2021 # Stand biomass estimation methods for Eucalyptus grandis and Eucalyptus dunnii in Uruguay

**Abstract:** Biomass additivity is a desirable characteristic of a system of equations for predicting components and total biomass, since equations independently adjusted generate biologically inconsistent results. The aim of this study was to fit and compare three methods for modelling biomass: (i) total biomass individual regression, (ii) total biomass regression function calculated as the sum of separate biomass components, and (iii) simultaneous equations of biomass components based on Nonlinear Seemingly Unrelated Reg…

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“…Individual models selected for each biomass component were fitted simultaneously using the additive system of equations based on nonlinear seemingly unrelated regression (NSUR) to ensure compatibility between the total biomass and the sum of the fractions [37]. This statistical approach has been frequently used in biomass studies [38]. The Proc SQL program of SAS [49] was used to perform the routine.…”

confidence: 99%

“…Individual models selected for each biomass component were fitted simultaneously using the additive system of equations based on nonlinear seemingly unrelated regression (NSUR) to ensure compatibility between the total biomass and the sum of the fractions [37]. This statistical approach has been frequently used in biomass studies [38]. The Proc SQL program of SAS [49] was used to perform the routine.…”

confidence: 99%

“…The total biomass (Wt) was represented by the sum of the Wa and the below-ground dry weight biomass (Wb). Individual models selected for each biomass component were fitted simultaneously using the additive system of equations based on nonlinear seemingly unrelated regression (NSUR) [37,38]. The powder samples of the tree components were analysed for the C concentrations using a NIR macro elemental analyser (Eurovector EA 3000) according to the Dumas combustion method.…”

confidence: 99%

“…Individual models selected for each biomass component were fitted simultaneously using the additive system of equations based on Nonlinear Seemingly Unrelated Regression (NSUR) to ensure compatibility between the total biomass and the sum of the fractions (Parresol 2001;Hyrigoren et al, 2021). The Proc sql program of SAS (SAS Institute 2004) was used to perform the routine.…”

confidence: 99%

“…The total biomass (Wt) was represented by the sum of Wa and the belowground dry weight biomass (Wb). Individual models selected for each biomass component were fitted and then, simultaneously using the additive system of equations based Nonlinear Seemingly Unrelated Regression (NSUR) (Parresol 2001;Hyrigoren et al, 2021).…”

confidence: 99%