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.
2010
Forfattere
Kristian HaugSammendrag
Det er ikke registrert sammendrag
Forfattere
Anne Kari BergjordSammendrag
Foredraget omhandlet prinsipper for balansert næringsforsyning og viktigheten av god gjødselplanlegging. De nye fosfornormene for korn, engvekster og potet ble gjennomgått. Foredraget tok også opp enkelte moment i forhold til bruk av mineralgjødsel som supplement til husdyrgjødsel.
Forfattere
Bernt Olav Hoel Hans Jostein TandsætherSammendrag
Strukturendringer i kornproduksjonen har medført stadig større enheter. Mange dyrkere skal hver vår så betydelige arealer, ofte fordelt på et stort antall skifter. I en 3-årig forsøksserie ble tradisjonelle gjødslingsstrategier sammenlignet med alternative, mer tidseffektive metoder.
Forfattere
Bernt Hoel Hans TandsætherSammendrag
Det er ikke registrert sammendrag
Forfattere
Anette SundbyeSammendrag
Det finnes mange nytteorganismer som kan være effektive mot skadedyr i hagen. Rovmidd, marihøner, rovteger, gulløyer og blomsterfluelarver er effektive rovdyr, mens snylteveps og nematoder er effektive parasitter. Noen nytteorganismer er bladlusspesialister, mens andre er spesialister mot spinnmidd. Enkelte nytteorganismer spiser også flere byttedyrarter. Det er derfor en fordel å ha kunnskap og omtanke for hvilke nytteorganismer som finnes, og for hvordan forholdene kan tilrettelegges for at de skal gjøre en innsats mot skadedyr i hagen.
Sammendrag
Under pynten på grantreet ligger dype hemmeligheter om betydningen av arv, miljø og vår evne til å tilpasse oss våre omgivelser. Et nypyntet juletre er et av høytidens mange vakre symboler. Nyere forskning knytter grantrærnes overlevelsesevne til det som kalles epigenetikk – selve møteplassen mellom arv og miljø. Epigenetiske effekter gir grantrær, mennesker og andre levende vesener fleksibilitet til å tilpasse seg forandringer i omgivelsene raskere enn hva klassisk genetikk tilsier.
Forfattere
Miguel D. Mahecha Markus Reichstein Nuno Carvalhais Gitta Lasslop Holger Lange Sonia I. Seneviratne Rodrigo Vargas Christof Ammann M.Altaf Arain Alessandro Cescatti Ivan A. Janssens Mirco Migliavacca Leonardo Montagnani Andrew D. RichardsonSammendrag
The respiratory release of carbon dioxide (CO2) from the land surface is a major flux in the global carbon cycle, antipodal to photosynthetic CO2 uptake. Understanding the sensitivity of respiratory processes to temperature is central for quantifying the climate–carbon cycle feedback. We approximated the sensitivity of terrestrial ecosystem respiration to air temperature (Q10) across 60 FLUXNET sites with the use of a methodology that circumvents confounding effects. Contrary to previous findings, our results suggest that Q10 is independent of mean annual temperature, does not differ among biomes, and is confined to values around 1.4 ± 0.1. The strong relation between photosynthesis and respiration, by contrast, is highly variable among sites. The results may partly explain a less pronounced climate–carbon cycle feedback than suggested by current carbon cycle climate models.
Sammendrag
Understanding the feedback between terrestrial biosphere processes and meteorological drivers is crucial to ecosystem research as well as management. For example, remote sensing of the activity of vegetation in relation to environmental conditions provides an invaluable basis for investigating the spatiotemporal dynamics and patterns of variability. We investigate the Fraction of Absorbed Photosynthetically Active Radiation (fAPAR) using SeaWiFS satellite observations from 1998 to 2005 and ancillary meteorological variables from the CRU-PIK dataset. To what extent do precipitation and temperature dominate the terrestrial photosynthetic activity on monthly to interannual time scales? A spectral decomposition using Singular System Analysis leads to a global ‘classification’ of the terrestrial biosphere according to prevalent time-scale dependent dynamics of fAPAR and its relation to the meteorology. A complexity analysis and a combined subsignal extraction and dimensionality reduction reveals a series of dominant geographical gradients, separately for different time scales. Here, we differentiate between three time scales: on short time scales (compared to the annual cycle), variations in fAPAR coincide with corresponding precipitation dynamics. At the annual scale, which explains around 50% of the fAPAR variability as a global average, patterns largely resemble the biomes of the world as mapped by biogeographic methods.At longer time scales, spatially coherent patterns emerge which are induced by precipitation and temperature fluctuations combined. However, we can also identify regions where the variability of fAPAR on specific time scales cannot be traced back to climate and is apparently shaped by other geoecological or anthropogenic drivers. http://uregina.ca/prairies/assets/Prairie_Summit_Final_Program.pdf
Sammendrag
Determining the feedbacks between terrestrial biosphere processes and the meteorological drivers (here precipitation and temperature) is crucial to ecosystem research. In this context, the continuous monitoring of the earth surface provides an invaluable basis for investigating the spatiotemporal dynamics in the activity of vegetation in relation to environmental conditions. Here, we seek to identify which patterns of variability in the meteorological drivers dominate the terrestrial photosynthetic activity from monthly to interannual time scales (resp. fluctuation frequencies). We investigate the Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) using SeaWiFS observations from 1998 to 2005 and ancillary meteorological variables. A spectralanalysis leads to a global `classification` of the terrestrial biosphere according to prevalent scale dependent dynamics of fAPAR and its relation to the meteorology. A combined subsignal extraction and dimensionality reduction reveals a series of dominant geographical gradients on specific time scales. E.g. we uncover spatially coherent patterns at low frequencies and show where these are induced by precipitation or temperature fluctuations. We also show where high frequency variations (relative to the annual cycle) in fAPAR coincide with corresponding precipitation dynamics. However, we can also identify regions where the variability of fAPAR on specific time scales cannot be traced back to climate and is apparently shaped by other geoecological or anthropogenic drivers. http://www.terrabites.net/fileadmin/user_upload/terrabites/PDFs/Programme_Book_TERRABITES.pdf
Sammendrag
Det er ikke registrert sammendrag