EQUAÇÕES HIPSOMÉTRICAS PARA Eucalyptus spp. NÃO MANEJADO EM IDADE AVANÇADA COM TÉCNICAS DE INCLUSÃO DE COVARIANTES

CERNE

Pires, Júlio Vilela²  Altoé, Thiza Falqueto²  Scolforo, José Roberto Soares²  Mello, José Márcio de²  Scalon, João Domingos²  Oliveira, Gabriel Marcos Vieira¹ 

[1] Instituto de Defesa Agropecuária e Florestal do Espírito Santo, Mimoso do Sul, Brasil$$;Universidade Federal de Lavras, Lavras, Brazil$$

关键词: Regression;    covariates;    decomposition of parameters.;   

DOI  :  10.1590/01047760201521031740

来源: Universidade Federal de Lavras-UFLA

【 摘 要 】

The aim of the study was to establish hypsometric equations for unmanaged Eucalyptus spp. in old age. For this purpose we measured the diameter and height of 513 stems distributed in 11 species and the hypsometric relationship was established by six regression models, being selected the one with the best Akaike Information Criterion (AIC), standard error of estimative (Syx), Maximum Likelihood Ratio Test and Residual Graphical Analysis. Subsequently, the best model has undergone the inclusion of the covariates stem quality (Qf) and Species (Sp) by means of the decomposition of its parameters. Under these conditions, the model of Chapman and Richards showed the best performance in both modeling approaches. When compared both models, we observed a reduction of 71 AIC units and 7.4% in Syx and a significant improvement in all aspects of the residual distribution in the model with covariates. The results show that it is possible to provide hypsometric equations suitable for unmanaged Eucalyptus in old age, with and without addition of covariates, and the last technique has provided significant improvement in the quality of fit of the models.

【 授权许可】

Unknown