Modeling of eucalyptus tree stem taper in mixed production systems

Abstract

This work's objective was to evaluate the taper estimates obtained from the mixed-effect modeling function and verify the effect of planting spacing and arrangement forthe eucalyptus tree stem form in a Crop-Livestock-Forest integration system (iCLF). Data wasgathered from an experimental iCLF area, implemented by the Brazilian Agricultural Research Company (EmpresaBrasileira de PesquisaAgropecuária-EMBRAPA Agrossilvipastoril), located in the municipality of Sinop, State of Mato Grosso, Brazil. The database used in the research developmentconsisted of the destructive cubing of 186 51-month-old trees. The modeling performance was evaluated through fit statistics and graph analysis. The model identity test evaluated the influence of the different planting arrangements on tree stem form. The mixed-effect modeling featured greater accuracy for estimating the eucalyptus taper in the iCLF system and the planting spacing and arrangement for the tree stem form.