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.
2004
Abstract
No abstract has been registered
Authors
Inger Sundheim Fløistad Ketil KohmannAbstract
When spring frost occur on recently planted forest sites, severe damage may occur to the seedlings. The aim of the present study was to test how different levels of nutrient concentrations in the seedlings affected spring frost hardiness and time of bud break.Seedlings were grown in a greenhouse for one season and supplied with fertiliser containing 22, 43 and 72 mg N per litre respectively. The treatments resulted in needle nitrogen concentrations ranging from 0,9 to 1,8 % in the autumn.After winter storage at 0C, bud break was recorded on seedlings growing in greenhouse, outdoors and in growth chambers at 12C and at 17C. Freezing tests were performed on seedlings directly removed from winter storage and following one week growth in the greenhouse. Seedlings receiving fertiliser with 43 mg per litre had less freezing injury than the two other fertilisation treatments. The ealiest bud break occurred in seedlings receiving 72 mg per litre.
Authors
Guro BrodalAbstract
No abstract has been registered
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Authors
Peder GjerdrumAbstract
With wood, the moisture content is an intrinsic volatile property - constantly changing in accordance to the environment. For the efficient use of timber, knowledge about the MC is increasingly being requested, and the sawmill being required to reveal such information. This paper presents an algorithm for estimating, on a weekly basis, the running MC and MC variation of a timber lot. Input variables are the MC of the lot when leaving the kiln, storage condition and running weather observations. The model, described in mathematical terms, is valid for timber stored on stickers, i.e. under homogeneous air circulation, and meant for implementation in the sawmill’s MPS.
Authors
Peder Gjerdrum G. Arrighetti Mauro BernabeiAbstract
Resin pocket is a natural property considered one of the main drawbacks of spruce timber, particularly important for appearance and joinery applications. The resins, viscous by nature, might only be solidified at temperatures superior to conventional kiln drying.Induced in the active cambium by traumas of unknown origin, size as well as location of resin pockets are random. Surrounding annual rings appear unaffected, while on the microscopic scale discrepancies in cell structure are easily recognised. Ca. 200 resin pockets per m3 timber have been reported in Scandinavian timber. More resin pockets were experienced in boards sawn from the ca. 16% of logs demonstrating resin pocket in the crosscuts.
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No abstract has been registered
Abstract
Using Singular System Analysis (SSA), we extract a collection of significant long-term components (with dominant periods of at least 3 years) for a large number of river runoff records.At first glance, these long-term modes are a distinct feature of this variable, not contained in precipitation and temperature, and not easily correlated to commonly known long-term indices (NAO, SOI, NHT, SUN, etc.). However, low-pass filtered versions of these time series exhibit strikingly similar behavior, like common maxima, within a region (such as Southern Germany), pointing to a common origin.Although not an unequivocal example for synchronization, we quantify the degree of synchronization as a function of the regional extent of the data and propose a mechanism, stochastic resonance, discussed in climate dynamics, which is able to produce this collective behavior despite the lack of deterministic drivers. We also comment on air pressure-induced teleconnections between the different large scale oscillations in the climate system.
Authors
Line Hoem Erlend Ystrøm HaartveitAbstract
Major driving forces among companies in the forest products industry are mergers and acquisitions and narrowing the strategic focus to core competencies. The combined effect is that the mutual dependency in customer-supplier relationships increases, and that the share of the total value added provided by each actor decreases. Standard techniques for process mapping are intended as the first step in process improvement. Order processes, extending from identification of demand to fulfilment of demand, commonly cross company borders. The result is an increasing need for inter-company coordination to increase efficiency of material flows. This paper presents preliminary results from the mapping of the order process between a Norwegian retail chain and its major supplier of solid wood products. A model intended for supply chain mapping has been modified and applied to this particular case. One outcome of the mapping is that a detailed overview of the process can reveal simple solutions for process improvement, as individual actors rarely focus on optimising their combined process, but rather have an internal focus. The mapping also provides a basis for evaluation of existing performance measurements, and for development of new measurements with a focus on improving the actors’ combined order process.