Forests health condition is improving

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The trees health condition in Norwegian forests have improved for most of the country. The tendency from previous years are continuing. The exception is the territory Østlandet (south-east of Norway) where there have been a decline for spruce. The national Monitoring Programme for Forest Damages are performed by Skogforsk, NIJOS and NILU.

The national Monitoring Programme for Forest Damages summarises the vitality of conifers and broadleaves as assessed in 2004 for the entire forested area of Norway, and presents the development of key crown condition parameters.

The crown density increased in 2004 for Norway spruce and Scots pine, while a small decrease was observed for birch as compared to 2003. In each year in the period from 1989 to 1997 did observed crown density for Norway spruce and Scots pine decline.

There has been an increase in crown density during the last 6 years and it is now at the same level as when the monitoring started in 1989.

There were a larger fraction of older spruce and birch trees having more then 10% discoloration than last year, while the amount of pine trees remained at the same level.

Forests health condition is improving

Older trees have in general lower crown density and more discolouration than younger trees. Damages from various leaf-eating insects were recorded on 38,3% of the birch trees.

The mortality remains generally low. The forest in the north boreal vegetation zone and the forest of the counties of Sør- and Nord-Trøndelag, have lower crown density, more discolouration and older trees compared with the rest of the country.

Forests health condition is improving

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