Quality in forest cutting operation in stands under two models of mechanized thinning
DOI:
https://doi.org/10.4336/2019.pfb.39e201801689Keywords:
Pinus taeda, Log, Mechanical harvestingAbstract
Technological evolution of wood harvesting machines has allowed the expansion of selective thinning areas in forest stands, with gains in productivity, but with risks to affect the work quality. In this context, the aim of this study was to evaluate the quality of harvesting operation in Pinus taeda stands under two thinning models: (1) systematic cutting of the fifth line and selective in adjacent lines, and (2) systematic cutting of the seventh line and selective in adjacent lines. Quality was evaluated by measuring stump height and logs length in assortments saw log, veneer log, and pulpwood. The values were analyzed by means of histograms and the averages were compared by pre-established dimensions through Wilcoxon´s test (α ≤ 0.05). It was verified that 90% of stump heights were above pre-established value, with means of 12.5 and 12.9 cm, resulting in wasted wood volume of 0.50 and 0.62 m3 ha-1 in thinning models 1 and 2, respectively. Length of saw log and veneer log in both thinning models were higher than expected, while values for pulpwood showed significant lower values when compared to the pre-established.
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