Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2014
Authors
Kjell AndreassenAbstract
In this investigation we analyzed pairs of uneven-aged vs even-aged managed Norway spruce long term plots. The plots were established as parallel plots in 1920-1940’s and are followed by frequent measurements over a period of 50 to 90 years to get knowledge about growth, stability and forest management . The uneven-aged plots were managed with selection system, while the even-aged plots were managed with thinning from below. Diameters of all trees and heights of sample trees are measured. The diameters of harvested trees were 17 % larger than the remaining trees and indicate thinning from above. We experienced about 20 % lower volume production in the uneven-aged forest compared with the yield capacity (YC) with the largest deviation at the most productive sites (YC >9 m3/ha/yr). Selection system based on natural regeneration is favorable at vegetation types with easy regeneration conditions. We experienced problems to maintain a J-shaped diameter distribution at most sites with uneven-aged management due to too small harvesting (selection system), dense stands, and small natural regeneration. It is difficult to balance between dense productive stands and initiating natural regeneration under Norwegian conditions. However, problems with stability are also observed in even-aged stands.
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Authors
Guro BrodalAbstract
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Guro BrodalAbstract
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Authors
Asima Akagic Nermina Spaho Fuad Gasi Pakeza Drkenda Amila Vranac Mekjell Meland Besim SalkicAbstract
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