Increasing volume of growing stock
Agriculture, forestry, hunting and fishing
lst, The National Forest Inventory, timber, logs, productive forest area, growing stock, growth, quality class, felling class, spruce, pine, broad-leaved treesForestry , Agriculture, forestry, hunting and fishing

The National Forest Inventory2003-2007



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Increasing volume of growing stock

The volume of growing stock continues to increase. According to calculations from the National Forest Inventory the volume increased by 17 million cubic metres from 2006. The total growing stock in Norwegian forests is now 765 million cubic metres.

Annual increment inside bark, by tree species. 1933-2007. 1 000m3

Growing stock inside bark, by tree species. 1933-2007. 1 000m3

For the second year in a row the increment decreased slightly, but the annual increment seems to have stabilized at about 25 million cubic metres. In 1933, the annual increment was 10 million cubic metres.

More broad-leaved

Spruce is the most common species of tree with 45 per cent of growing stock, followed by pine with 33 per cent and broad-leaved with 22 per cent. During the last decades the share of broad-leaved has increased and spruce decreased. In 1967, spruce amounted to 52 per cent and broad-leaved 17 per cent. The share of pine has been stable in the period. Spruce amounted to 54 per cent of the annual increment, while the corresponding figures for pine and broad-leaved was 24 and 22 per cent respectively.

More spruce in Western Norway

Spruce was most common in the counties of Sør-Trøndelag and Nord-Trøndelag and represented 63 per cent of the volume of growing stock in these counties. In the well forested counties in the eastern part of Norway spruce also amounted to more than half of the volume. In the northern part of Norway, broad-leaved was most common with 62 per cent of the volume of growing stock. In the western parts of the country, the growing stock of spruce, pine and broad-leaved each amounted to approximately one third of the total volume. 15 years ago spruce only corresponded to one fourth of the volume.

Growing stock inside bark, by species of tree and surveyed regions. 2003-2007. 1 000 m3

Habitats for vulnerable an endangered species in forest

For the first time figures on habitats for vulnerable and endangered species in forest are included in the survey. For the country as a whole, dead wood lying is the most common of these kind of habitats and was found on 12 per cent of the productive forest area. The region with the counties of Hedmark, Østfold, Oslo and Akershus had the lowest occurrence of dead wood lying with 6 per cent. The same regional tendency was found for several other habitats.

The productive forest area below the coniferous forest line, except of Finnmark county, is estimated to 74 148 square kilometres. In addition, 17 100 square kilometres is considered as unproductive forest area. The total area of wooded land is approximately 120 000 square kilometres.