Journal News Feed – SJFR Volume 30, Issue 6, 2015

The journal news feed presents key findings from selected scientific articles from SNS’ scientific journal Scandinavian Journal of Forest Research. The summaries are personal interpretations of the content made by the editor of News & Views.

The journal news feed from Scandinavian Journal of Forest Research (SJFR) Volume 30, health Issue 6, order 2015 reviews four new interesting research articles.

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Vegetation control promotes growth in hybrid poplars

In a field trial in the south of Sweden, cialis different kinds of vegetation controls were compared in plantations of hybrid poplars. Manual removal of the vegetation, using a rake, in strips 50, 100 and 150 cm wide was compared with strips of polypropylene plastic mulch, the same widths. During the first year, mulching with plastic increased seedling growth more than manual vegetation control when performed over the same area. No such effect could be seen during the second year. Mulching positively influences the availability of water and nutrition during the early phase of sapling establishment. Time and costs for different alternatives need to be taken in account to make an optimal choice.

Read more in: Böhlenius, H. & Övergaard, R. 2015. Growth response of hybrid poplars to different types and levels of vegetation control. Scand J For Res 30(6), 516-525.

Tree retention – a powerful way to restore boreal production forest landscapes

The introduction of clear-felling practices in Sweden in the 1950s changed the forest landscape compared to natural conditions. For environmental reasons, tree retention is now practised, and in the long run this has the potential to restore important forest structures. In a computerized decision support system, the future state of a boreal forest landscape with various retention levels: no tree retention, 5 % and 20 % of the stand area, were calculated and visualized. Five per cent retention will only marginally modify the visual impression compared to clear-cuts, while 20 % cover will create a much more varied landscape. If tree retention is conducted over the long-term, it is a powerful restoration tool.

Read more in: Lämås, T. et al. 2015. Tree retention practices in boreal forests: what kind of future landscapes are we creating? Scand J For Res 30(6), 526-537.

Market prices of forest estates – more than the value of the trees

Since the de-regulation of the forest estate market in Sweden at the beginning of the 1990s, the average price of forest land has increased significantly. Previously, the net present production value of the forest land was used for pricing. This is no longer sufficient. This study used statistical methods to show how other factors such as size, shape, fragmentation, site productivity and capital density index affect the market price. Capital density index is positively correlated to the land value, but fragmentation and property size are negatively correlated to it.

Read more in: Sundelin, T. et al. 2015. Determinants of the market price of forest estates: a statistical analysis. Scand J For Res 30(6), 547-557.

Terosa, an interesting stump-lifting device in Finland

In 2013, the consumption of forest chips for energy in Finland was equivalent to 17 TWh, 16 % of which was produced from stump and root wood. An increase in the overall production of forest chips is intended, and it is thus urgent to create a cost-efficient supply chain for stump wood chips. Three different stump-lifting devices were compared in final fellings of Norway spruce in Finland. The stump-lifting costs with the Terosa device were around 37 % lower compared to the costs with the Väkevä and Xteho devices. The advantage of Terosa increased with increasing stump diameter.

Read more in: Palander, T. et al. 2015. Work system study of three stump-lifting devices in Finland. Scand J For Res 30(6), 558-567.