Modeling Branch Length and Branch Angle with Linear Mixed Effects for Dahurian Larch-中国期刊网

摘要 Inthisstudy,thesampledatawasbasedon2190branchlengthandanglesamplesof30treesfromdahurianlarch（Larixgmeiinii）plantationslocatedinWuyingForestBureauinHeilongjiangProvince.Thestepwiseregressiontechniqueswereusedtodevelopbranchlengthandbranchanglemodels:BL=b1+b2DINC+b3DINC2+b4DBH·DINC2,BA=b1+b2DINC+b3DINC2+b4DBH·DINC.Then,thedevelopedmodelswerefittedusinglinearmixed-effectsmodelingapproachbasedonLMEprocedureofS-PLUSsoftware.Evaluationstatistics,suchasAIC,BIC,LogLikelihoodandLikelihoodratiotestwereusedformodelcomparisons.Theresultsshowedthatthebranchlengthandbranchanglemodelswithparametersb1,b2,b3asmixedeffectsshowedthebestperformance.Exponentialandpowerfunctionswereincorporatedintomixedbranchlengthandbranchanglemodel.Theadditionoftheexponentialandpowerfunctionssignificantlyimprovedthemixed-effectsmodel.Theplotsofstandardizedresidualsindicatedthatthemixed-effectmodelwithexponentialandpowerfunctionsshowedmorehomogeneousresidualvariancethanthemixed-effectsmodel.Validationconfirmedthatthemixedmodelwithcalibrationofrandomparameterscouldprovidemoreaccurateandpreciseprediction.Therefore,theapplicationofmixedmodelnotonlyshowedthemeantrendsofbranchlengthandbranchangle,butalsoshowedtheindividualdifferencebasedonvariance-covariancestructure.

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Modeling Branch Length and Branch Angle with Linear Mixed Effects for Dahurian Larch

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Modeling Branch Length and Branch Angle with Linear Mixed Effects for Dahurian Larch

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