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
Forfattere
Jan Reent Koster Lars Molstad Peter Dörsch Audun Korsæth T. Lien Øyvind Overskeid Trygve Utstumo Lars BakkenSammendrag
No abstract has been registered
Sammendrag
No abstract has been registered
Sammendrag
No abstract has been registered
Sammendrag
In order to safeguard biodiversity in forest we need to know how forest policy instruments work. Here we use a nationwide network of 9400 plots in productive forest to analyze to what extent large-scale policy instruments, individually and together, target forest of high conservation value in Norway. We studied both instruments working through direct regulation; Strict Protection and Landscape Protection, and instruments working through management planning and voluntary schemes of forest certification; Wilderness Area and Mountain Forest. As forest of high conservation value (HCV-forest) we considered the extent of 12 Biodiversity Habitats and the extent of Old-Age Forest. We found that 22% of productive forestarea contained Biodiversity Habitats. More than 70% of this area was not covered by any large-scale instruments. Mountain Forest covered 23%, while Strict Protection and Wilderness both covered 5% of the Biodiversity Habitat area. A total of 9% of productive forest area contained Old-Age Forest, and the relative coverage of the four instruments was similar as for Biodiversity Habitats. For all instruments, except Landscape Protection, the targeted areas contained significantly higher proportions of HCV-forest than areas not targeted by these instruments. Areas targeted by Strict Protection had higher proportions of HCV-forest than areas targeted by other instruments, except for areas targeted by Wilderness Area which showed similar proportions of Biodiversity Habitats. There was a substantial amount of spatial overlap between the policy tools, but no incremental conservation effect of overlapping instruments in terms of contributing to higher percentages of targeted HCV-forest. Our results reveal that although the current policy mix has an above average representation of forest of high conservation value, the targeting efficiency in terms of area overlap is limited. There is a need to improve forest conservation and a potential to cover this need by better targeting high conservation value areas.
Forfattere
Kjell AndreassenSammendrag
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.
Sammendrag
No abstract has been registered
Sammendrag
No abstract has been registered
Forfattere
Guro BrodalSammendrag
No abstract has been registered
Forfattere
Guro BrodalSammendrag
No abstract has been registered
Sammendrag
No abstract has been registered