PRODUCTIVITY AND COSTS OF FOREST CUTTING IN A PINE STAND UNDER TWO THINNING METHODS

Oscar Manuel De Jesús Vera Cabral,Afonso Figueiredo Filho,Eduardo Da Silva Lopes,Carla Krulikowski Rodrigues

doi:10.5380/rf.v50i4.66647

Oscar Manuel De Jesús Vera Cabral, Afonso Figueiredo Filho + Show 2 more

Open Access

https://doi.org/10.5380/rf.v50i4.66647

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Journal: FLORESTA	Publication Date: Sep 29, 2020
License type: cc-by

Affiliation: Universidade Estadual do Centro-Oeste

Abstract

The need for higher value-added wood products and the high cost of mechanized operations stimulate the development of new thinning methods in order to provide gains in productive capacity of forest stands. In this context, the aim of this study was to analyze the effect of two thinning methods on productivity and costs of the forest harvesting in the generation of multi‐products. The study was carried out in a 10-year-old Pinus taeda stand under to two thinning methods: TH5 (harvester, with systematic harvesting of the fifth tree row and selective in adjacent rows); and TH7 (chainsaw and harvester, with systematic harvesting of the seventh tree row and selective in adjacent rows). We determined the working cycle times, productivity, and production costs through a time and motion study, with the averages of partial and total times being compared between thinning methods by the Wilcoxon-Mann-Whitney test (α ≤ 0.05). From the obtained results, it was found that the thinning methods directly affected the harvester’s partial and total times, with the largest time obtained in the TH7 thinning method due to the need to locate previously cut trees by chainsaw, with a consequent reduction in the productivity and an increase in the production costs when compared to the TH5 method. However, despite the higher production cost, the TH7 method showed potential with the use of mechanization in all activities, making it possible to increase selective thinning and contribute to gains in forest stand quality.

Highlights

Thinning is an important silvicultural treatment in managing forest stands for commercially producing wood for multi-products
When comparing the two thinning methods, it was noted that the partial activity "searching and cutting" was greater in the TH7 method, because the harvester still needed to perform a search for previously cut trees with the chainsaw in addition to cutting trees located in the rows of trees within reach of the crane
For Bonazza (2019), selective thinning from below carried out with a chainsaw may cause the presence of trees trapped in the remaining trees due to the intensity of thinning with a higher incidence in areas with less space for tree cutting

Summary

Introduction

Thinning is an important silvicultural treatment in managing forest stands for commercially producing wood for multi-products. It is the intentional, planned, rational and judicious removal of part of the trees from the stand, seeking to manage or regulate competition among the remaining trees and add value through quality, with an expansion in possibilities for different uses and wood applications (CAMPOS; LEITE, 2017). In this sense, the mechanization of thinning operations constitutes an important innovation front, enabling numerous advantages in the forest production chain (SPINELLI et al, 2014)

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