Análise comparativa da colheita florestal em regime de alto fuste e talhadia

Abstract

In the forestry companies is common the discussion that in the harvest in coppice regime occurs losses in machines productivity, although the works in the literature are very scarce to prove such a claim. The objective of this work was to perform a comparative analysis of mechanized forest harvesting in the area of tall trees and coppice management regime, analyzing the technical parameters of forest lanyard ("harvester"), along with the influence of lateral budding for forest harvesting and machine productivity gains in different average volumes harvested tree. The survey was conducted in a forestry company in the county of Aracruz, Espirito Santo. Four treatments were performed, namely: coppice with lower productivity with lateral budding, coppice higher productivity without lateral budding, coppice lower productivity without lateral budding, and tall trees, with lower productivity. Four machines of the same model were used, with the same operators for four working days in each treatment, always in the first round, a total of 16 repetitions for each treatment. The comparison of means was performed using the t test, at the 5% level of probability and box plot was used for analysis of dispersion and asymmetry of the data. According to the results, there was no influence of lateral sprouting in machine productivity, but the difference in number of chain falls during harvest with side shoots is significant (2.86 times higher). No difference was observed between the productivity of the machine in coppice management regime and tall trees, however, the number of chain falls to harvest coppice is statistically different (1.59 times higher). Increased productivity plot caused an increase in machine productivity, with no statistical difference between the number of a power failure by volume processed in areas with different productivity of the field.