‘Relationships between relationships’in forest stands:intercepts and exponents analyses-中国Betway体育网页登陆

摘要 Relationshipsbetweendiameteratbreastheight(dbh)versusstanddensity,andtreeheightversusdbh(heightcurve)wereexploredwiththeaimtofindiftherewerefunctionallinksbetweencorrespondentparametersoftherelationships,exponentsandinterceptsoftheirpowerfunctions.Ageometricmodelofaforeststandusingaconicapproximationsuggestedthatthereshouldbeinterrelationsbetweencorrespondentexponentsandinterceptsoftherelationships.Itisequivalenttoatypeof‘relationshipbetweenrelationships’thatmightexistinaforeststandundergoingself-thinning,andmeansthatparametersofonerelationshipmaybepredictedfromparametersofanother.Thepredictionsofthemodelweretestedwithdataonforeststandstructurefrompublisheddatabasesthatinvolvedanumberoftreesspeciesandsitequalitylevels.Itwasfoundthatthecorrespondentexponentsandinterceptsmaybedirectlyrecalculatedfromoneanotherforthesimplestcasewhenthetotalstemsurfaceareawasindependentofstanddensity.Forcaseswheretotalstemsurfaceareachangeswiththedropofdensity,itispossibletodevelopageneralizationofthemodelinwhichtheinterrelationshipsbetweencorrespondentparameters(exponentsandintercepts)maybestillestablished.

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‘Relationships between relationships’in forest stands:intercepts and exponents analyses

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