Journal news feed – SJFR Volume 29, Issue 3, 2014

The journal news feed presents the editors’ condensed summaries of key findings from selected scientific papers from SNS’ two scientific journals Scandinavian Journal of Forest Research and Wood Material Science & Engineering.

Journal news feed from Scandinavian Journal of Forest Research (SJFR) Volume 29, no rx Issue 3, cialis 2014.

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Selected articles

The amount of Dead Wood in a forest depends on how it is defined

The amount of dead wood is an important indicator of sustainable forest management. However, tadalafil a common, standard measure is lacking. In a survey based on the Swedish National Forest Inventory, the amount of dead wood recorded was 10.9 m3 per hectare when measured using the standard definition, which includes lying dead wood only when its diameter is greater than 10 cm. If all dead wood down to a diameter of 1 cm was included, the amount increased to 25 m3.

Read more in Söderberg, U. et al. 2014. The choice of definition has a large effect on reported quantities of dead wood in boreal forest. Scand J For Res 29(3), 252-258.

“Same procedure as last year”, despite storm Gudrun

Storm “Gudrun” struck Sweden in 2005 and felled 75 million m3. After the storm, many forest owners were warned not to continue planting only spruce, and instead to diversify the composition of their forest. This study concludes that forest owners primarily relied on experience-based knowledge, and ignored warnings of abstract risk. The forest owners still considered spruce to be a less risky alternative than other tree species.

Read more in Lidskog, R. & Sjödin, D. 2014. Why do forest owners fail to heed warnings? Conflicting risk evaluations made by the Swedish forest agency and forest owners. Scand J For Res 29(3), 275-282.

Retention Cutting triggers Coarse Root Growth by the remaining trees

Studies of tree growth after thinning and retention cutting have mostly focused on above-ground biomass. However, Pretzsch et al. excavated the soil so that they were also able to measure how root growth was affected by release. They found a significant increase in the resource allocation to the root system of the remaining trees. This means that the trees become mechanically stabilised after cutting. The study examined black spruce in Ontario.

Read more in Pretzsch, H. et al. 2014. Effect of variable retention cutting on the relationship between growth of coarse roots and stem of Picea mariana. Scand J For Res 29(3), 222-233.

High Browsing Pressure around Artificial Feeding Sites

Norway spruce is usually not preferred by browsing deer, but it is not spared if the browsing pressure is high enough. A study in southern Sweden showed that browsing is high around artificial feeding sites. If there is a shortage of alternative fodder around such sites, browsing on spruce is found as far away as 205 m from the feeding site. However, if there is an abundant field layer and deciduous trees around the site, spruce is not browsed at all.

Read more in Garrido, P. et al., 2014. Natural forage composition decreases deer browsing on Picea abies around supplemental feeding sites. Scand J For Res 29(3), 234-242.

High potential for Energy Wood when using tree tops

A Finnish study investigated the effects of different bucking and delimbing methods on pulpwood and energy wood yields in young thinning stands. They showed that, during whole-tree harvest, the energy wood yield could increase by 36-65 % if the minimum top diameter for pulpwood increased from 6-7 cm to 8 cm. If it increased to 10 cm, the energy wood yield is more than doubled.

Read more in Räisänen, T. & Nurmi, J. 2014. Impacts of bucking and delimbing alternatives on pulpwood and energy wood yields in young thinning stands in Finland. Scand J For Res 29(3), 243-251.