Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2013
Abstract
Use of harvest residues for bioenergy is minimal in Norway, and the proposed increase of 14 TWh in annual bioenergy use by year 2020 may thus to a large part be based on residues from conventional timber harvesting. To judge the potential of harvest residues for bioenergy both in the short and long run, we present cost-supply curves for residue harvesting at national and regional levels. We produce different harvesting scenarios using the detailed forest model Gaya/J and a representative description of the Norwegian forest area from Norwegian national forest inventory (NFI) sample plots including environmental restrictions. Forest information is sufficiently detailed to estimate necessary biomass fractions and calculate costs of harvest residue extraction at plot level. We estimate a maximum annual energy production of 5.3 TWh from harvest residues with the present harvest level, which is far from the official target. In principle, there are two solutions for achieving this target; increase harvests and thus the corresponding residue supply, or increase the use of roundwood for energy purposes on the expense of pulpwood. Scenarios with long-run increase in timber production shows an annual energy potential from harvest residues in the range 6–9 TWh. Thus, to reach the political target roundwood must be used for energy production.
Abstract
Acetylation appears suited to provide adequate protection against biological attack for materials derived from non-durable wood species. But still there are unanswered questions related to resistance against fungal decay. The paper summarises existing knowledge related to fungal deterioration of acetic anhydride modified wood and also highlights future research opportunities. In addition, statistical analyses based on previously published decay fungi studies were performed to quantify what factors contribute most to the performance (calculated as test sample/control). The results showed that weight per cent gain can explain approximately 50% of the performance for acetic anhydride treated wood. Others of the applied variables, like wood species or type of fungus, can reduce the variance in performance by additional 15%. Based on the surveyed literature the degree of cell wall bulking in combination with lowering of the equilibrium moisture content seems to be the primary mode of action.
Authors
Belachew Asalf Tadesse David M. Gadoury Anne Marte Tronsmo Robert C Seem Lance Cadle-Davidson Marin T. Brewer Arne StensvandAbstract
No abstract has been registered
Authors
Ingrid Holtsmark Sungsu Lee Kristin Aaser Lunde Kathrine Auestad Jodi Grødem Simon Geir MøllerAbstract
No abstract has been registered
Authors
Rajat Panwar Karen Paul Erlend Nybakk Eric N. Hansen Derek ThompsonAbstract
Corporate social responsibility (CSR) is one of the ways through which companies gain legitimacy. However, CSR actions themselves are subject to public skepticism because of increased public awareness of greenwashing and scandalous corporate behavior. Legitimacy of CSR actions is indeed influenced by the actions of the company but also is rooted in the basic cultural values of a society and in the ideologies of evaluators. This study examines the legitimacy of CSR actions of publicly traded forest products companies as compared to family-owned forest products companies. Results indicate a lower legitimacy for CSR actions of publicly traded companies than for family-owned companies. The study also examines the effect of social responsibility orientation (SRO) of evaluators on the legitimacy accorded to companies’ CSR actions. We found that SRO was negatively associated with legitimacy, especially for women. Perceived profitability of companies was negatively associated with legitimacy of CSR actions for publicly traded but not for family-owned companies.
Abstract
Solberg, Svein; Astrup, Rasmus Andreas; Weydahl, Dan Johan. Detection of forest clear-cuts with shuttle radar topography mission (SRTM) and tandem-X InSAR data. Remote Sensing 2013 ;Volum 5.(11) s. 5449-5462
Abstract
There is a need for monitoring methods for forest volume, biomass and carbon based on satellite remote sensing. In the present study we tested interferometric X-band SAR (InSAR) from the Tandem-X mission. The aim of the study was to describe how accurate volume and biomass could be estimated from InSAR height and test whether the relationships were curvilinear or not. The study area was a spruce dominated forest in southeast Norway. We selected 28 stands in which we established 192 circular sample plots of 250 m2, accurately positioned by a Differential Global Positioning System (dGPS). Plot level data on stem volume and aboveground biomass were derived from field inventory. Stem volume ranged fromzero to 596 m3/ha, and aboveground biomass up to 338 t/ha.We generated 2 Digital Surface Models (DSMs) fromInSAR processing of two co-registered, HH-polarized TanDEM-X image pairs – one ascending and one descending pair.We used a Digital TerrainModel (DTM) from airborne laser scanning (ALS) as a reference and derived a 10 m × 10 m Canopy Height Model (CHM), or InSAR height model. We assigned each plot to the nearest 10 m × 10 m InSAR height pixel. We applied a nonlinear, mixed model for the volume and biomass modeling, and from a full model we removed effects with a backward stepwise approach. InSAR heightwas proportional to volume and aboveground biomass, where a 1 m increase in InSAR height corresponded to a volume increase of 23 m3/ha and a biomass increase of 14 t/ha. Root Mean Square Error (RMSE) values were 43–44% at the plot level and 19–20% at the stand level.
Authors
Trond Rafoss Jarle Skahjem John Atle Johansen Ståle Johannessen Sekhar Udaya Nagothu Inger Sundheim Fløistad Arild SlettenAbstract
No abstract has been registered
Authors
Darren J. Kriticos Robert C. Venette Richard H.A. Baker Sarah Brunel Frank H. Koch Trond Rafoss Wopke van der Werf Worner Susan P.Abstract
No abstract has been registered
Abstract
No abstract has been registered