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http://dx.doi.org/10.14578/jkfs.2015.104.2.221

Harvesting Cost of Tree-length Thinning in a Larix leptolepis Stands  

Cho, Koo-Hyun (Forest Practice Research Center, Korea Forest Research Institute)
Cho, Min-Jae (Department of Forest Management, Kangwon National University)
Han, Han-Sup (Department of Forestry and Wildland Resources, Humboldt State University)
Han, Sang-Kyun (Department of Forestry and Landscape Architecture, Korea National College of Agriculture and Fisheries)
Cha, Du-Song (Department of Forest Management, Kangwon National University)
Publication Information
Journal of Korean Society of Forest Science / v.104, no.2, 2015 , pp. 221-229 More about this Journal
Abstract
The purpose of study was to broaden our knowledge on the productivity and cost of thinning operations which has become increasingly practiced in Korea. The thinning operations were conducted in a 40-year old larch (Larix leptolepis) stand, including chainsaw felling and processing at the stump, followed by yarding tree-length logs using a Koller K301-4 tower yarder. The logs were further processed and sorted into 1.8 m and 3.6 m log piles at the landing. We used a standard time study method to evaluate key variables that affect the productivity of thinning operations. The total stump-to-pile operational cost was $41,707won/m^3$. The highest cost activity was the yarding phase which cost $20,083won/m^3$ (48.2% of the total cost), followed by the costs of processing treelength materials into marketable log lengths ($12,143won/m^3$; 29.1%), and then by the costs of sorting/piling the processed logs ($5,039won/m^3$; 12.1%). It was interesting to see that felling and processing trees at the stump had low costs at $1,315won/m^3$ (3.2%) and $3,127won/m^3$ (7.5%), respectively. We used the detailed time study data to develop regression equations which were to predict yarding productivity. Our analysis showed that harvesting system cost was highly sensitive to the number of logs, yarding distance and lateral distance per turn, respectively.
Keywords
skyline thinning; harvesting system productivity and cost; yarding distance; the number of logs in yarding;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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