Measurements for the thesis were held in the area of OE Kočevje, area near Ribnica. The work was conducted in two areas. We focused on two tree species, which represent a major percentage of the growing stock in Slovenia. In one area we passed the felling of spruce, in another area felling beech. Altogether we cut down 30 spruce trees and 30 beech trees. We were measuring the consumption of fuel and lubricants in relation to tree species and volume of trees. The results of measurements showed that the average consumption per m3 for spruce was 197.18 ml of fuel and 92.57 ml of lubricant. For beech the consumption per cubic metre was 142.83 ml of fuel and 54.63 ml of lubricant.
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