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.
2006
Authors
Ingerd Skow Hofgaard Leslie A Wanner Gunhild Hageskal Birgitte Henriksen Sonja Klemsdal Anne Marte TronsmoAbstract
No abstract has been registered
Authors
Kjersti Holt HanssenAbstract
An increasing interest for uneven-aged forestry requires more knowledge concerning the impact of selective cuttings on the physical environment, and the effect of an uneven-aged forest structure on establishment and growth of the regeneration. Our objectives were to correlate pre-harvest growth and vitality of advance seedlings and saplings with light levels in the stands, and to measure the change in light availability following selective cuttings. We performed a selective cutting with two levels of removal (40 and 60 % of standing volume) in three uneven-aged stands in eastern Norway, two Norway spruce (Picea abies) stands and one Scots pine (Pinus sylvestris) stand. The standing volumes in the spruce stands were approximately 300 m3 ha-1, in the pine stand 180 m3 ha-1. The selective cutting was aimed at removing the economically ripe trees, resulting in the removal of large as well as damaged and diseased trees. Light levels were measured with hemispherical photography before and after cutting, and sapling growth and vitality was registered. Spruce sapling vitality and growth before cutting varied with light conditions. Saplings with good vitality on average received 26 % of full daylight. Few pine saplings had good vitality even though the average light level in the pine stand was 35 %, illustrating the difference in shade tolerance between the two species. The relationship between light levels and sapling growth might be caused by the availability of both light and soil resources, as a large gap will offer a better supply of nutrients and water as well as light. The selective cutting increased average light levels with 10-30 percent points. In the spruce forests, the frequency distribution curve of measured light values was rather narrow and peaked before harvesting but wide and low afterwards (Fig. 1), indicating that the selective cutting created a broad range of site conditions below the canopy. For the pine forest, the light distribution curve kept a rather narrow, unimodal shape also after cutting.
Authors
Jørgen Aleksander Mølmann Olavi Junttila Øystein Johnsen Jorunn Elisabeth OlsenAbstract
No abstract has been registered
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No abstract has been registered
Authors
Toril Drabløs EldhusetAbstract
No abstract has been registered
Authors
Toril Drabløs EldhusetAbstract
No abstract has been registered
Abstract
No abstract has been registered
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Abstract
No abstract has been registered
Abstract
No abstract has been registered