynthetically active radiationmicromolesPerSquareMeterPerSecond
25VpdL (kPa)Vapor pressure deficit based on leaf temp (kPa)kilopascal
26PS lfArea (cm2)Leaf area used for gas exchange measurementsquareCentimeters
27PS lfmass (g)Leaf mass used for gas exchange measurementgram
28SLA (cm2/g)Specific leaf areacubicCentimetersPerGram
29Portable gas exchange system usedPortable gas exchange system usedCIRAS1=PP Systems Hitchin UK, Licor 6400=Li-Cor Inc. Lincoln Nebraska
30H2Oneg trt (cm) cumulativeMean cummulative amount of rain (for season) received by the reduced water plotscentimeter
31H2Oamb trt (cm) cumulativeMean cummulative amount of rain (for season) received by the ambient plotscentimeter
323 day H2Oamb (cm)Mean amount of rain received in prior 3 day period in ambient plotscentimeter
337 day H2Oamb (cm)Mean amount of rain received in prior 7 day period in ambient plotscentimeter
34percent H2Oneg trt (cumulative)Mean percent of rain withheld to date within seasoncentimeter
35H2Oamb day countNumber of days since rain in ambient plotsdimensionless
36H2Oneg day countNumber of days since rain in reduced water plotsdimensionless
37Day count spreadNumber of days separating timing of rain events in reduced-water compared to ambient plotsdimensionless
 

SAMPLE DATASET

DateTimeRingPlotSpeciesfxgroupCO2 trtN trtH2O trtCountOfSpeciesrepatgrwthTH2OAmax area (?mol CO2 m-2 s-1)Amax mass (nmol CO2 g-1 s-1)gs (mol m-2 s-1)A/gs (mmol CO2/mol H2O)Tleaf (oC)Tair (oC)CO2R (ppm)H2ORH2OSRH_S (percent)PARVpdL (kPa)PS lfArea (cm2)PS lfmass (g)SLA (cm2/g)Portable gas exchange system usedH2Oneg trt (cm) cumulativeH2Oamb trt (cm) cumulative3 day H2Oamb (cm)7 day H2Oamb (cm)percent H2Oneg trt (cumulative)H2Oamb day countH2Oneg day countDay count spread
06/12/079:034233Lupinus perennislegumeCambNambH2Oamb91atgrwth324.4360.340.631343338.724.123.940317.724.180.111760.600214772.670.0181147.5CIRAS11.7600.1328990
06/12/079:154233Bromus inermisC3CambNambH2Oamb91atgrwth3.321.7424.360.480616245.223.32339617.720.872.413300.793129341.250.0064195.3CIRAS11.7600.1328990
06/12/079:224243Bromus inermisC3CambNambH2Oneg91atgrwth3.810.9197.040.08227384132.323.722.638817.419.265.412481.014957576.120.0338181.1CIRAS11.7600.1328990
06/12/079:254186Lupinus perennislegumeCambNenrichH2Oamb91atgrwth3.918361.190.503970835.722.722.239718.822.380.312710.54800641.950.0097201CIRAS11.7600.1328990
06/12/079:304186Andropogon gerardiC4CambNenrichH2Oamb91atgrwth2.931.2608.270.149408208.927.526.841517.821.959.512891.491850695.30.0272194.9CIRAS11.7600.1328990
06/12/079:304186Bromus inermisC3CambNenrichH2Oamb91atgrwth3.814.5249.530.2897736502322.338319.120.171.113700.817233520.620.0036172.2CIRAS11.7600.1328990
06/12/079:354194Bromus inermisC3CambNenrichH2Oamb91atgrwth3.916.4422.290.3491774722.72238620.821.878.512930.597922060.720.0028257.1CIRAS11.7600.1328990
06/12/079:504243Lupinus perennislegumeCambNambH2Oneg91atgrwth4.236.1466.760.676796353.323.322.839619.923.481.414290.53298411.540.0119129.4CIRAS11.7600.1328990
06/12/0710:05111Lupinus perennislegumeCenrichNenrichH2Oamb91atgrwth3.54.173.780.234595617.424.423.459522.524.27913450.642245591.660.0092180.4CIRAS11.7600.1328990
06/12/0710:10121Bromus inermisC3CenrichNenrichH2Oamb91atgrwth3.915.3256.250.2009628762321.959120.321.275.314140.695218920.940.0056167.9CIRAS11.7600.1328990
06/12/0710:18117Andropogon gerardiC4CenrichNambH2Oneg91atgrwth3.418.3323.760.1071907170.62928.460917.821.252.811301.894849334.780.027177CIRAS11.7600.1328990
06/12/0710:25121Andropogon gerardiC4CenrichNenrichH2Oamb91atgrwth2.722.2384.870.08447776263.32625.259219.220.961.811071.291206794.430.0256173CIRAS11.7600.1328990
                                     

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BioCON : Biodiversity, Elevated CO2, and N Enrichment : Leaf net photosynthesis in CO2 x N x water treatment combinations

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