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.
2011
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Eva Narten HøbergSammendrag
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Forfattere
Eva Narten HøbergSammendrag
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Rapport – Matopplevelser på Helgeland – Et himmelsk sidesprang
Elisabet Ljunggren, Eva Narten Høberg
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Jon Løyland Runhild GudemSammendrag
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Nils VagstadSammendrag
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Forfattere
Atle Hauge Bent Braskerud Anne-Grete Buseth BlankenbergSammendrag
Materiał glebowy oraz nawozy i pestycydy erodowane z terenów uprawnych stanowią istotne zagrożenie dla cieków wodnych i jezior. Na całym świecie wykorzystanie oczyszczalni hydrofitowych (constructed wetlands – CWs) uznawane jest za skuteczny, a często - jedyny możliwy do zastosowania środek ograniczenia ilości zanieczyszczeń wód ze źródeł obszarowych. Zazwyczaj, do osiągnięcia dobrych rezultatów potrzebne są CWs o znacznych powierzchniach, jednakże w warunkach norweskich przy małych gospodarstwach i górzystym charakterze terenów rolniczych, niemożliwe jest konstruowanie wielkopowierzchniowych oczyszczalni hydrofitowych. Dlatego też w Norwegii budowane są CWs o niewielkich powierzchniach, rzędu 0,1% obszaru zlewni, mimo iż według niektórych badaczy (Chen, 1975; Haan i in., 1994; Kadlec i Knight, 1996) tak małe rozmiary oczyszczalni hydrofitowych powinny skutkować niską efektywnością sedymentacji cząstek glebowych i fosforu.
Sammendrag
We used two datasets of 14C analyses of archived soil samples to study carbon turnover in O horizons from spruce dominated old-growth stands on well-drained podzols in Scandinavia. The main data set was obtained from archived samples from the National Forest Soil Inventory in Sweden and represents a climatic gradient in temperature. Composite samples from 1966, 1972, 1983 and 2000 from four different regions in a latitude gradient ranging from 57 to 67º N were analysed for 14C content. Along this gradient the C stock in the O horizon ranges from 2.1 kg m-2 in the north to 3.7 kg m-2 in the southwest. The other data set contains 14C analyses from 1986, 1987, 1991, 1996 and 2004 from the O horizons in Birkenes, Norway. Mean residence times (MRT) were calculated using a two compartment model, with a litter decomposition compartment using mass loss data from the literature for the threefirst years of decomposition and a humus decomposition compartment with a fitted constant turnover rate. We hypothesized that the climatic gradient would result in different C turnover in different parts of the country between northern and southern Sweden. The use of archived soil samples was very valuable for constraining the MRT calculations, which showed that there were differences between the regions. Longest MRT was found in the northernmost region (41 years), with decreasing residence times through the middle (36 years) and central Sweden (28 years), then again increasing in the southwestern region (40 years). The size of the soil organic carbon (SOC) pool in the O horizon was mainly related to differences in litter input and to a lesser degree to MRT. Because N deposition leads both to larger litter input and to longer MRT, we suggest that N deposition contributes significantly to the latitudinal SOC gradient in Scandinavia, with approximately twice as much SOC in the O horizon in the south compared to the north. The data from Birkenes was in good agreement with the Swedish dataset with MRT estimated to 34 years.