Productivity and cost of manual felling with a chainsaw in Caspian forests

Behjou, Farshad Keivan; Majnounian, Baris; Dvořák, Jiří; Namiranian, M; Saeed, Aharizad; Feghhi, J

doi:10.17221/69/2008-jfs

Cited by 26 publications

(22 citation statements)

References 6 publications

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“…The stump diameter and walking distance are the most significant variables affecting the felling time, corresponding to the findings of Kleunder and Stokes (1994), Lortz et al (1997), Wang et al (2004) and Behjou et al (2009). There are some difficulties in controlling the brush saw when felling trees, as the workers do not have as much control of the saw as compared to a chainsaw.…”

Section: Fellingsupporting

confidence: 54%

Harvesting operations in eucalyptus plantations in Thailand

Manavakun¹

2014

Diss. For.

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To be presented with the permission of the Faculty of Agriculture and Forestry of the University of Helsinki for public criticism in the Walter Auditorium of the EEbuilding (Agnes Sjöbergin katu 2) on May 28 th , 2014, at 12 o'clock noon. ABSTRACTThe eucalyptus has recently become an important timber species in Thailand, particularly in relation to timber supply within the pulp industry. Demand for raw material is continuously increasing, but harvesting techniques continue to rely on old-fashioned methods of harvesting, which are motor-manual and labour-intensive operations. These harvesting operations typically provide relatively low productivity and are time consuming. This study addressed the timber harvesting potential in Thailand including: average productivity, identifying ineffective work phases, and how work performance can be improved. Therefore, the study was conducted to analysis existing timber harvesting systems as a whole and compare alternatives, and to explore improvements in forest harvesting systems in Thailand through work study, working postures analysis, and simulation. Work study allowed the researcher to understand in detail the conventional harvesting systems and obtain information regarding work activities and time allocations. Harmful tasks and awkward working postures were evaluated by working posture analysis. Simulation allowed the researcher to examine the impact of changing harvesting systems. The study confirmed that motor-manual operations have rather low production rates compared to intermediate and fully mechanized harvesting techniques, which are applied in other parts of the world. The most unproductive work phase is cross-cutting, and further research should pay attention to this work phase. According to the working postures analyses, the most problematic working postures found for manual tasks included stacking, delimbing, and loading. Simulation findings suggested that reorganization of job sequences is one major possibility for improving productivity. Log length and tree size also displayed a significant effect on overall productivity. Further research should consider enhancing the system with partial mechanization, such as farm tractors, skidders and multi-tree-handling harvesters. Education and training are also important measures to increase not only work performance, but also to improve work safety.

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Section: Fellingsupporting

confidence: 54%

Harvesting operations in eucalyptus plantations in Thailand

Manavakun¹

2014

Diss. For.

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“…As a result, a multiple linear model where the independent variables were sd and d was used in estimating Teff. The determination coefficient (R 2 = 0.65 in S1 and R 2 = 0.58 in S2) shows that 58-65% of Teff variation is due to sd and d. Behjou et al (2009) used variables dbh and d in a linear model and obtained a determination coefficient R 2 = 0.84.5. Besides independent variables sd and d, Teff is influenced in proportion of 35-42% by other factors mentioned by literature in the field.…”

Section: Discussionmentioning

confidence: 97%

“…Besides independent variables sd and d, Teff is influenced in proportion of 35-42% by other factors mentioned by literature in the field. Thus, Tdepl is influenced by stand density, harvesting intensity (Wang et al 2004) and slope between two harvested trees (Behjou et al 2009;Mousavi et al 2011). Steep terrain makes operators' movement and felling more difficult than in the case of gentle terrain.…”

Section: Discussionmentioning

confidence: 99%

Time consumption and productivity in manual tree felling with a chainsaw – a case study of resinous stands from mountainous areas

Câmpu¹,

Ciubotaru²

2017

Silva Fenn.

