The results of the National Forest Inventory (NFI) are now available also from the Statistical Services of the Natural Resources Institute Finland (Luke). The online service includes forest resource data presented on the national level and data from the most recent completed 11th inventory, also by region. The results of the ongoing 12th inventory (NFI 12) will be posted to the service in August.
The most recent forest inventory (NFI 11) was completed in 2009–2013. According to this inventory, there is a total of 26.2 million hectares of forestry land in Finland, of which 20.3 million hectares is forest land. Poorly productive forest land constitutes 2.5 million hectares, while unproductive land devoid or nearly devoid of trees totals to 3.2 million hectares. The surface area of forest land increased in the 1950s and 1960s as a result of the draining of peatlands. In the past few decades, no major changes have taken place in the surface areas of the various categories of forestry land.
‘Forestry land is categorised based on its timber production capability and is divided into forest land, poorly productive forest land, unproductive land, and forestry land with other purposes. The forestry land located within nature reserves is also classified as forestry land’, Eeva Vaahtera, Research Scientist at the Natural Resources Institute Finland points out.
Of the forestry land, 8.8 million hectares is peatland, of which 4.7 million hectares has been drained. Based on the effects of draining, drained peatland is categorised into recently drained peatlands, transitional peatlands, and drained peatland forests. According to NFI 11, drained peatland forests accounted for 2.8 million hectares of the drained peatlands, whereas less than 200 000 hectares of recently drained peatland areas remain.
‘The total volume of growing stock started to increase in the 1970s as a result of the significant increase in growing stock increment. Growing stock on forest and poorly productive forest land totals to 2.4 billion cubic metres. Of the total growing stock volume, pine accounts for approximately half and deciduous trees for approximately 20 per cent. The increment in the total volume has affected pine stocks the most. 90.1 per cent of the growing stock is growing on forests available for wood supply’, says Principal Scientist Kari T. Korhonen.
The annual increment of growing stock on forest land and poorly productive forest land totals to 105.5 million cubic metres. The annual growth rate has nearly doubled since the 1950s. Pine accounts for 46 per cent, spruce for 31 per cent, and deciduous trees for 23 per cent of the total increment.
The estimates of the maximum sustainable cutting possibilities for stem wood for the years 2011–2020 is 81 million cubic metres per year. The share of Southern Finland is 61 million cubic metres and Northern Finland 20 million cubic metres.