CONICET | Buscador de Institutos y Recursos Humanos

At present the productivity of forrwarders in harvesting operation has increased. However operation costs have also increased accordingly, requiring the accurate predictions of the operations results and productivities. The aim of this study is to develop productivity models for forwarders working in thinning operations, comparing slope and flat terrain in the Northeast of Argentina. For the development of the models, time consumption studies were carried out based on the filming the operations by video cameras and tracking by GNSS systems. It was possible to fit a linear mixed model to predict productivity for forwarder in thinnig operations, this model explain up to 72% of the productivity. From the productivity model, optimal road densities were determined for three types of roads at each site: primary, secondary and skid roads. In both sites most of the forest roads were at sub-optimal road density values, indicating that the density could be increased, or that the existing roads could be improved without affecting operating costs. In this work it was possible to demonstrate that at optimum road densities allows to reduce costs for about 39-54% for slope sites and between 26-32% for flat sites. This results can be explained by the high productivity of the forwarders, the low costs of logging operations, and the low road constuction and maintance cost in the Northeast Argenina .

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