The average temperature in Sweden has increased by 1-1.5 degrees in a comparison with the period 1950-1990.
This has led to the climate zones moving 5-10 kilometers north every year.
Something that has changed the conditions for which tree species works on different lands.
Spruces have in many places been planted on land where pine actually works better.
Among other things, this has been done because game damage to pine plants is much more common.
- Pine plants must be treated every year for several seasons with a non-toxic substance that causes the deer to become the plants.
Of course, it is both costly and time-consuming, says Jonas Bergquist.
Increased risk of forest damage
But spruce forest on land, which is better suited for pine, has with an increasingly warmer and drier climate increased the drought risk, as has the risk of root rot, storm felling and damage by spruce bark beetles and other pests.
Another piece of advice that forest owners receive from the Swedish Forest Agency is to, where possible, increase the proportion of deciduous trees in a forest.
With mixed forests, forest owners spread the risk of a tree species being damaged.
- Mixed forests require more care, which may discourage some forest owners, says Jonas Bergquist.
In the clip, the forest expert explains how a forest area outside Forserum has changed.