Efeito De Variáveis Operacionais Na Produtividade De Um Harvester De Pneus No Desbaste De Pinus

Lopes, Eduardo da Silva; Oliveira, Felipe Martins de; Roza, Bruna Letícia

doi:10.5380/rf.v47i4.51112

Cited by 5 publications

(5 citation statements)

References 7 publications

(9 reference statements)

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“…This variation in time occurred due to the need to separate the logs into stacks for sawn logs, veneer logs and fuel wood caused by the presence of a greater quantity of larger trees. Such results were also described by Lopes et al (2017) when assessing the harvester in the thinning operation of Pinus spp. under different topographic conditions, finding that the wood processing is affected by the need to produce different assortments.…”

Section: Discussionsupporting

confidence: 62%

Productivity and Costs of Forest Cutting in a Pine Stand Under Two Thinning Methods

Cabral¹,

Lopes

Rodrigues

et al. 2020

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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.

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Section: Discussionsupporting

confidence: 62%

Productivity and Costs of Forest Cutting in a Pine Stand Under Two Thinning Methods

Cabral¹,

Lopes

Rodrigues

et al. 2020

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“…ISSN eletrônico 1982 10.5380/rf.v50 i3. 64331 1553 thinning, in addition to contributing to a long operating cycle time and reduced productivity (LOPES et al, 2017). This situation also applied in this study, given the similarities between the experimental areas of both studies.…”

Section: Discussionmentioning

confidence: 93%

Damage Caused by a Wheeled Harvester to the Residual Trees of a Pinus Stand in the First Mechanized Mixed Thinning

Diniz

Oliveira²,

Timofeiczyk

et al. 2020

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The objective of this study was to evaluate the damage caused to the remaining trees of a pinus stand submitted to mechanized thinning by a wheeled harvester. The data were obtained in the operational areas of timber harvesting in a forest company located in the city of Inácio Martins, in the state of Paraná, Brazil. The Pinus stand of the study was 11 years old, and was submitted to the first commercial thinning. The operation was performed by a harvester, characterized by the systematic removal of the 5th planting line to give access to the interior of the stand, followed by selective thinning in the individuals demarcated in the two lines adjacent to the traffic trails. The damage caused to the remaining trees of the stand regarding their numbers, dimensions and location in relation to the harvester’s operation track was evaluated, and the data were analyzed using the Profile Analysis multivariate analysis technique. It was observed that 25% of the remaining trees suffered some kind of damage, being considered a high value, but current to the literature. It was evidenced that the section of the tree in need of greater alert was the base because damages in greater intensity and dimensions were observed to it, which can bring future losses to the stand. Thus, a need for improvements in operational procedures was demonstrated.

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“…When investigating mechanized thinning performed on the 4 th and 7 th lines using a harvester with tires, Mac Donagh et al (2013) also identified difficulties in this second model, since the machine did not reach all lines and needed to perform additional maneuvers to complete the operation. When studying the operational variables in Pinus thinning in southern Brazil in a similar model to T2, Lopes et al (2017) concluded that the reduced space inside the stand and the systematic thinning in the 7 th planting line affected the machine's reach to cut the trees in the selective thinning, as well as contributing to a high operational cycle time and reduced productivity.…”

Section: Discussionmentioning

confidence: 99%

Damage Caused to the Remaining Trees of a Pinus Stand Submitted to Two Mechanized Thinning Models

Cabral

Lopes

Fiedler

et al. 2018

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The objective of this study was to evaluate the damage to remaining trees of pine stand submitted to two models of mechanized thinning. Data were collected in the wood harvesting areas of a forest company in Southern Brazil during the first commercial thinning with 10-year-old trees. The thinning was executed by a harvester in cutting the trees and a forwarder in extracting the logs, which was defined by thinning in the 5th planting line (treatment T1); and by a chainsaw in felling the central trees, by a harvester in cutting the other lines, and by a forwarder in extracting the logs in the experimental area defined by thinning in the 7th planting line (treatment T2). The damage to remaining trees in the stand in relation to the dimensions and location of the machinery operating trail was evaluated, and data were analyzed through descriptive statistics. The results showed that treatment T2 caused greater damage in the remaining trees due to greater handling of felled and processed trees and a higher concentration of wood piles in the operating trail of the machines. In addition, there was greater contact of the harvester with the remaining trees when searching for the trees felled by the chainsaw was conducted to perform the final processing. Treatment T1 proved to be more suitable for thinning pine stands.

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Efeito De Variáveis Operacionais Na Produtividade De Um Harvester De Pneus No Desbaste De Pinus

Cited by 5 publications

References 7 publications

Productivity and Costs of Forest Cutting in a Pine Stand Under Two Thinning Methods

Productivity and Costs of Forest Cutting in a Pine Stand Under Two Thinning Methods

Damage Caused by a Wheeled Harvester to the Residual Trees of a Pinus Stand in the First Mechanized Mixed Thinning

Damage Caused to the Remaining Trees of a Pinus Stand Submitted to Two Mechanized Thinning Models

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