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1、Proc.Natl.Acad.Sci.USAVol.95,pp.7830±7835,June1998PlantBiologyTheinterspecificmass±densityrelationshipandplantgeometry(allometryyevolutionarycomparativeanalysisyinterspecificscaling)MIGUELFRANCO*ANDCOLLEENK.KELLY²DepartamentodeEcologõÂaEvolutiva,InstitutodeEcologõÂa,UniversidadNacionalAutoÂnomade
2、MeÂxico,ApartadoPostal70-275,04510Coyoacan,DistritoFederal,MexicoCommunicatedbyRichardSouthwood,UniversityofOxford,Oxford,UnitedKingdom,March10,1998(receivedforreviewApril10,1997)ABSTRACTWepresentanaprioritheoreticalframeworkofthosemanypossibleslopes(e.g.,seerefs.5,16,17)makesfortheinterspecifica
3、llometricrelationshipbetweenstandanargumentfromwhatmaybefalsepremises.massandplantpopulationdensity.OurmodelpredictsaslopeThustheinterspecificrelationshipbetweenmassandnum-of21¤bercanbebestunderstoodbybuildinganaprioriexpectation3betweenthelogarithmofstandmassandthelogarithmofstanddensity,thuscon
4、flictingwithapreviouslyassumedoftherelationshipfrombasicprinciples.Oncesuchanexpec-slopeof21¤2.Ourmodelrestsonaheuristicseparationoftationisconstructed,datacanbeusedtoexaminethevalueofresource-limitedlivingmassandstructuralmassintheplanttheexplanation.Beingapriori,themodelpresentedhereinbody.Wepo
5、intoutthatbecauseofsimilarresourcerequire-buildsanexpectationofarelationshipthatallowsustomentsamongplantsofdifferentsizes,anonzeroplantmass±speculateonpossiblecausesfordeviationsfromthepredicteddensityslopeisprimarilydefinedbystructuralmass.Specif-relationship,andtosuggestfocalareasfordatacollec
6、tion.Weically,theslopeisaresultof(i)thephysicalsize-dependentconstructthismodelonthepropositionthatanyrelationshiprelationshipbetweenstemwidthandheight,(ii)foliage-thatmayexistbetweenplantpopulationdensityandabove-dependentdemandsofconductance,and(iii)thecumulativegroundmassofastandistheresultoft
7、hemultiplerolesplayednatureofstructuralmass.Thedatasupportourmodel,bothbyabove-groundplanttissue.Theserolesarelightintercep-whenthepotentialsamplingbiasoftaxonomicrelatednessistion,conductionofresourcesalongtheplantbod
