Additive and Non-additive Biomass Equations for Black Wattle

ABSTRACT The objectives of this work were to propose additive equations for biomass components (stem and crown) and total biomass for black wattle (Acacia mearnsii De Wild.) and show the inconsistency of independently adjusted biomass equations. Two procedures were used to fit nonlinear equations of biomass: i) independent and ii) systems of equations. The second procedure, defined by the application of the seemingly unrelated regression model, has better biological and statistical properties to estimate allometric equations of biomass components and total biomass when compared with the independent estimation. An effective property of this procedure is the additivity, i.e., the estimates of component biomass are compatible with those of total biomass. Independent fitted adjusted equations do not consider the dependence between the biomass components, thus, besides the estimates being non-additive, which is an undesirable property, they will result in estimates with larger variance.

Bibliographic Details

Main Authors:	Behling,Alexandre, Péllico Netto,Sylvio, Sanquetta,Carlos Roberto, Corte,Ana Paula Dalla, Simon,Augusto Arlindo, Rodrigues,Aurélio Lourenço, Caron,Braulio Otomar
Format:	Digital revista
Language:	English
Published:	Instituto de Florestas da Universidade Federal Rural do Rio de Janeiro 2019
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2179-80872019000400101
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