Most recent information about forest resources is now available from the Statistical Services of the Natural Resources Institute Finland (Luke). Whole-country results are based on calculations made in 2014–2016 during the 12th National Forest Inventory (NFI12). In addition, calculations made in 2012–2013 during NFI11 have been used to compile regional results.
– According to the most recent information about forest resources, the total volume of growing stock on forest land and poorly productive forest land is 2,464 million cubic metres. Of this total volume, pine accounts for approximately half, spruce covers 30 per cent and birch and other deciduous trees account for 20 per cent. Compared with the previous inventory (NFI11), the growing stock volume has increased by five per cent, says Principal Scientist Kari T. Korhonen from Luke.
The mean growing stock volume on forest land is 113 cubic metres per hectare. The average volume is 143 cubic metres per hectare in Southern Finland and 86 cubic metres per hectare in Northern Finland. Of all regions, the highest tree stock volume per hectare is in Kanta-Häme (171 cubic metres per hectare).
The growing stock has become sturdier and growth has increased
The growing stock volume with a diameter at breast height (DBH) of more than 20 cm growing on forest land is 1,341 million cubic metres, comprising 56 per cent of the total growing stock volume. Compared with the results of NFI11, the growing stock volume with DBH of more than 20 cm has increased by nine per cent and that of tree stocks with DBH of less than 20 cm has decreased by one per cent.
Highest growth in Päijät-Häme
The mean annual of growing stock on forest land and poorly productive forest land totals 110 million cubic metres. Compared with the previous inventory, annual increment has increased by four per cent. Mean annual increment is 4.8 cubic metres per hectare in the whole of Finland. The highest mean annual increment is in Päijät-Häme (8.2 cubic metres per hectare), while the lowest mean annual increment is in Lapland (2.1 cubic metres per hectare). However, total growth is the highest in Lapland, where annual increment of growing stock was 13.7 million cubic metres per year.
Highest volumes of decayed wood and other dead trees in Åland and Lapland
The mean volume of decayed wood and other dead trees on forest land is 5.7 cubic metres per hectare. The highest volume of dead wood is in Åland (10.8 cubic metres per hectare) and Lapland (9.8 cubic metres per hectare). Since the previous inventory, the amount of deadwood has increased by 16 per cent in Southern Finland and decreased by five per cent in Northern Finland.
The drainage status of peatlands has increasingly shifted to fully drained peatland forests. The area of recently drained peatlands and transitional peatlands has decreased from the previous inventory. Forestry lands incorporate 3.2 million hectares of fully drained peatland forests, covering 70 per cent of all drained peatlands.
The results for the whole country have been calculated using the measurements of NFI12 during the years 2014–2016. Regional results have been calculated using the measurements of last five years (2012–2016) in NFI11 and in NFI12. In Åland and in Northern Lapland only the measurements of NFI11 have been made for the present.