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.
2008
Forfattere
Eva SkarbøvikSammendrag
Det er ikke registrert sammendrag
Sammendrag
Rapporten inneholder rammeplaner for aktuelle kurstema innen restaurering og skjøtsel av kulturlandskap, basert på spørreundesøkelser til de ulike fylkesbondelagene.
Forfattere
Carl Jonas Jorge SpetzSammendrag
Det er ikke registrert sammendrag
Forfattere
Dag-Ragnar BlystadSammendrag
Det er ikke registrert sammendrag
Forfattere
Carl Jonas Jorge SpetzSammendrag
Det er ikke registrert sammendrag
Forfattere
Helge SjursenSammendrag
Raudtvitann hører til den biologiske gruppen vinterettårige ugras. Den voksne planten er 15-30 cm, med tynn, greinet pålerot. Stengelen er opprett, greinet fra grunnen, firkantet og glatt, av og til svakt håret øverst. Bladene har greinete bladnerver, er motsatte, håret og rundtannet. Bladene nederst på stengelen er langstilket og breit hjerteformet, bladene øverst er kortstilket, breit egg-hjerteformet, ofte noe purpurfarget. De purpurrøde blomstene, med tydelig hårkrans innvendig, sitter i kranser i bladhjørnene, de øvre tett sammen. Planten har ubehagelig lukt. Forekommer i dyrket mark, langs hekker og gjerder, i tangvoller og sanddyner, på veikanter og avfallsplasser. Liker løs, næringsrik moldjord og lettere leirjord, gjerne sterkt gjødslet. Opptrer som ugras i hager og i alle slags åkerkulturer. Raudtvitann har enda lettere for å så seg selv enn då-artene. Å hindre frøkasting ved godt reinhold i åkeren er et viktig forebyggende tiltak. Planten er relativt lett å bekjempe ved ugrasharving og radrensing. Mot raudtvitann finnes det flere brukbare kjemiske ugrasmidler.
Sammendrag
The difficulty in subculturing biotrophic fungi complicates etiological studies related to the associated plant diseases. By employing internal transcribed spacer rDNA-targeted quantitative real-time polymerase chain reaction, we now show that the heteroecious rust Thekopsora areolata, commonly associated in natural conditions to sapling shoots and cones of Norway spruce and leaves of wild bird cherry, frequently infects nurserygrown seedlings of the conifer. A spatial sampling scheme was used to investigate seedlings and saplings of Norway spruce showing phloem necrosis: the highest concentration of DNA of T. areolata was recorded in the area with necrotic phloem. The separate analysis of bark and wood tissues suggested that the initial spread of the rust to healthy tissues neighboring the infection site takes place in the bark. A Phomopsis species found to coexist with T. areolata in several seedlings showed very high DNA levels in the upper part of the lesion, and even in the visually healthy proximal tissues above the lesions, which indicates that the ascomycete, most probably a secondary invader following primary infection by T. areolata, has a latent stage during early host colonization. We hypothesize that this hemibiotrophic mode of infection contributes to the successful coexistence of Phomopsis with a biotrophic rust.
Forfattere
Christian UhligSammendrag
This study reassessed the long-term effects (10 years) of different revegetation methods for the reclamation of a steep sandy slope under sub-arctic conditions. Four different organic based erosion control mats a) coconut, b) straw, c) coconut/ straw and d) wool in combination with the three propagated native plant species i) Poa pratensis (seeds), ii) Festuca rubra (seeds) and iii) Betula nana (transplants) and fertilizer treatments were studied. An assessment three years after establishment of the experiment indicated that the majority of the selected materials and methods gave satisfying results. However, reassessment after 10 years gave a rather opposite result. With exception of the wool mat none of the erosion control mats gave any long-term advantages. The coconut mat had not changed in physical appearance and represented a hinder rather than an advantage for plant establishment and soil development. In contrary few remains of the straw and straw/ coconut mats could be found and there were no obvious signs of any beneficial effect of these materials. None of the seeded native grass species were alive after ten years, but the majority of the Betula nana transplants had survived. Apart from increased survival and growth rates of B. nana, the most obvious effect of mineral fertilization was a higher appearance of Polytrichum sp. Consequently, results from this study clearly emphasizes the importance of repeatedly reassessment of revegetation efforts to avoid recommendations of short-time operational but long-time inappropriate revegetation materials ands methods.
Forfattere
Anders BrynSammendrag
The forest limits of south-east Norway have expanded to higher altitudes. Two main processes are believed to cause these changes; re-growth after abandonment of human utilisation and recent climate changes. This article aim at separating the effects of these two processes on the upper forest limits and recent forest expansion. The results show that raised forest limits and forest range expansion often attributed to recent climate change is rather the product of re-growth, a process that was climatically retarded from 1959 to 1995. From 1995 to 2006, the data indicate a preliminary effect of climate change escalating the re-growth and probably pushing the future forest limits to higher altitudes.
Forfattere
Anne Falk ØgaardSammendrag
Det er ikke registrert sammendrag