Productive forest land

Last changed: 07 June 2016
ProdSkogsmark.jpg

Productive forest land is land that is suitable for forestry and that is not significantly used for other purposes. Production is at least 1 m³sk per hectare and year. There are cirka 23 million hectares of productive forest land in Sweden, equivalent to 57% of the land area, of which 0.8 million hectares are within national parks and nature reserves. Data presented here are productive forest land outside of the previously mentioned forms of resticted areas.

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Evergreens dominant - but broadleaves are increasing
As for all forest land in Sweden, productive forest land is dominated by evergreen forests (82%) with pine the most common stand type (39 %). Worth noting is that the exotic species Lodgepole pine accounts for 2,2% of the productive forest land area, and this proportion in southern Norrland is 4.6%. Since the midddle of the 1990's the area of broadleaved dominated forest has increased in all regions except northern Norrland. Seen for the whole country the area of broadleaved dominated forest has increased by 32% from 1985-2012.

Thinning stage forest is the most common
Maturity class is a classification of the forest from a forestry perspective. The dominant maturity class in productive forest land in Sweden is thinning stage forest (40%) and cirka 33% has reach the minium age for final felling. Approximately 6.4% of the productive forest area is thicket stage of which two thirds are artificially regenerated and the rest naturally regenerated forest.

Increased standing volume
The standing volume of productive forest alnd has increased steadily since the beginning of the 1900's and is currently cirka 3000 miljoner m³sk. This is an increase of 50% since the beginning of the 1950's. Behind this development is primarily a production and growth orientated forest management.

Since 1990 the standing volume of broadleaves has increased by 54% and currently represents 18% of the total standing volume.

The steadily increasing standing volume is occcured despite the fact that the area of productive forest land has remained relatively unchanged and this has meant that the forests have become more dense. Standing volume per hectare is currently 136 m³sk per hectare.

Significant increase in hard dead wood
Since The Swedish National Forest Inventory started collected data on all types of dead wood in the mid 1990's the total volume of dead wood has increased in all region except northern Norrland. This increase is dominated by hard dead wood. The totla volume of dead wood on productive forest land is 179 miljoner m³ or 8,0 m³ per hectare

Continued increase in both growth and drain
Similar to standing volume, growth has increased steadily in Sweden's forests and growth on productive forest land is crika 117 million m³sk.

Forest damage
The Swedish National Forest Inventory registers damage to trees which could affect timber production or quaility. The lowest level of forest damage is found in younder spruce stands in northern Sweden (23%) and highest i young pine stands in northern Sweden (55%). The most common type of damage in evergreens is mechanical damage. The proportion of broadleaves with at least one form of damage varies across the country from 34-61%.

Damage from Elk grazing
The proportion of young pine trees with fresh elk grazing damage has, since 2003, been between 8-25%. This level is clearly over the forestry sectors goal of 2%. The level of damage is highest in Götaland (23%), followed by Svealand (18%), northern Norrland (15%) and southern Norrland (9%). Elk grazing damage has shown an increasing trend under recent years.

Diagrams / Maps

Area conditions
Proportion (%) of productive forest land dominated by broadleaved trees
  
Area old forest
  
Proportion old forest (map)
          
Area older older forest with at least 3/10 broadleaved trees
  
Proportion older forest with at least 3/10 broadleaved trees (map)
        

Vegetation and site conditions
Vegetation coverage for ground layer species
  
Vegetation coverage for field layer species
  
Ground layer and field layer vegetation coverage
  

Standing volume and tree biomass
Total standing volume by tree species
  
Standing volume per hectare i older forest 
  
Trees per hectare with a diameter of at least 45cm
  
Volume dead wood by decay class
  
Volume deads wood per hectare by region
  

Annual volume increment
Mean annual volume increment, total drain and fellings
  

Forest damage
Proportion of pine stems with recent damage from Elk browsing
  
Defoliation in Scots pine
  
Defoliation in Norway spruce
  

About official statistics

SLU has been appointed by the Swedish government as resopnsible for the official statistics about the state and change of Swedens forests. Read more about SLU's official statistics. As an authority responsible for official statistics SLU must make sure that:

  • All statistics are objective
  • All statistics are well documented
  • All statistics are quaility assured

Official statistics must be made available without cost and also be accessable in electronic form.

All official statistics must be clearly marked maked with Offiicial Statistics of Sweden or bear the following logotype:

 

Publication plan for official statistics

JO0801 - Skogsdata - current statistics about the Swedish forests
JO0802 - Area conditions
JO0803 - Standing volume and tree biomass
JO0804 - Annual volume increment
JO0805 - Vegetation and site conditions
JO0806 - Forest damage

Current publication dates are shown in Statistics Sweden's publication calender.


Contact

Per Nilsson, Head of Analysis
The Swedish National Forest Inventory, SLU
per.nilsson@slu.se, +46 (0)90 786 8472

Page editor: riksskogstaxeringen@slu.se