GAEZ_Model_Documentation.pdf
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GAEZ_Model_Documentation.pdf
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FoodandAgricultureOrganizationoftheUnitedNationsGAEZ2009GlobalAgro-ecologicalZonesIIASAInternationalInstituteforAppliedSystemsAnalysisGAEZver3.0GlobalAgro-ecologicalZonesModelDocumentationDocumentationDocumentationiiGlobalAgroEcologicalZones(GAEZv3.0)ModelDocumentationGntherFischer,FreddyO.Nachtergaele,SylviaPrieler,EdmarTeixeira,GzaTth,HarrijvanVelthuizen,LucVerelst,DavidWibergiiiivDisclaimerThedesignationsemployedandthepresentationofmaterialsinGAEZdonotimplytheexpressionofanyopinionwhatsoeveronthepartoftheInternationalInstituteforAppliedSystemsAnalysis(IIASA)ortheFoodandAgricultureOrganizationoftheUnitedNations(FAO)concerningthelegalstatusofanycountry,territory,cityorareaoritsauthorities,orconcerningthedelimitationofitsfrontiersorboundaries.IIASAandFAOIIASAandFAOarethesoleandexclusiveownersofallrights,titlesandinterests,includingtrademarks,copyrights,tradenames,tradesecretsandotherintellectualpropertyrights,containedinthedataandsoftwareofGAEZ.AcknowledgementsandcitationFullacknowledgementandcitationinanymaterialsorpublicationsderivedinpartorinwholefromGAEZdataisrequiredandmustbecitedasfollows:
IIASA/FAO,2012.GlobalAgroecologicalZones(GAEZv3.0).IIASA,Laxenburg,AustriaandFAO,Rome,Italy.vviTableofContentsTableofContents.viTables.viiiFigures.ixAppendixes.xAppendixfigures.xAppendixtables.xiPreface.xiiAcronymsandabbreviations.xiv1Introduction.11.1TheAgroEcologicalZonesMethodology.11.2StructureandoverviewofGAEZprocedures.21.2.1ModuleI:
Agroclimaticdataanalysis.31.2.2ModuleII:
Biomassandyieldcalculation.31.2.3ModuleIII:
Agroclimaticconstraints.41.2.4ModuleIV:
Agroedaphicconstraints.41.2.5ModuleV:
Integrationofclimaticandedaphicevaluation.51.2.6ModuleVI:
ActualYieldandProduction.51.2.7ModuleVII:
YieldandProductionGaps.62DescriptionofGAEZinputdatasets.72.1Climatedata.72.1.1Observedclimate.72.1.2ClimateScenarios.82.1.3UseofclimatedatainGAEZ.82.2Soildata.82.3Elevationdataandderivedterrainslopeandaspectdata.92.4Landcoverdata.112.5Protectedareas.122.5.1WDPA2009.122.5.2Natura2000.122.6Administrativeareas.143ModuleI(Agroclimaticanalysis).173.1OverviewModuleI.173.2Preparationofclimaticvariables.173.2.1Temporalinterpolation.203.3ThermalRegimes.213.3.1Thermalclimates.213.3.2ThermalZones.223.3.3Temperaturegrowingperiods(LGPt).233.3.4Temperaturesums(Tsum).243.3.5Temperatureprofiles.243.3.6Permafrostevaluation.253.4Soilmoistureregime.263.4.1Soilmoisturebalance.263.4.2Soilmoisturebalanceswithsoilmoistureconservation.273.4.3Lengthofgrowingperiod(LGP).313.4.4Multiplecroppingzonesforrainfedcropproduction.323.4.5Equivalentlengthofthegrowingperiod.353.4.6NetPrimaryProductivity(NPP).353.5GridcellanalysisModuleI.363.6DescriptionofModuleIoutputs.364ModuleII(Biomasscalculation).37vii4.1Introduction.374.2LandUtilizationTypes.374.3ThermalsuitabilityscreeningofLUTs.384.4Biomassandyieldcalculation.414.5Waterlimitedbiomassproductionandyields.424.5.1Cropwaterrequirement.424.5.2Yieldreductionduetowaterdeficits.434.5.3AdjustmentofLAIandHiinperennialcrops.434.6Cropcalendar.454.7CO2fertilizationeffectoncropyields.454.8GridcellanalysisModuleII.474.9DescriptionofModuleIIoutputs.475ModuleIII(Agroclimaticyieldconstraints).495.1Introduction.495.2Conceptualbasis.505.3Calculationprocedures.525.1DescriptionofModuleIIIoutputs.536ModuleIV(Agroedaphicsuitability).556.1Introduction.556.1.1Levelsofinputsandmanagement.566.1.2Watersupplysystems.576.1.3Soilsuitabilityassessmentprocedures.586.2Soilcharacteristics.606.2.1Soilprofileattributes.606.2.2Soildrainage.626.2.3Soilphases.646.3Soilsuitabilityratings.676.3.1Soilprofileattributesratings.676.3.2Soiltextureratings.686.3.3Soildrainageratings.696.3.4Soilphasesratings.696.4Soilqualityandsoilsuitability.716.4.1Soilquality.716.4.2Soilsuitability.756.5Terrainsuitability.776.6Soilandterrainsuitabilityassessmentforirrigatedconditions.806.6.1Soilsuitabilityforirrigatedconditions.806.6.2Terrainsuitabilityforirrigatedconditions.806.7Soilandterrainsuitabilityassessmentforrainfedconditionsunderwaterconservationregimes836.8Fallowperiodrequirements.836.9Suitabilityofwatercollectingsites.846.1DescriptionofModuleIVoutputs.857ModuleV(Integrationofclimaticandedaphicevaluation).867.1Introduction.867.2DescriptionofModuleVoutputs.867.2.1MainprocessingstepsinModuleV.867.2.2ModuleVoutputresults.878ModuleVI(ActualYieldandProduction).898.1Introduction.898.2Downscalingofagriculturalstatisticstogridcells.898.2.1Estimationofcultivatedlandshares.908.2.2Allocationofagriculturalstatisticstocultivatedland.91viii8.1DescriptionofModuleVIoutputs.919ModuleVII(YieldandProductionGaps).959.1Introduction.959.2Yieldandproductiongapsassessmentprocedures.969.3DescriptionofModuleVIIoutputs.97References.99TablesTable21ClimaticinputvariablesfortheGAEZassessment.7Table31Classificationofthermalclimates.22Table32Temperatureprofileclasses.25Table33ClassificationofpermafrostareasusedintheGAEZassessment.26Table34Waterbalanceparametersbytemperatureandcover.30Table35Moistureregimes.31Table36Delineationofmultiplecroppingzonesunderrainfedconditionsinthetropics.34Table37Delineationofmultiplecroppingzonesunderrainfedconditionsinsubtropicsandtemperatezones.34Table41Parameterizationusedtocorrectharvestindex(Hi)andleafareaindex(LAI)forsuboptimumlengthoftheeffectivegrowthperiod(LPGeff).44Table42CropspecificcoefficientsforthecalculationofCO2fertilizationeffect.45Table43YieldadjustmentfactorsforCO2fertilizationeffectaccordingtolandsuitabilityratings46Table44TheCO2concentrations(ppm)usedtomodelfertilizationeffectinGAEZaccordingtodifferentIPCCscenariosandtimepoints.46Table51Agroclimaticconstraintsforrainfedwinterwheat.52Table61Watersupplysystem/cropassociations.57Table62Landqualities.58Table63Soilqualitiesandsoilattributes.60Table64Soiltextureseparates.61Table65Soilphases.64Table66Soilprofileattributeratingsforrainfedwheat.67Table67Soiltextureratingsforrainfedwheat.68Table68Soildrainageclasses.69Table69Soildrainageratingsforrainfedwheat.69Table610Soilphaseratingsforrainfedwheat.70Table611Terrainsloperatingsforrainfedconditions(Fm16%).10Figure24Exampleoflandcoverdata:
dominantlandcoverpatternintheHWSD.12Figure25Protectedareas.13Figure26GAOULcountryboundarieslayerwithGAEZregionalization14Figure31InformationflowinModuleIoftheGAEZmodelframework.15Figure32Thermalclimates.20Figure33ThermalZones.21Figure34Frostfreeperiod(LGPt10).22Figure35TemperaturesumsforthefrostfreeperiodwithTa10oC.22Figure36Referencepermafrostzones.24Figure37Schematicrepresentationofwaterbalancecalculations.25Figure38ReferenceLengthofGrowingPeriodZones.26Figure39Referencelengthofgrowingperiod.29Figure310Multiplecroppingzonesforrainfedconditions.31Figure310Multiplecroppingzonesforirrigatedconditions.31Figure41InformationflowofModuleII.35Figure42Schematicrepresentationofthermalsuitabilityscreening.37Figure43Schematicrepresentationofkcvaluesfordifferentcropdevelopmentstages.40Figure44YieldresponsetoelevatedambientCO2concentrations.44Figure51InformationflowsofModuleIII.46Figure52Agroclimaticallyattainableyieldofwheat.50Figure61Regionaldistributionofsoildatasources.51Figure62InformationflowinModuleIV.52Figure63Soilsuitabilityratingprocedures.55Figure64Soiltextureclassification.57Figure65Rainfedsoilsuitability,lowinputlevel.73Figure66Rainfedsoilsuitability,highinputlevel.73Figure67Rainfedsoilandterrainsuitability,lowinputlevel.75Figure68Rainfedsoilandterrainsuitability,highinputlevel.75Figure69Watercollectingsites.82Figure71InformationflowofModuleV.84Figure72MappingandtabulationinModuleVresults.85Figure73Agroecologicalsuitabilityandproductivitypotentialofwheat.85Figure81InformationflowofModuleVI.86Figure82Sharesofcultivatedlandby5arcminutegridcell.88Figure83Harvestedareaofrainfedmaizein2000.89Figure84Yieldofrainfedmaizein2000.89Figure85Productionofrainfedmaizein2000.90Figure91SchematicrepresentationofModuleVII.90Figure92Yieldgapestimationprocedures.91Figure93Yieldgapratios.92xAppendixesAppendix21CountryList(GAUL)andregionalizations.117Appendix31CalculationofReferenceEvapotranspiration.118Appendix32OutputsModuleI.121Appendix33SubroutinedescriptionsofModuleI.124Appendix34ExampleofModuleIoutputatgridcelllevel.126Appendix41Cropsandlandutilizationtypes(LUTs).127Appendix42Parametersforcalculationofwaterlimitedyields.136Appendix43TemperatureProfileRequirements.138Appendix44Cropvernalizationrequirements.139Appendix45Biomassandyieldcalculation.141Appendix46Biomassandyieldparameters.143Appendix47OutputofModuleII.144Appendix48SubroutinedescriptionsofModuleII.146Appendix49ExampleofModuleIIoutputatgridcelllevel.152Appendix51Agroclimaticconstraintsfor.152Appendix52OutputsModuleIII.152Appendix53SubroutinedescriptionsofModuleIII.153Appendix61Soildrainageclasses.154Appendix62Soilprofileattributesuitabilityratings.154Appendix63Soiltexturesuitabilityratings.154Appendix64Soildrainagesuitabilityratings.154Appendix65Soilphasesuitabilityratings.154Appendix66Terrainslopesuitabilityratings.154Appendix67Fallowperiodrequirements.154Appendix68Suitabilityofwatercollectingsites.155Appendix69OutputsofModuleIV.159Appendix610SubroutinedescriptionsofModuleIV.161Appendix71OutputsofModuleV.164Appendix72SubroutinedescriptionsofModuleV.165Appendix73Cropsummarytabledescription.167Appendix81Estimationofsharesofcultivatedlandbygridcell.168Appendix82Estimationofareayieldandproductionofcrops.169Appendix83OutputsofModuleVI.169Appendix9Globalterrainslopeandaspectdatadocumentation.175AppendixfiguresFigureA31StructureofsubroutinesandfunctionsinModuleI.118FigureA41DiagramofthesubroutinesandfunctionsofGAEZModuleII.141FigureA51DiagramofthesubroutinesandfunctionsofGAEZModuleIII.147FigureA61DiagramofthesubroutinesandfunctionsofGAEZModuleIV.155FigureA71DiagramofthesubroutinesandfunctionsofGAEZModuleV.159xiAppendixtablesTableA31ModuleIoutputfileforthermalconditionsextractedovertheentireyear.115TableA32ModuleIoutputfiledescribingthermalconditionsduringthegrowingperiod.116TableA33ModuleIoutputforsoilmoistureconditionsandgrowingperiodlengthcharacteristics.117TableA34SubroutinesandfunctionsofModuleI.118TableA3
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