Prestationspåverkan av flerträdshantering i klena gallringar
The aim of this study is to investigate how multiple tree handling harvesters perform compared to earlier developed standards. The study shows that multiple tree handling harvesters are more efficient in thinnings stands with mean stock volumes less than 0,12 m3fub per stock. The increased efficiency is different for different mean stem classes. In stands with a mean stem volume of 0,04 m3fub per stock, the increase can be as high as 40 percent while it is about 10 percent in stands with a mean stem volume of 0,12 m3fub.
Comparisons have been done between stands that are felled with partly limbed stands and stands without partly limbed assortments. The difference in performance is clear and shows that the partly limbed assortments strengthen the multiple tree handling harvesters positive effects in low dimension thinnings. In stands that are partly limbed and have a mean stem volume of 0,04 m3fub per stem the efficiency has increased with about 65 percent, at the same time the increase in not partly limbed stands with the same mean stem volume was just about 20 percent.
The effect of method training that some entrepreneurs have done has been analyzed on machines with drivers who have completed the training. The result shows that the method trained drivers increased their performance after the training.
This study has been done in cooperation with Sydved AB. The study has been done during the summer of 2011 and is based on fellings mostly performed during 2010 and 2011.