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.
2012
Forfattere
Erik J. JonerSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Signe Kynding Borgen Hanne Lunde Weichel Lars Bakken Marina Azzaroli Bleken Tor Arvid BrelandSammendrag
Det er ikke registrert sammendrag
Sammendrag
The current IPCC guidelines define an estimate for the fraction of mineral fertilizer and animal waste (manure) lost to leaching and runoff (FracLEACH). The FracLEACH default is 30 %. In Norway, 18 % has been used based on calculations made in 1998 (Vagstad et al., 1998). The main purpose of this study was to give an updated estimate of nitrogen (N) leaching in relation to the amounts of N applied in agriculture (FracLEACH). The term losses in this report include both surface and subsurface runoff. The estimates of FracLEACH presented in this report were based on data from the Agricultural Environmental monitoring program (JOVA). The JOVA-program includes catchment and field study sites representing typical situations in Norwegian agriculture with regard to production system, management, intensity, soil, landscape, region and climate. Data from plot- scale study sites confirmed the level of N leaching from the agricultural areas within the JOVA catchments. The overall FracLEACH estimated in this study was 22 % of the N applied. This average covers a variation between sites from 16 % on grassland in Valdres to 44 % in intensive vegetable, potato and cereal production areas in the southernmost part of Norway. Runoff is the most significant parameter for the difference in FracLEACH between catchments. In addition, production system and to some degree soil type are important for FracLEACH. It is thus suggested to use different FracLEACH-values for the different production systems and adjust FracLEACH according to average runoff for the region.
Sammendrag
Nitrogen er et viktig næringsstoff for plantevekst og dessuten en viktig komponent i avrenning og klimagasstap. Derfor er det viktig med en mest mulig effektiv utnyttelse av nitrogen i jordbruket. Resultater fra JOVA-programmet viser at nitrogenbalansen i kornproduksjon i gjennomsnitt for de siste 20 årene har vært på om lag 5 kg N/daa. Det er ikke registrert endringer i denne tidsperioden.
Forfattere
Marianne BechmannSammendrag
Det er ikke registrert sammendrag
Forfattere
Randi Berland Frøseth Anne Kjersti Bakken Marina Azzaroli Bleken Hugh Riley Kristian Thorup-Kristensen Sissel HansenSammendrag
Det er ikke registrert sammendrag
Forfattere
Randi Berland Frøseth Anne Kjersti Bakken Marina Azzaroli Bleken Hugh Riley Kristian Thorup-Kristensen Sissel HansenSammendrag
I forsøk med ulik grønngjødselhåndtering fant vi en betydelig positiv avlingseffekt på påfølgende byggavling av å la grønnmassen bli liggende etter hver slått sammenlignet med å fjerne den. Biorest fra anaerobt fermentert grønnmasse ga samme avlingsnivå og bedre nitrogenutnytting enn å la grønnmassen bli liggende på stubben for å råtne etter hver slått.
Forfattere
Bernt-Håvard ØyenSammendrag
Det er ikke registrert sammendrag
Forfattere
Kjell Andreassen Bernt-Håvard ØyenSammendrag
Growth conditions in Fennoscandia are characterized by relatively short growth seasons and cold winters, from 130 growth days (T 5C) in the far north high mountains to more than 200 in south Sweden and Norway. Growth models from different regions predict different forest growth.In this study, we compare some models commonly applied in forest growth prognosis in pure even aged stands of Norway spruce, Scots pine and birch in Finland, Sweden and Norway. The objectives is to identify behavioural properties, accuracy and bias in selected Nordic growth models using a wide-ranging test data set from permanent research plots in Norway.Present tentative conclusions about the accuracy of growth outside the geographical range of the original base materials. With four different response variables in the tested models we emphasized relative deviations rather than absolute values as most suitable for comparisons. The models were compared by statistical tests, a visual inspection of the smoothed curve of the relative deviations in different stand properties and ranked due to their performance.We observed site index, stand density and mean tree size as the three main components in the models. For Norway spruce a basal area increment model from Sweden had the lowest standard deviation with 23 %. The mean R2 between residuals and stand characteristics from this model was also low (1.3 %), which indicates that variables are well included in the model. For Scots pine and birch, Finnish percent volume growth models showed the best fit to the Norwegian test data, with a R2 between residuals and stand characteristics of 2.8 and 6.7 %, respectively. Several of the models from Sweden and Finland predict the growth as well as stand models frequently in use in Norway.