Productivity and costs of harvester cutting of teak trees for thinning

Acosta, Fidel Cándano; Silva, Igor Martins; Garcia, Marcos Leandro; Melo, Rafael Rodolfo de

doi:10.1590/2179-8087-floram-2020-0002

Cited by 2 publications

(1 citation statement)

References 20 publications

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“…Teak forest plantations require scientific support for decision making, including that in the form of predictive models, mainly because there is limited research on operational performance [1,11] which in turn affects other important management processes such as cost estimation, operational optimization and timing. These models may be developed either by running resource intensive time studies, which should cover the variation in operational conditions, or by using highly detailed data provided by state-ofart technologies, with the aim to simulate the effect of operational conditions on the variation in time consumption and productivity.…”

Section: Introductionmentioning

confidence: 99%

Modelling Productivity in Extraction Operations by Simulations Based on GNSS Documented Data: An Example from Skidding Teak Wood In Thailand

Kaakkurivaara

Ketkaew

et al. 2022

FWIAFE

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In Thailand, teak harvesting always includes skidding of tree-length stems from the landing to the log yard for further processing. When terrain does not set limitations for the machines to be used, skidding is carried out by farm tractors. In this study, data was collected from 10 work cycles of teak extraction to simulate the productivity of farm tractors. The GNSS data as speed and locations were used to extract operational distances and time consumption, as well as to support productivity simulation. For this, detailed measurements were done on the extracted stems to collect their diameters and lengths. For approximately six stems per load, the mean load size was 1.723 m3. The study found that mean productivity was 17.4 m3/h during the survey, where the mean extraction distance was 217 m. Our simulation presents productivity diagrams in relation to skidding distance. By simulation, we detected that reducing the full operational speed by 1 km/h would decrease productivity by 1 m3/h when the extraction distance is less than 100 m. Another observation was that even small reductions in load sizes have a remarkable effect on productivity over short distances. Until large-scale studies are to be done to evaluate productivity in relation to variations in load size and extraction distance, the results shown herein could stand as a basis for productivity assessments.

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Section: Introductionmentioning

confidence: 99%

Modelling Productivity in Extraction Operations by Simulations Based on GNSS Documented Data: An Example from Skidding Teak Wood In Thailand

Kaakkurivaara

Ketkaew

et al. 2022

FWIAFE

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Intercropping Short Rotation Timber Species with Teak: Enabling Smallholder Silviculture Practices

Sudomo

Maharani

Swestiani

et al. 2021

Forests

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Community forest management for timber production requires short- and long-rotation companion species to fulfill the demands of the timber industry, improve farmer welfare and maintain environmental sustainability. Four species (Falcataria moluccana, Neolamarckia cadamba, Acacia mangium and Gmelina arborea) were tested as short-rotation timber crop companion species for teak (Tectona grandis) on dry-rocky soil in the Gunungkidul community forest. The selection of short-rotation timber species was based on growth performance and survival rate at the teak site. Two years after planting, the viability of G. arborea (87.3%) and A. mangium (78.2%) was significantly (p < 0.05) higher than that of N. cadamba (40.6%) and F. moluccana (18.0%). G. arborea and N. cadamba achieved the best growth in terms of height, diameter, basal area, and volume, with the growth of A. mangium and F. moluccana being significantly inferior. Gmelina arborea has the ability to adapt to teak sites, grow well, and accompany teak. Neolamarckia cadamba demonstrated good growth with potential as a teak companion, and it demonstrated limited drought tolerance on the dry-rocky soils of the study sites. Acacia mangium had a high survival but produced slow growth, indicating that it required an advance evaluation in future years. Falcataria moluccana has different growing site requirements to teak so the performance was relatively poor at the study site. This mixed pattern provides benefits to farmers through commercial thinning of short rotations species, 5–8 years post establishment. Thinning operations will also increase the productivity of residual teak stands. The diversification of timber species in community forests can provide earlier returns, enabling the adoption of silviculture management by smallholders and communities.

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Productivity and costs of harvester cutting of teak trees for thinning

Cited by 2 publications

References 20 publications

Modelling Productivity in Extraction Operations by Simulations Based on GNSS Documented Data: An Example from Skidding Teak Wood In Thailand

Modelling Productivity in Extraction Operations by Simulations Based on GNSS Documented Data: An Example from Skidding Teak Wood In Thailand

Intercropping Short Rotation Timber Species with Teak: Enabling Smallholder Silviculture Practices

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