Review of studies on motor-manual felling productivity in eucalypt stands

Ghaffariyan, Mohammad Reza

doi:10.3897/silvabalcanica.22.e58750

Cited by 4 publications

(4 citation statements)

References 15 publications

(20 reference statements)

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“…In addition to the slope gradient, increasing the travel distance positively affected the production skidding unit cost. In this study, the cost ranged from USD 0.82 m −3 to USD 10.2 m −3 , respectively, for travel distances between 15 m and 186 m. The extraction distance was found to be the primary factor affecting machine productivity, consistent with results stated in some earlier studies [19,35,42].…”

Section: Discussionsupporting

confidence: 90%

“…Overall, numerous studies have addressed the ground-based skidding system, mainly focused either on felling or log extraction, worldwide, which shows the importance of the subject (for example, see [10,[13][14][15][16][17][18][19]). A large body of literature on this subject emphasizes the physical characteristics of harvesting operations (e.g., load volume per cycle, skidding distance, and tree diameter) as major factors influencing the performance of the ground-based operation [17,20].…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Weather and Slope Conditions on the Productivity, Cost, and GHG Emissions of a Ground-Based Harvesting Operation in Mountain Hardwoods

Ezzati

Tavankar

Ghaffariyan

et al. 2021

Forests

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Mountainous hardwood mixed stands offer challenges to timber harvesting operations in practice, including a harsh climate, variable topography, steep terrain, and large-sized timbers. This paper aims to develop productivity and cost models for a mountain-ground-based harvesting operation across the terrain (e.g., slope conditions), stand (e.g., tree volume) environmental (e.g., weather), and yard (e.g., winching distance) variables and to assess GHG emissions related to the equipment in use. This development was implemented in a timber harvesting practice under single-tree selection in mountainous forests of Iran where a motor-manual chainsaw is used for felling and a rubber-tired cable skidder is used for log extraction. The average delay-free productivity was 4.55 m3 for felling and 14.73 m3 h−1 for skidding. Lower production costs and higher productivity rates were observed over the gentle slopes and in sunny conditions. The average production costs ranged between USD 4.27 m−3 for felling and USD 5.35 m−3 for skidding. The average emissions ranged between 0.96 kg m−3 for felling and 7.06 kg m−3 for skidding in snowy conditions over steep slopes. The study’s results confirm avoiding harvesting operations on steep slopes (greater than 35%) and in extreme weather conditions to obtain higher work efficiency and to minimize adverse effects of machinery on forest ecosystems. The results should be of use to harvest managers and forest planners considering the application of ground-based harvesting operations using a semi-mechanized system on a range of operating conditions in mountain hardwood stands.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

The Impact of Weather and Slope Conditions on the Productivity, Cost, and GHG Emissions of a Ground-Based Harvesting Operation in Mountain Hardwoods

Ezzati

Tavankar

Ghaffariyan

et al. 2021

Forests

Self Cite

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“…The most time-consuming work element was moving time (60%), followed by cutting time (29%) and bunching time (11%). The results indicated that the average productivity of the feller-buncher was estimated as 74.96 m 3 /h which is much higher than the productivity of conventional tree cutting methods (Câmpu & Ciubotaru 2017, Aruga et al 2019, Ghaffariyan 2021. Table 2 shows the descriptive statistics of all variables.…”

Section: Resultsmentioning

confidence: 99%

Analysis of a feller-buncher productivity: a case study of whole-tree harvesting from Marmara region, Turkey

Gülci

Yüksel

Gülci

et al. 2021

AFR

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In fully mechanized forest harvesting systems, tree felling activities are mostly performed by using harvesters or feller-bunchers. In some regions of Turkey, where terrain conditions and stand characteristics are suitable, fully mechanized harvesting systems have been recently practiced by some of the logging contractors as private forest industry demands for large amounts of forest products throughout the year. Thus, performances of these newly practiced harvesting systems should be carefully analyzed in order to implement productive and cost-effective mechanized harvesting systems. In this study, productivity of whole-tree harvesting using a feller-buncher was investigated based on stand parameters including tree height, DBH, and volume. The DBH of the felled trees were divided into four classes (i.e. very small: 16-19 cm, small: 20-23 cm, medium: 24-27 cm and large: 28-31 cm) to investigate the effects of various DBH class on the time consumption of cutting stage and productivity of the feller-buncher. To estimate productivity of feller-buncher in harvesting operation, multiple linear and polynomial regressions were also developed and discussed after the interpretation of diagnostic plots. The results indicated that the average productivity of the feller-buncher was 74.96 m3 /h which was closely related with tree height (r = 0.63), DBH (r = 0.67), and volume (r = 0.67). The average moving time was the most time-consuming stage (60%), followed by cutting (29%) and bunching stages (11%). It was found that DBH classes caused statistically significant (p < 0.05) effects on the time spent on cutting stage and productivity of the feller-buncher. The cutting time and productivity increased from very small to large diameter classes, while bunching time increased from very small to small diameter and then medium diameter to large diameter classes. Polynomial regression had a positive impact on the performance of the estimation model of manually field-measured data based on the error parameters.

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“…Research on chainsaw damage has been carried out in Romania [13], and research about felling productivity [14,15], felling productivity and cost estimation [16,17,18]. Hinge shape on chainsaw felling direction [19].…”

Section: Discussionmentioning

confidence: 99%

Chainsaw part damage of harvesting teak forest in Madiun East Java, Indonesia

Matangaran¹,

Priyonggo²

2022

GSC Adv. Res. Rev.

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Forest harvesting has to be a concern for productivity, the operator's safety, and the environmental impact of forest harvesting. Chainsaw is commonly used for forest harvesting in Java, Indonesia. To increase the harvesting productivity, the operator has to maintain their chainsaw. Part of the chainsaw is often damaged in the harvesting process, affecting the productivity of felling the trees. This study analyzes the damage to parts from chainsaws in teak forest harvesting. The research location was in a forest area of Perhutani Company in Madiun East Java. The result shows that all ten chainsaws had damage to their parts components. The piston was the engine component which damaged in all the ten chainsaws. The body components such as the front handle, muffler, and on-off switch were damaged by all ten chainsaws. We observed that the chainsaw operator could not maintain the chainsaw well.

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Review of studies on motor-manual felling productivity in eucalypt stands

Cited by 4 publications

References 15 publications

The Impact of Weather and Slope Conditions on the Productivity, Cost, and GHG Emissions of a Ground-Based Harvesting Operation in Mountain Hardwoods

The Impact of Weather and Slope Conditions on the Productivity, Cost, and GHG Emissions of a Ground-Based Harvesting Operation in Mountain Hardwoods

Analysis of a feller-buncher productivity: a case study of whole-tree harvesting from Marmara region, Turkey

Chainsaw part damage of harvesting teak forest in Madiun East Java, Indonesia

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