GROWTH RESULTING FROM THE VARIATION AND COMBINATION OF MODELS OF CHAPMAN-RICHARDS AND SILVA-BAILEY APPLIED TO Leucaena leucocephala (Lam.) of Wit

Abstract

O objetivo deste trabalho foi desenvolver novos modelos de crescimento para recursos florestais aplicados \ue0 leucena [Leucaena leucocephala (Lam.) de Wit], tendo como base as hip\uf3teses biol\uf3gicas propostas por Chapman-Richards e Silva-Bailey. O experimento de leucena foi conduzido na Esta\ue7\ue3o Experimental da Empresa Pernambucana de Pesquisa Agropecu\ue1ria - IPA, Caruaru, PE. Foram utilizadas 544 \ue1rvores de leucena de um experimento com vinte remedi\ue7\uf5es realizadas ao longo de 12 anos. Compararam-se novos modelos de crescimento resultantes da combina\ue7\ue3o e varia\ue7\uf5es dos modelos de Chapman-Richards e Silva-Bailey, bem como outros comumente usados em recursos florestais. Para a sele\ue7\ue3o das equa\ue7\uf5es, utilizaram-se o \ucdndice de Ajuste (IA), o erro-padr\ue3o da estimativa e a distribui\ue7\ue3o gr\ue1fica dos res\uedduos. Os resultados indicaram que todos os modelos testados se ajustaram de maneira satisfat\uf3ria aos dados, podendo ser utilizados para se estimar o crescimento em altura da leucena.The main objective of this work was to develop new growth models for forest resources, applied to (leucena) [Leucaena leucocephala (Lam.) of Wit], based on the biological hypotheses proposed by Chapman-Richards and Silva-Bailey. The experiment of the leucena was carried out in the Experimental Station of the Agricultural and Liverstock Research Company of Pernambuco - IPA, in the municipal district of Caruaru - PE. Five hundred and forty four trees of Leucaena leucocephala (Lam.) of Wit were used, with 20 measures along the time. It was compared new growth models resulting from the combination and variation of the Chapman-Richards and Silva-Bailey models, as well other models used in forest resources. For the selection of the final equations, the fit of index, standard error of estimate and the graphic distribution of the residues were used. Results show that new models were as good as Chapman-Richards and Silva-Bailey and other tested. Therefore, any one of them can be applied to estimate the growth of leucena