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.
2000
Sammendrag
The present investigation deals with the properties of resonance wood destined for the production of musical instruments and with the methods for the determination of resonance wood quality. At the same time there are stated the range of values for the dynamic modulus of elasticity, for the speed of sound transmission and for the density of wood. The demands regarding dimension and growth characteristics of resonance wood are explained insisting first of all on pure subjective and visual criteria. The grading rules, existing only in a few regions in Germany, show that forestry is sensitized to this high value timber assortment only to a very small extent. With the Lucchimeter measuring method (elasticity tester) and the stress wave nondestructive evaluation technique spruce (Picea abies) and fir (Abies alba) wood panels are investigated which are destined for the production of guitars. The methods used as well as the results of measurement are compared with another. Furthermore the quantity of sales of resonance wood is presented after survey at the state owned forest management in Germany. The established small quantity of existing resonance wood is attributed to the sales of resonance wood not mentioned explicitly or described in detail. All in all the amount of resonance wood is supposed to be higher.
Forfattere
Bjørn ØklandSammendrag
Det er ikke registrert sammendrag
Forfattere
Dale W. Johnson Trine Aulstad Sogn Sheila KvindeslandSammendrag
The nutrient cycling model (NuCM) is a stand level model that depicts the cycling of N, P, K, Ca, Mg, and S on daily, weekly or monthly time scales. NuCM has been applied to several forest ecosystems (ponderosa pine, red spruce, beech, eastern deciduous, loblolly pine, slash pine, Scots pine, and Norway spruce) to simulate the effects of changing atmospheric deposition, harvesting, species change, precipitation quantity, increased temperature, elevated CO2, and liming. In some cases (e.g., harvesting, liming), the model output has matched field data quite well; however, it cannot be known whether the model does so because it accurately portrays nutrient cycling processes or simply because of chance. In other cases, NuCM simulations have either failed to match field data (as in the case of the observed chromatographic response of soil solution cations to a nitrate pulse in a beech forest) or produced results that are counterintuitive but as yet untested (as in the case where increased N translocation caused increased leaching). In that the primary purpose of these simulations has been heuristic rather than predictive, the simulation outputs that are either inconsistent with field data or counter-intuitive are of greatest interest. This review of NuCM applications led to the conclusion that the model has been more successful in matching decadal-scale changes in nutrient pools and soils and less successful in capturing intra-annual variations in soil solution chemistry. The NuCM model, like all models, can use improvements and these have been suggested; however, the model as it is has provided valuable insights into nutrient cycling in forest ecosystems, including the potential for short-term soil change and the great importance of nutrient translocation in N cycling.
Forfattere
Sondre Skatter Bohumil KuceraSammendrag
Det er ikke registrert sammendrag
Forfattere
V.R. Nsolomo Kåre Olav Venn Halvor SolheimSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Harald Kvaalen Halvor SolheimSammendrag
We have studied how callus cultures from two clones of Norway spruce influence the growth of two pathogens, Ceratocystis polonica and Heterobasidion annosum, when co-cultivated in vitro. In field experiments, trees of clone 409 were susceptible to both fungi, whereas clone 589 was less affected. Callus was cultured on medium containing cytokinins (benzylaminopurine, kinetin) and with or without auxin (2,4-dichlorphenoxy acetic acid). For co-cultivation with fungus, one piece of callus was placed towards the edge of each Petri dish. One and 14 days after inoculation with callus the dishes were co-inoculated with the fungus. Both clones strongly stimulated the initial growth of both fungi. Clone 589 inhibited the growth of both fungi when the fungi were inoculated one day after the callus. When the callus was cultured on medium without auxin for 14 days before co-inoculation clone 589 strongly inhibited the growth of both fungi, whereas clone 409 inhibited H. annosum only.
Forfattere
Jan Mulder J.F. Gallardo Lancho E. Matzner Edward Tipping Charlotte Bryant Nicholas Clarke S. Lofts B. Michalzik A. Vicente EstebanSammendrag
Det er ikke registrert sammendrag
Forfattere
Kåre Olav VennSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag