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ecologicalmodelling209(2007)264–276availableatwww.sciencedirect.comjournalhomepage:www.elsevier.com/locate/ecolmodelUsinglocalspatialautocorrelationtocompareoutputsfromaforestgrowthmodelMichaelA.Wuldera,∗,JoanneC.Whitea,NicholasC.Coopsb,TrisalynNelsonc,BarryBootsdaCanadianForestService(PacificForestryCentre),NaturalResourcesCanada,Victoria,BritishColumbia,CanadaV8Z1M5bUniversityofBritishColumbia,DepartmentofForestResourceManagement,Vancouver,BritishColumbia,CanadaV6T1Z4cUniversityofVictoria,DepartmentofGeography,Victoria,BritishColumbia,CanadaV8W3P5dWilfridLaurierUniversity,DepartmentofGeographyandEnvironmentalStudies,Waterloo,Ontario,CanadaN2L3C5articleinfoabstractArticlehistory:Comparingmodeloutputsisacriticalprecursortosuccessfullyapplyingmodelstoenviron-Received26July2006mentalissues.Inthispaper,weappliedacalibratedphysiologicalmodel(3PG)andpredictedReceivedinrevisedformtwofundamentalforestgrowthattributes(leafareaindex(LAI)andstandvolume).Aspart19April2007ofthissimulation,wesystematicallychangedtwokeymodelinputparameters(soilwaterAccepted29June2007holdingcapacityandsoilfertilityrating)andcomparedthemodeloutputsutilisingamethodPublishedonline17August2007thataccountsforlocalspatialautocorrelation.TheuseoftheGetisstatistic(Gi*)providesinsightsonthespatialramificationsofanaspatialchangetomodelinputs.Specifically,theKeywords:locationofsignificantGi*valuesidentifiedareaswherethedifferencesinLAIandstandPhysiologicalmodelvolumeoccurandarespatiallyclustered.Whensoilwaterisdoubledandsoilfertilityis3PGunchanged,bothLAIandstandvolumeincrease;conversely,whensoilwaterisdoubledLAIandsoilfertilityishalved,bothLAIandstandvolumedecrease.TheincreaseanddecreaseStandvolumeinthesemodeloutputsoccurreddifferentiallyacrossthestudyarea,althoughthereisaLocalspatialautocorrelationsimilarpatterntothelocationofthesignificantGi*values(p=0.10)inbothLAIandstandGetisstatisticvolumeoutputs,foreachmodelscenario.Analyzingthelocalspatialautocorrelationofthedifference
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