Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
1999
Forfattere
M. Haapanen J. Mikola S. Ruotsalainen M. VenäläinenSammendrag
Det er ikke registrert sammendrag
Forfattere
D. Lindgren Tim J. Mullin Y.Q. ZhengSammendrag
Det er ikke registrert sammendrag
Forfattere
Sharon FriedmanSammendrag
Det er ikke registrert sammendrag
Forfattere
Ulrik Bräuner NielsenSammendrag
Det er ikke registrert sammendrag
Forfattere
Albert WinsentsSammendrag
Describes results of a comparison of logging with running skylines on low bearing capacity terrain and typical skyline terrain in Norway. Study addresses technical issues of the same growing concern to minimize logging impact on sensitive terrain. Study also describes use of running skylines over special intermediate supports. Future research needs for mobile tailholds and supports, plus mechanized harvesting opportunities are suggested.
Forfattere
Tore SkrøppaSammendrag
Det er ikke registrert sammendrag
Forfattere
O.A Rognli V Alm C BussoSammendrag
Meadow fescue (Festuca pratensis Huds.) is one of the major fodder grass species of Northern Europe. It is also a very interesting species since hybridize with perennial ryegrass (Lolium perenne L.), the dominating grass species in Europe. There is a great interest in Europe to develop new hybrid cultivars (Festulolium) that combine the high fodder quality of Lolium with the generally higher stress-tolerance of Festuca. This was the background for our interest in developing molecular markers and agenetic linkage map in meadow fescue. These will be essential tools in modern fodder crop breeding.
Forfattere
I. Nordal K.B. Haraldsen Åshild Ergon A.B. EriksenSammendrag
Copper mine populations of Lychnis alpina are shown to be significantly more resistant to increased copper concentrations compared to populations on normal soils. Data obtained from isozyme polymorphism analysis revealed that although the copper populations display considerable variation, they have lower genetic variability than the populations from normal soils, both on a local and a global scale, thus indicating a slight founder effect. Copper ecotypes in L. alpina have originated independently. The results are similar to what recently have been reported in heavy metal tolerant populations of Armeria maritima
Forfattere
Svein SolbergSammendrag
Relationships within stands between growth and crown condition are presented. The data set contained about 25000 trees on 500 plots. Growth of single trees was determined by diameter measurements in 1991 and 1996. Diameter increments were recalculated to relative values in two steps; firstly relative to their stem diameter, and secondly relative to reference values for trees in the same plot, having no defoliation or no discoloration. These relative increment values, or growth indices, were distributed on a scale common for all plots, rendering them influenced neither by site and stand properties, nor by social status of each tree. The correlation between crown condition and growth, although of moderate strength, did validate crown condition assessments as a meaningful, but rough measure of forest health or vigour. The relationships were concave, and considerable growth depressions were already found at slight levels of defoliation and discoloration. Growth approached zero as defoliation and discoloration increased towards 100%. These relationships applied for all plots, regardless of their site productivity, development stage or regeneration method
Sammendrag
This study describes how crown density changes were distributed within monitoring plots, in order to determine whether the reduced crown density observed could be explained as a worsening of a limited number of unhealthy or small and slightly suppressed trees.Crown density, yellowing, coning and stem diameter data were available from 447 selected plots comprising 22560 single trees all having a complete 1990-97 series of crown condition data.The eight years series of crown density for each tree were recalculated to two median values, for 1990-93 and 1994-97, in order to reduce the influence from short time variations including random errors. The scores for yellowing and amounts of cones were averaged over the years 1990-93. These variables, and diameter, were recalculated to rank indices within each plot.Relationships between variables were described by graphs and examined by correlation analyses of the indices. The trees tended to retain their internal ranking. Generally, when crown density for a plot has changed, most of the trees were affected. The most defoliated trees in each plots had the least negative changes, but except from that the trees were equally affected regardless of their yellowing, amount of cones, and their size.The results demonstrates that any effects from competition between the trees were sufficiently removed in the assessments, even in densely stocked stands.