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.
2009
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Ari Hietala Nina Elisabeth Nagy Arne Steffenrem Harald Kvaalen Carl Gunnar Fossdal Halvor SolheimSammendrag
Det er ikke registrert sammendrag
Sammendrag
In trees adapted to cold climates, conditions during autumn and winter may influence the subsequent timing of bud burst and hence tree survival during early spring frosts. We tested the effects of two temperatures during, dormancy induction Mid mild spells (MS) during chilling, on the timing of bud burst in three Picea abies (L.) Karst. provenances (58-66 degrees N). One-year-old seedlings were induced to become dormant at temperatures of 12 or 21 degrees C applied during 9 weeks of short days (12-h photoperiod). The seedlings were then moved to cold storage and given either continuous chilling at 0.7 degrees C (control), or chilling interrupted by one 14-day MS it either 8 or 12 degrees C. Interruptions with MS were staggered throughout the 175-day chilling period, resulting in 10 MS differing in date of onset. Subsets of seedlings were moved to forcing conditions (12-h photoperiod, 12 degrees C) throughout the chilling period, to assess dormancy status different timings of the MS treatment. Finally, after 175 days of chilling, timing of bud burst was assessed in a 24-h photoperiod at 12 degrees C (control and MS-treated seedlings). The MS treatment did not significantly affect days to bud burst when given early (after 7-35 chilling days). When MS was given after 49 chilling days or later, the seedlings burst bud earlier than the controls, and the difference increased with increasing length of the chilling period given before the MS. The 12 degrees C MS treatment was more effective than the 8 degrees C MS treatment, and the difference remained constant after the seedlings had received 66 or more chilling days before the MS treatment was applied. In all provenances, a constant temperature of 21 degrees C during dormancy induction resulted in more dormant seedlings (delayed bud burst) than a constant temperature of 12 degrees C, but this did not delay the response to the MS treatment.
Forfattere
Øystein Johnsen Harald Kvaalen Igor A. Yakovlev O.G. Dæhlen Carl Gunnar Fossdal Tore SkrøppaSammendrag
Det er ikke registrert sammendrag
2008
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Progenies from a natural stand of Picea abies planted on a forest site with heterogeneous growth conditions were characterized for genetic and environmental control of internodal and whorl branch formation and lammas growth. The progenies studied were 27 years old from seed and planted in a randomized complete block experiment. Internodes and whorls studied were located in the top section of the trees. Significant genetic variation (p<0.01) was found for a number of internodal and whorl branches. Block means for the length of internodes, a strong indicator for the site index in respective blocks, were correlated strongly with branch dimensions (r >= 0.90), intermediately with the frequency of lammas growth (r = 0.81) and number of branches in whorls (r = 0.68), and only weakly with the number of internodal branches per length unit of internode (r = 0.25). A strong environmental effect on branch dimensions was supported by the relative size of variance components. The results show that the environmental effect expressed by site index dominates the control of branch dimensions, while the number of branches is under stronger genetic control in P. abies.
Sammendrag
This paper reports the results from a study of modulus of elasticity (MOE) and modulus of rupture (MOR) of 42 small clear specimens prepared from 300 year old roundwood floor girders containing high levels of NaCl at Bryggen in Bergen, Norway. NaCl concentration was 6.5 % of the dry matter of the wood. MOE and MOR were 25 % lower than the values obtained from a reference material with equivalent annual ring width and density. The considerable reduction of MOE and MOR should be taken into consideration in conservation of load-bearing wooden structures that have been exposed to NaCl.
Sammendrag
Denne rapporten omtalar ein forsøksserie med dei nordamerikanske treslaga blågran (Picea pungens Engelm.), engelmannsgran (Picea engelmannii Parry), fjelledelgran (Abies lasiocarpa (Hook.) Nutt.) og korkedelgran (Abies lasiocarpa var. arizonica (Merriam) Lemmon), og dei austasiatiske treslaga ajangran (Picea jezoensis (Sieb. et. Zucc.) Carr.) og hondogran (Picea jezoensis var. hondoensis (Mayr) Rehd.). Formålet med forsøket har vore å finne ut om proveniensar av desse treslaga, dei fleste henta frå høgt over havet i dei naturlege utbreiingsområda, kan vera eigna til juletredyrking i låglandet og dalstrok i Sør-Noreg. Forsøksmaterialet omfattar ein proveniens av kvar av ajan- og hondogran, og frå to til seks proveniensar av kvart av dei andre treslaga. Eitt forsøksfelt vart lagt ut i kvar av kommunane Bergen, Hjartdal, Modum, Rennebu, Ringebu og Trysil .....
Forfattere
Tor MykingSammendrag
Edellauvtreet alm (Ulmus glabra) har en vid utbredelse i Norge, men i et begrenset område er alm rammet av en alvorlig sykdom, den såkalte almesjuken. Dette er en viktig årsak til at alm ble rødlistet i 2006. Gjennom årene har mye blitt gjort for å kartlegge og begrense utbredelsen av sykdommen. Nylig har også viktige sider ved almens genetikk blitt studert. Denne folderen oppsummerer resultatene fra disse undersøkelsene. Brosjyre fra Skog og landskap, 3/2008 Norsk Genressurssenter
Forfattere
Tor MykingSammendrag
An international EU/Interreg III Kolarctic project `Development and implementation of an environmental monitoring and assessment program in the joint Finnish, Norwegian and Russian border area`, was carried out during 2003–2006 as a joint undertaking between Norwegian, Finnish and Russian research institutes and environmental authorities. The aim of the terrestrial ecosystem sub-project of the Pasvik project was to develop and implement a monitoring and assessment programme for terrestrial ecosystems in the joint Finnish, Norwegian and Russian border area...