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.
2002
Forfattere
Hans Haavardsholm Blom Kristian Hassel Tommy PrestøSammendrag
Det er ikke registrert sammendrag
Forfattere
O. SkaugeSammendrag
Det er ikke registrert sammendrag
Forfattere
Geir-Harald StrandSammendrag
Det overordnede målet med denne studien har vært å gi et grovt anslag på hvilke arealmessige konsekvenser en temperaturheving vil ha for skogbruket i Norge. Den operative målsettingen har vært å beregne hvilke endringer som kan forventes i det tresatte arealet ved ulike grader av temperaturheving.
Forfattere
Jan-Ole SkageSammendrag
Hondogran, blågran fra Arizona, koreaedelgran og fjelledelgran har gitt best overlevelse og høydevekst i indre Nordfjord. Dette viser resultater fra et lite radforsøk som Norsk institutt for skogforskning (Skogforsk) gjennomfører med treslag og provenienser på Langvin jordbruksskole i Stryn. Koreaedelgran og fjelledelgran hadde overraskende få toppskader, mens hondogran og blågran hadde flest tørre og doble topper. Juletreutbyttet er imidlertid ikke vurdert da trærne fortsatt er for små. Det frarådes allerede nå å plante treslagene hondogran, ajangran, blågran fra Colorado, tyrkeredelgran, trojaneredelgran og ormehamfuru i indre Nordfjord før proveniensene i disse treslagene er bedre undersøkt. Dette fordi disse treslagene har for dårlig overlevelse og vekst, bortsett fra hondogran hvor opplysningene om proveniens er for usikre
Forfattere
Harald Kvaalen Ola Gram DæhlenSammendrag
Det er ikke registrert sammendrag
Forfattere
Inger Sundheim Fløistad G.G. PatilSammendrag
The root collar diameter and the height:diameter ratio are of particular importance in container-grown seedlings where a high density in the containers may produce spindly seedlings. Temperature regimes and light quality are known to affect plant growth.The aim of this study was to identify responses in Picea abies (L.) Karst. seedlings grown with light providing different red:far-red ratios and under temperature regimes with alternating day (DT) and night temperature (NT) from negative (DT NT) difference (DIF) between DT and NT. Experiments were conducted in controlled environment chambers and in a daylight phytotron.Only limited thermoperiodic responses appeared in P . abies seedlings with respect to seedling height and dry weight accumulation. The formation of terminal buds, however, was clearly delayed in seedlings grown at negative DIF.The results indicate a requirement for day extension light that is high in far-red, to prevent terminal bud formation under natural short-day conditions. An extended study should be conducted to clarify the minimum level of light intensity and the optimal light quality needed to prevent terminal bud formation under natural short-day conditions.
Forfattere
O. Janne Kjønaas Isabella Børja Nicholas Clarke Heleen A. de Wit Lars Strand Hooshang MajdiSammendrag
Det er ikke registrert sammendrag
Forfattere
Erlend Ystrøm Haartveit Per Otto FlæteSammendrag
Modulus of Elasticity (MOE) and Modulus of Rupture (MOR) were measured on lumber from trees originating from four stands in each of the countries Norway and Sweden. Half of the stands were monocultures of Norway spruce while the remainder were mixed stands of Norway spruce and birch species.No significant differences in MOE and MOR were found between Norway spruce lumber grown in monocultures and lumber originating from mixed stands. Furthermore, there were no significant differences between the two groups concerning wood density, mean annual ring width and diameter of the largest knot in each log.These three variables also yielded similar models for lumber originating from monocultures and mixed stands, respectively, when used as independent variables in simple regression models for MOE and MOR.PLS1 regression models, with a X-matrix of variables measurable with simple equipment on trees and logs, were used to sort logs according to predicted values of MOE and MOR. The models show promising results with respect to pre-sorting of logs in order to create a better fit between the quality of logs and the expected properties of the final products.When sorting logs, a high percentage is correctly classified, and the cumulative distributions of the two groups resulting from sorting are clearly different. Hence, PLS1 regression models using simple measurements on trees and logs seems potentially useful for predictions of MOE and MOR without the use of advanced technical equipment.
Sammendrag
A quantitative multiplex real-time PCR procedure was developed to monitor the dynamics in Norway spruce (Heterobasidion annosum) pathosystem. The assay reliably detected down to 1 pg of H. annosum DNA and 1 ng of host DNA in multiplex conditions. As a comparative method for quantifying fungal colonization,we applied the ergosterol assay. There was a very high correlation between the results obtained with the two methods, this strengthening the credibility of both assays. The advantages and disadvantages of these assays are discussed.
Forfattere
Petter NilsenSammendrag
En gjennomgang av viktige faktorer som vind, temp., frost osv. i relasjon til skogens stabilitet. Betydningen for skogbehandlingen ved forandringer av disse i framtiden diskuteres.