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
Forfattere
Frank Götmark Björn Nordén Niklas Franc Heidi Paltto Ted von Proschwitz Bjørn Økland Monrad JensenSammendrag
Det er ikke registrert sammendrag
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag
Forfattere
Hugh RileySammendrag
Innlegg under besøk fra FMLA Hedmark
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag
Forfattere
Mona RingnesSammendrag
Det er ikke registrert sammendrag
Forfattere
Åsmund AsdalSammendrag
Det er ikke registrert sammendrag
Forfattere
Mette Goul ThomsenSammendrag
Nettverk Rosenrot-møte 2009:Presentasjon av resultater og nytt fra firmaer ved Mette Goul Thomsen.- Preliminære resultater fra gjødslings forsøkene viste nå etter 2,5 år på felt ikke noe utslag for N-gjødsling på morenejord. Dette tilsvarer resultatene presentert av Kwesi i fjor. Konklusjonen hans var at N og P gjødsling ikke hadde noen effekt på Rhodiola som vokste på jord med lavt næringsinnhold. Studier fra Russland har dog konkludert annerledes (se rapporten fra Steinar Dragland 2004), derfor avventer vi endelige resultater etter høstingen i år. Formering ved stiklinger ble diskutert. Tilveksten ved denne formeringsmåte er naturlig nok raskere, men hvordan utvikling i innholdsstoffer er har vi ikke umiddelbart noe informasjon på. Dette skal vi se nærmere på etter hvert. Resultatene på tørketemperatur viste at temperatur under 50 ˚C gir høyest innhold av aktive stoffer. Dette tilsvarer resultater fra Canada, hvor temperatur under 55˚C for rhizomer var funnet optimale. Resultater fra Finland viser at oppbevaring av høstede røtter bør skje på kjøl ca. 5 ˚C og for vaskede og oppdelte røtter på frys. Videre så vi på russiske undersøkelser av morfologiske forskjeller i rosenrot. Variasjonen er meget stor og hvorvidt vi kan relaterer disse til mengde av innholdsstoffer gjenstår å se. I forbindelse med årets møte har vi kontaktet flere firmaer. Firmaene vi har vært i kontakt med er Faun Pharma i Drøbak; Swepharm; Örtmedisinske; Biokraft (alle tre i Sverige) og Pharmaplant i Tyskland. Et par av disse ville ta kontakt hvis det ble behov for å kjøpe inn rosenrot. Det er mulig at man burde lage en oversikt over hva man har å tilby av rosenrot i Norge og finne ut om man vil gå sammen for å tilby større mengder. Prisene er det vanskelig å få opplysninger om men et rask overslag fra Finland antydet en pris på 18 Euro/kg for importert vare og 33 Euro/kg for Finsk.Demonstrasjon av ugras regulering med seksjonsfres og opptak på flat jord med potetopptaker ble demonstrert og ser ut til å fungere bra.
Sammendrag
New results are presented on taxonomic position, pathogenicity and control of the needle cast fungus Kabatina abietis, a species causing economic losses in Christmas tree production in various European countries as well as in Northeast USA. Trials with copper fungicides conducted in 2008 in Denmark, Norway, Germany, Austria and USA against Kabatina abietis were unsuccessful. Though the identity of Kabatina abietis with Sydowia polyspora as well as its pathogenicity was confirmed by a thesis in Norway, it remains unclear, whether the characteristic needle symptoms could be the result of different damaging agents.
Sammendrag
Growth of Norway spruce (Picea abies) trees and nitrogen deposition were analysed at about 500 forest plots throughout Norway in six fiveyear periods from 1977 to 2006. Growth was calculated from five repeated calliper measurements of all trees during this period and using treering series from increment cores of a subsample of trees. From the growth data a `relative growth` variable was extracted, being the deviation in % between observed and expected growth rates. The expected growth was estimated from growth models based on site productivity, age and stand density at each plot. The plots were categorized into four age classes. The nitrogen deposition was estimated for each plot for the same five year periods by geographical interpolation of deposition observations at monitoring stations made by the Norwegian Institute for Air Research. Nitrogen deposition from 1977 to 2006 ranged from 1 to 24 kg/ha/yr at the study plots, with about 15 kg/ha/yr in the southernmost region and 3 kg/ha/yr in the northern region of Norway. For the entire 30year period we found a long term relationship between growth and nitrogen deposition, corresponding to a forest growth increase of 0.7% per kg total nitrogen deposition per hectare and year (r2 = 0.13). This is in line with studies carried out on other data sets and for shorter time periods. This apparent fertilizing effect was most pronounced for the youngest forest, while the effect was weak for the oldest forest. The growth increase was observed in the southernmost part of Norway, the region with the highest nitrogen deposition. However, the relationship between nitrogen deposition and growth varied considerably between the time periods. In two of the periods the relationship was slightly negative: these periods corresponded well with summer droughts occurring in the southernmost part of Norway. Drought, as well as other climatic factors, will influence the shortterm variations in forest growth and may obscure the fertilizing effect of nitrogen deposition in some periods. In conclusion, nitrogen deposition has most likely increased growth in Norway spruce in southern Norway. However, our study also shows that inferences from such correlative studies should be drawn with care if the growth period is shorter than 10–15 years because climatic factors produce temporal variations in the relationship between nitrogen deposition and forest growth.
Forfattere
Per Stålnacke Annelene Pengerud Marianne Bechmann Josette Garnier Christoph Humborg Vladimir NovotnySammendrag
The major objective of this study was to compile and examine empirical relationships between the driving forces and pressures that affect nitrogen cycling. Special attention was paid to riverine loads, fluxes, and concentrations of nitrogen in relation to agricultural factors (e.g., land use and fertilisers) at various spatial scales (plot, field, catchment, river basin, nation, region, continent, and world). Results of the present analyses and assessments reported in the literature indicate that at global, continental and inter-river basin scales, the level of riverine nitrogen loads (pressures) can be readily derived from simple empirical relationships with driving forces like population density and agricultural factors (e.g., proportion of arable land and fertiliser use). It seems that statistically derived relationships do not hold or are much weaker at the scales of single river basins and smaller catchments, whereas nitrogen losses appear to be correlated with fertiliser use at the smallest scales (plot and field). It is important to recognize this spatial nutrient paradox, particularly when such functional relationships are applied in the contexts of management and decision making. The implications for management are given further consideration in this paper.