Abstract
This work analyzes the volumetric and economic production of Eucalyptus urophylla S. T. Blake stands oriented to firewood production in a three-years cutting cycle, in the region of Ipameri, State of Goias. 1,545 trees were measured and rigorously scaled. The volume data obtained was adjusted by Schumacher log-reciprocal model. The volumetrically optimal rotation was defined by the Mean Annual Increment and Land Expectation Value maximization criteria. The optimal rotation ages were between 5 and 6 years, and the economically optimal rotations were around 3 years of age. In relation to the sampled data, it may be inferred that the optimal harvest age should be at age 4.Keywords: Biological rotation age; increments; forest management. ResumoRotações volumétrica e econômica ótimas para produção de lenha de Eucalyptus urophylla em Ipameri, estado de Goiás. Este trabalho analisa a produção volumétrica e econômica de talhões de Eucalyptus urophylla S. T. Blake destinados à produção de lenha em ciclos de corte de três anos, na região de Ipameri, Goiás. Foram medidas e posteriormente cubadas rigorosamente 1.545 árvores. Os volumes obtidos foram ajustados ao modelo log recíproco de Schumacher. Obteve-se a otimização da rotação volumétrica pela maximização do incremento médio anual e do valor esperado da terra. As rotações volumetricamente ótimas identificaram a idade entre 5 e 6 anos, e as rotações economicamente ótimas ficaram em torno de três anos de idade. Com base nos dados coletados, se infere que a rotação ótima de corte deveria ficar na idade de 4 anos.Palavras-chave: Idade de corte; incrementos; manejo florestal.
Highlights
Extensive and well conducted industrial reforestations with Eucalyptus spp. has guaranteed the constant and regular supply of several industries that process and consume these plantations’ raw materials, in the country
The relatively low cost of implantation and correspondent maintenance of these reforestations, with a continuous wood production within a short period, allied to the excellent soilclimatic conditions within which the eucalypt grows in Brazil, have positioned the reforestation-based forest industry in the group of investment opportunities of highest competitiveness (RODRIGUEZ; DIAZ-BALTEIRO, 2006; RODRIGUEZ et al, 1997)
The harvest rotation age definition requires an independent analysis for each stand, even though it is connected to the production of every stand in the forestry enterprise
Summary
Extensive and well conducted industrial reforestations with Eucalyptus spp. has guaranteed the constant and regular supply of several industries that process and consume these plantations’ raw materials, in the country. The relatively low cost of implantation and correspondent maintenance of these reforestations, with a continuous wood production within a short period, allied to the excellent soilclimatic conditions within which the eucalypt grows in Brazil, have positioned the reforestation-based forest industry in the group of investment opportunities of highest competitiveness (RODRIGUEZ; DIAZ-BALTEIRO, 2006; RODRIGUEZ et al, 1997). In order to the brazilian forest industry maintain itself growing and attracting new investors, within a more globalized and competitive world, the revision and the continuous analysis of bases to important management decisions are essential (AMS, 2010). In the industrial reforestations specific case, a stand’s harvest age represents unreservedly one of the main decision variables for the correspondent forest management plans. The correct definition of the harvest age results, usually, in a complex task that must involve a coherent and complex processing of a lot of information (RODRIGUEZ et al, 1997; BUONGIORNO; GILLESS, 1987)
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