Productivity and cost analysis of manual felling and skidding in Oriental spruce (Picea orientalis L.) forests

Caliskan E.

ANNALS OF FOREST RESEARCH, vol.55, no.2, pp.297-308, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 55 Issue: 2
  • Publication Date: 2012
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.297-308
  • Karadeniz Technical University Affiliated: No


Cost and productivity are major factors when considering which type of harvesting system to operate. Observations were conducted on felling and skidding harvesting operations, in the Blacksea region of Turkey, Pasakonagi spruce forest sites, in order to obtain time study data. The performance of the Stihl chain saw, forest tractor (MB Trac900) skidder was studied for log methods. Production and cost analysis were conducted on the harvesting system data in order to compare the two systems. The productivity and gross-effective productivity of chainsaw for different diameters were 9.11 m(3)/hour/man and 10.6 m(3)/hour/man respectively. The unit costs with and without delay times were 1.30 $/m(3) and 1.11 $/m(3), respectively. The significant variables included diameter at breast height and distance among harvested trees for the time expenditure model. This regression function is statistically significante at a level of 5%. The productivity and gross-effective productivity of forest tractor skidding for different diameters were 11 m(3) and 10.43 m(3) per hour, respectively. The unit cost per cubic meters was 3.81 $ for the with delay times while the unit cost without delay times was 3.54 $ per cubic meter. The significant variables included skidding distance, number of logs, and volume for the time expenditure model. This regression function is statistically significance level of 5%. Result of this research can be also useful for in harvesting planning.