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Highlights• An important preoccupation in sustainable logging management is represented by the analysis of work time structure and productivity level in manual tree felling with a chainsaw.• Sound knowledge of the factors which influence work time allows better planning of harvesting operations so that deadlines could be met and damage to forest ecosystems be minimized. AbstractThe purpose of this research is to establish time consumption and productivity when using Husqvarna 365 chainsaw for resinous tree felling in mountainous regions. The research was conducted in the Romanian Southern Carpathians, in two mixed spruce (Picea abies (L.) H. Karst.) and fir (Abies alba Mill.) tree stands (S1 and S2). Only one team of workers, made up of a feller and an assistant, was used in the felling operation. This was divided into nine specific stages for which work times were measured. Work time structure used here includes WP -workplace time (PW -productive work time; SW -supportive work time, NT -non-work time) and NW -non-workplace time. The results indicated a productivity of 10.138 m 3 h -1 (4.55 tree h -1 ) in S1 and of 11.374 m 3 h -1 (4.33 tree h -1 ) in S2. Work time structure was WP 88.61% (PW 19.59%; SW 33.88%; NT 35.14%) and NW 11.39% in S1 and WP 83.77% (PW 17.66%; SW 30.73%; NT 35.38%) and NW 16.23% in S2. The results obtained showed that the power function best describes the relationship between productivity expressed by tree h -1 and breast height diameter (dbh) (R 2 = 0.89 in S1 and R 2 = 0.94 in S2). When productivity is expressed by m 3 h -1 the results obtained in the case of power, exponential and linear functions are comparable (R 2 = 0.65 to 0.67 in S1 and R 2 = 0.81 to 0.92 in S2). Productivity is also influenced by stump diameter and the distance between trees. Their influence on productivity was emphasized by linear regression equations.

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“…Therefore, one of the important issues in harvesting operations is the amount of wood which may be potentially lost due to the use of certain equipment or operational procedures. While the level of mechanization differs from region to region depending on forest types, wood species, management methods, terrain, and climatic conditions (Vusić et al 2013), the use of motor-manual tree felling is still very common in Europe (Brachetti Montorselli et al 2010;Gerasimov and Seliverstov 2010;Zinkevicius et al 2012;Borz and Ciobanu 2013) and around the world (Wang et al 2004;Behjou et al 2009;Mousavi et al 2011;Balimunsi et al 2012;Ghaffariyan et al 2013;Jourgholami et al 2013;Nikooy et al 2013). On the one hand, it is well known that by using a chainsaw in tree felling operations, a certain quantity of wood would be lost as a consequence of the cuts performed in order to fell the tree (Oprea and Sbera 2004).…”

Section: Introductionmentioning

confidence: 99%

Small Gains in Wood Recovery Rate when Disobeying the Recommended Motor-Manual Tree Felling Procedures: Another Reason to Use the Proper Technical Prescriptions

Borz¹,

Ignea²,

Vasilescu³

2014

BioResources

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An efficient wood harvesting activity aims to fully recover wood as a measure to increase the profit, but safety prescriptions should be obeyed each time when harvesting operations are performed. A study was carried out in three forest compartments in order to determine whether the actual tree felling procedures match the recommended ones and, if not, to compare how the used practices may affect the wood recovery when felling trees using a conventional undercut. The study yielded significant statistical differences between the recommended and used cuts dimensions, as well as significant differences between the procedures used by three studied work teams. The general trend was to make deeper cuts and smaller openness when performing undercuts. Since one reason for such tree felling procedures may be the increment of wood recovery rate, we conducted a comparative analysis between the potential volume loss in the two mentioned scenarios, and only small differences were found; this should discourage the use of such tree felling techniques. The present estimates suggest that the potential volume loss was 0.89 to 1.20% of the harvested volume, yielding small gains in terms of wood recovery if compared to that of 1.74 to 3.17% corresponding to the recommended practices.

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Productivity and cost of manual felling with a chainsaw in Caspian forests

Cited by 26 publications

References 6 publications

Harvesting operations in eucalyptus plantations in Thailand

Harvesting operations in eucalyptus plantations in Thailand

Time consumption and productivity in manual tree felling with a chainsaw – a case study of resinous stands from mountainous areas

Small Gains in Wood Recovery Rate when Disobeying the Recommended Motor-Manual Tree Felling Procedures: Another Reason to Use the Proper Technical Prescriptions

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