Förröjning i förstagalling - vad kostar det och följer utförarna instruktionerna?
This report is a B.Sc. Forestry thesis work at the school for Forest Management, SLU.
The work was an assignment from the forest owners? association Mellanskog.
The aim of the work where to investigate the economical result of removing undergrowth trees before first thinning, and a follow-up of the contractors and their compliance with Mellanskog standards.
This thesis work was divided in three parts: The first was to find a relation between the net volume from the first thinning and the cost of cleaning undergrowth trees. Secondly there was a follow-up in the field, to investigate whether the contractors have done the undergrowth cleaning according to Mellanskog?s directives. The last part of the assignment was an inquiry examination to both thinning machine contractors and cleaning contractors, including interviews with some of them.
One hypothesis, which we shared with our assigner (Mellanskog), was that all contractors didn`t follow the directives. According to the directive all obstructive undergrowth up to 8 cm diameter in breast height (1,3 meters above the ground) should be removed. Trees with a breast height diameter