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Single-tree and Group Selection in Montane Norway Spruce Stands: Factors Influencing Operational Efficiency

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The operational efficiency of single-tree and group selection with a single-grip harvester was studied in uneven-aged spruce forests at high altitudes in southern Norway. Three harvest intensities of single-tree selection and two group sizes were examined in group selection. Single-tree selection included harvest intensities of 25, 45 and 65% of basal area. Group sizes for group selection were 0.063 and 0.250 ha. Normally, single-tree selection is considered less efficient than group selection or clear-cutting. In this study, because time consumption per cubic metre was primarily dependent upon average harvested tree volume, the large harvested tree size for single-tree selection allowed this treatment to be more efficient than group selection. The two blocks in this study were part of a larger design of five blocks with identical treatments under varying stand conditions. The relative operational efficiency of single-tree selection compared with group selection was greatest in stands of low stocking. Other studies have also shown that mechanical damage to the residual stand is lowest under these conditions.
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Document Type: Research Article

Affiliations: 1: Department of Forestry, Danish Forest and Landscape Research Institute, DK-2970 Hørsholm, Denmark 2: Department of Forest Operations, Economics and Products, Norwegian Forest Research Institute, N-1432 Ås, Norway

Publication date: 2001-01-01

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