Influência do valor da madeira de mercado sobre o ordenamento de florestas plantadas para o suprimento parcial de uma indústria de celulose e papel: uma aplicação da programação linear. / Influence of the market wood value on the management of planted forests partially supplying a pulp mill: an application of linear programming.

AUTOR(ES)

Fábio Luís Brun

DATA DE PUBLICAÇÃO

2002

RESUMO

Generally, the Brazilian pulp industry wood supply is largely provided by planted forests owned by the companies and wood purchased in the market. Long term planning programs usually address the two supplying sources – fee forests and market wood -separately. The main objective of this study is to assess the impact of different wood acquisition value scenarios in linear programming models that consider the amount of purchased wood as one of the variables. Based on data of 155 Production Units supplied by International Paper do Brasil Ltda., a printing paper company located in Mogi-Guaçu, State of São Paulo, the study presents results from the generation of 80 linear programming models submitted to five different wood acquisition value scenarios. The approach was divided into: maximization of net present value and minimization of the present cost, divided into Global and Regionalized models (pertaining to a company administrative restriction), with regulated or floating production and submitted or not to operational restrictions as a maximum harvesting area. Results allow observing that the different modeling approaches show different degrees of sensitivity to variations in the wood acquisition value – notably the minimization models. That sensitivity can be measured against variations in the harvesting and wood purchase programs, the floatation of the average harvesting ages, results of the objective function values and the percentage of utilization of fee lands. Results also suggest that there are advantages in managing the forest through the Global model, not considering the actual administrative limitations. Also, the maximization approach is the preferred one once it demonstrates more robustness through the generation of management programs less sensitive to the different proposed wood acquisition value scenarios.

ASSUNTO(S)

indústrias de celulose e papel wood valor (economia) economic value madeira mercado agrícola pulp and paper industry forest regulation ordenamento florestal agricultural market

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