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Revised results for consideration trees, snags and down wood after regeneration fellings.

Nyhet | Statistik - 29 October 2020

During 2020 calculation methods for the number and volume of consideration trees left after regeneration fellings have undergone review and quality control. This review identified incorrect database connections which have resulted in incorrect values in the published statistics covering the last 10 years.

All results in the latest statistical release refer to the revised figures. Regarding the effect of this revision on the interpretation of results and trends in the number and volume of consideration trees left, the previous large increase in number and volume now manifests as a small increase or unchanged condition based on the choice of distribution variable. Statistics regarding consideration areas are unaffected by this error.

The trend of increasing volume of hard dead wood continues

The results from the latest follow-up of monitoring of environmental considerations in the forest show that the volume of consideration trees and down wood in the country is 3.0 forest cubic meters per hectare and 3.5 cubic meters per hectare, respectively. The volume of consideration trees has been stable over time, except for seed and shelter trees, for which the negative trend appears to continue. With regards the total volume left for all substrate types, pine and spruce are the most common tree species.

In terms of the number of consideration trees, pine and birch are the most common tree species left as consideration trees in connection with regeneration fellings. Circa 1.5 pines and 1.5 birches are left per hectare.

The number of trees with a diameter >=45cm left after a regeneration felling has remained stable over time while the number of thinner trees has steadily decreased since the late 1990’s.

The trend of increasing volume of hard dead wood continues. The results from the last three-year period show that, for the country as a whole, the volume of hard dead wood left in connection with regeneration fellings is 2.9 cubic meters per hectare.

The results come from the regeneration measures that have been implemented, which means that the latest results relate to felling made for three years average 2009/2010 – 2011/2012. The inventory concerns primarily the number of standing trees left for conservation purposes and the volume of dead wood left in forests.

The environmental consideration areas left in connection with regeneration fellings are mainly tree groups, biotopes requiring consideration and protection zones. For the country as a whole, no significant changes are seen over time regarding the area environmental consideration areas left in connection with regeneration fellings.

Explanation

forest cubic meter (m3sk) standing volume (stem volume over bark from stump to tip).

All results can be found in the statistics database and in Statistical Reports.
The survey is a part of the Official Statistics of Sweden.

 

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