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.
2006
Forfattere
Michael M. Müller Kari KorhonenSammendrag
Det er ikke registrert sammendrag
Forfattere
Rune Halvorsen Økland Harald Bratli Wenche E. Dramstad A. Edvardsen Gunnar Engan Wendy Fjellstad Einar Heegaard Oddvar Pedersen Heidi SolstadSammendrag
Knowledge of variation in vascular plant species richness and species composition in modern agricultural landscapes is important for appropriate biodiversity management. From species lists for 2201 land-type patches in 16 1-km2 plots five data sets differing in sampling-unit size from patch to plot were prepared.Variation in each data set was partitioned into seven sources: patch geometry, patch type, geographic location, plot affiliation, habitat diversity, ecological factors, and land-use intensity.Patch species richness was highly predictable (75% of variance explained) by patch area, within-patch heterogeneity and patch type. Plot species richness was, however, not predictable by any explanatory variable, most likely because all studied landscapes contained all main patch types ploughed land, woodland, grassland and other open land and hence had a large core of common species.Patch species composition was explained by variation along major environmental complex gradients but appeared nested to lower degrees in modern than in traditional agricultural landscapes because species-poor parts of the landscape do not contain well-defined subsets of the species pool of species-rich parts.Variation in species composition was scale dependent because the relative importance of specific complex gradients changed with increasing sampling-unit size, and because the amount of randomness in data sets decreased with increasing sampling-unit size. Our results indicate that broad landscape structural changes will have consequences for landscape-scale species richness that are hard or impossible to predict by simple surrogate variables.
Forfattere
Jolanda Roux Halvor Solheim Gilbert Kamgan Nkuekam Michael J. WingfieldSammendrag
Det er ikke registrert sammendrag
Sammendrag
We examined growth responses of Norway spruce using tree-ring series from increment cores and monthly climate variables over the period 19001998. The 1398 cores were selected from 588 plots scattered all over Norway. We correlated tree-ring indices with temperature, precipitation, Palmer drought severity index and length of the growing season.The weather in June had the largest influence on ring widths. However, two different, and almost opposite, response types were found: Tree growth was restricted by June precipitation in the lowlands in southeastern Norway, but by the June temperature in other regions and at high altitudes.In order to define the shift between these two main response types, we correlated response functions with various 30-year mean climatic variables, including humidity and aridity indices. The 30-year mean June temperature was the variable most clearly showing this shift in response, with a threshold at 1213C. At sites with normal temperature below this threshold, spruce responded positively to unusually warm and dry June months, and vice versa.
Forfattere
Bernt-Håvard ØyenSammendrag
Skogressurser og økonomiske effekter av skogreisingen i Nord-Norge er belyst.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Peder GjerdrumSammendrag
Most (all?) equipment waste timber by turning 10% of valuable solid wood into sawdust and allowance. The presentation discusses the problem and suggests a technology project to splitting blocks of modest size with new, strong materials for thin kerfs and optimised in yield and product quality rather than in speed.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Ken Olaf StoraunetSammendrag
In recent years attention has focused on the consequences of modern forestry on biological diversity. Additionally, past forest management has reduced the structural heterogeneity of forest landscapes, increasing the interest in assessing forest naturalness. General forest history of Norway shows that single-tree and selective logging was the main silvicultural method up to the mid-twentieth century when clearcutting practice took over as the dominating logging regime. Thus, regenerating forests on former clearcut areas have barely reached the stages of maturity, implying that mature forests of today for the most part are remnants from the period of selective logging. This thesis has been part of a comprehensive research project where one of the general objectives was to gain knowledge on the distribution and abundance of rare and threatened species in Norwegian forests....
Forfattere
Lone Ross GobakkenSammendrag
Det er ikke registrert sammendrag