Growth, Production and Economic Analysis of Clonal Stands of Eucalyptus sp. in Agroforest Systems. / Crescimento,produÃÃo e anÃlise econÃmico de povoamentos Clonais de Eucalyptus sp, em sistemas agroflorestal.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The aims of the present study were to adjust models of productivity for a sawmill to test taper functions using segmented and non segmented polynomial models to estimate the profile of the treesâ trunk to prognosticate the present and future production of stands of eucalypt and to analyse the economic viability of a âagrossilvopastorilâ system with eucalypt The units of study were composed by stands of a clone of natural hybrids of Eucalyptus urophylla x Eucalyptus camaldulensis planting in consortium with rice soybean and pasture at the spacing 4 x 10 meters aiming to produce wood for sawmill and energy The study of the productivity of the sawmill was composed by tests of models using the ordinary least squares method For the adjustment of the taper functions 40 trees were scaled rigorously by the Smalian method The segmented models tested were those of Clark et al (1991) Max &Burkhart (1976)and Parresol, Hotvedt &Cao (1987) The non-segmented models were those of SchÃepfer (1966) Hradetzky (1976)and Goulding &Murray (1976) To estimate the diametric classes of the stand the density function of probability Sb was tested All attributes were modeled and the parameters of location (e) scale (l) asymmetry (g) and kurtosis (d) were recovered The economic analysis tested the profitableness of the future sale of the wood goods and of the whole system The productivity of the wood processing could be estimated in function of dendrometric parameters The model of Hradetzky (1976) better estimated the diameters and was used in the prognosis also to estimate the volume The prognosis of the production for clones of eucalypt subjected to the agroforest systems underestimated the future volumes The economic analysis showed that the viability of the agroforest system depends more on the wood than the other components such as the soybean the rice and the âarrobaâ (15 Kg) of the cattle

ASSUNTO(S)

funÃÃo de afilamento economia florestal taper function economia florestal sistemas agroflorestais serraria diametric distribution forest economy distribuiÃÃo diamÃtrica prognose da produÃÃo prognosis of the production sawmill agroforest systems

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