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.
2015
Forfattere
O. Janne Kjønaas Nicholas Clarke Toril Drabløs Eldhuset Ari Hietala Hugh Cross Kjersti Holt Hanssen Tonje Økland Holger Lange Jørn-Frode Nordbakken Ingvald RøsbergSammendrag
Tree harvest and different harvesting methods may affect the soil carbon (C) pool in forest ecosystems. In con- ventional stem-only timber harvesting (SOH), branches and tops that are left in the forests may contribute to the build-up of the soil carbon pool. In whole-tree harvesting (WTH), inputs of organic matter from branches and tops are strongly reduced. We established field experiments at Gaupen, SE and Vindberg, SW Norway, to study the short-term effects of SOH and WTH on processes affecting the accumulation and loss of soil C. Logging residues on the WTH plots were collected in piles that were removed after 6 months, rendering two sub treatments (WTH- pile and WTH-removal areas). We weighed selected trees and logging residues, surveyed understorey biomass production, quantified pre-harvest soil C and nutrient pools down to 30 cm. Soil respiration was measured and soil water sampled monthly during the growing season, while temperature and moisture were measured continuously. Organic and mineral horizons were incubated at different temperatures to estimate potential C and N mineraliza- tion, and deep sequencing of the ITS2 barcode region of fungal DNA was performed on the samples. Litterbags were deployed in the SOH plots. The logging residues amounted to 2.2-2.4 kg C m-2 At Gaupen, the mean in situ soil respiration rates increased following harvest with all treatments, but were significantly higher in WTH-pile and SOH relative to the WTH- removal areas in the first year as well as the fourth year of treatment. The former rates included aboveground decomposing needles and twigs but excluded coarser branches. The observed increase in the WTH-removal areas may be related to decomposing roots, as well as to increased C mineralization partly due to the higher soil tem- peratures following harvest. Soil temperature was the single most important factor explaining the variability in soil respiration rates over all treatments. At Vindberg, a decrease in soil respiration was observed with all treatments in the second and third years following harvest. At both sites, decomposition of logging residues from needles was more rapid relative to twigs and fine roots. The decomposing residues released a substantial amount of nitrogen which was gradually reflected in the soil water at 30 cm soil depth. A considerable increase in the NO3-N concen- tration also in the WTH-removal areas in the second year following harvest suggests an increase in N availability from decomposing fine roots and/or soil organic matter. The increased N availability in the WTH-removal areas was supported by results from short term lab incubations of undisturbed soil from the forest floor. The changes in the WTH-removal areas were also reflected in the soil fungal diversity: saprophytic ascomycetes on decaying plant material showed a striking increase in all treatments. For the WTH-removal areas, this may, again, be related to the increased input of root litter; however, the decrease in mycorrhizal basidiomycete species and the vigorous increase of ascomycetes following harvest may also affect the C mineralization of soil organic matter.
Foredrag – Monitoring for REDD+ with InSAR
Svein Solberg, Belachew Gizachew Zeleke, Erik Næsset, ...
Forfattere
Svein Solberg Belachew Gizachew Zeleke Erik Næsset Terje Gobakken Ole Martin Bollandsås Ernest William Mauya Håkan Olsson Rogers Ernerst Malimbwi Eliakimu ZahabuSammendrag
Det er ikke registrert sammendrag
Forfattere
Svein Solberg Belachew Gizachew Zeleke Erik Næsset Terje Gobakken Ole Martin Bollandsås Eliakimu Zahabu Rogers Ernerst Malimbwi Håkan OlssonSammendrag
Det er ikke registrert sammendrag
Forfattere
Svein Solberg Belachew Gizachew Zeleke Erik Næsset Terje Gobakken Ole Martin Bollandsås Ernest William Mauya Håkan Olsson Rogers Malimbwi Eliakimu ZahabuSammendrag
Det er ikke registrert sammendrag
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Forfattere
John Arvid Grytnes Vivian Astrup Felde Hanne Henriksen Jutta Kapfer Kari Klanderud Mikael Ohlson Fride Høistad Schei Richard James Telford Risto VirtanenSammendrag
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Sammendrag
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