Storm “Lothar” has changed forest management
Published: Wednesday, Dec 18th 2024, 10:10
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25 years after the "Lothar" storm, the Swiss forest is better prepared for such a once-in-a-century event. According to the Swiss Federal Institute for Forest, Snow and Landscape Research, important lessons have been learned from the disaster.
Hurricane "Lothar" swept across Switzerland on the morning of December 26, 199. 14 people died. The storm also threw 14 million cubic meters of wood to the ground. This made it by far the most severe winter storm in Europe and in Switzerland in terms of forest damage, as the Swiss Federal Institute for Forest, Snow and Landscape Research (WSL) announced on Wednesday.
"Lothar showed us the damage that extreme events can cause," Thomas Wohlgemuth from WSL was quoted as saying in the press release. In the Central Plateau, the extent was unprecedented, one would say "unbelievable today". According to the research institute, a further 17 forest owners lost their lives during the clean-up work, as well as two people in public forestry operations.
Wood prices rose
In the years that followed, the Federal Office for the Environment (FOEN) estimated the total damage at CHF 1.35 billion, CHF 600 million for buildings and CHF 750 million for the forest. In total, two percent of trees in Switzerland were knocked over or snapped.
The cantons of Bern, Fribourg, Lucerne and Nidwalden were the hardest hit by the hurricane, which moved from northern France across southern Germany and Switzerland to Austria with peak winds of up to 272 kilometers per hour (km/h).
As a result, the forestry and timber industry was hit hard. Prices for round timber fell by around a third due to the oversupply in spring 2000.
The bark beetles followed
After the storm, and then especially after the hot year of 2003, mass propagations of bark beetles added almost two thirds as much damaged wood as the storm itself. When powerful storms overturn forests over large areas, a strong increase in bark beetles almost always follows in spruce-rich stands for several years, as the WSL explained.
This first affects the edge of the storm areas, then the adjacent, weakened stand. Particularly in low-lying areas, it is therefore important to clear damaged spruce trees, i.e. those trees that are preferred by bark beetles, as quickly as possible.
Spruce is not actually native to the Central Plateau. However, the forestry industry has planted large areas of spruce because it is well suited to timber production.
More robust forests
According to the WSL, spruce trees are now much rarer on the Central Plateau. This means that the forest is better prepared for a storm event of the century than in 1999.
According to the WSL, trees 10 to 20 meters high are now standing again where the forest was on the ground 25 years ago. Many deciduous tree species that are considered climate-resistant, such as oak, cherry, sycamore and Norway maple, have grown back in the storm areas.
As studies by the research institute show, many forests became richer in structure after the storm, creating new habitats for many animal and plant species. According to the WSL, insect diversity has virtually exploded as a result. A study by the Swiss Ornithological Institute also showed that woodpeckers were able to benefit from Lothar as they feed on insects under the bark of trees or in rotten wood.
However, it can be assumed that major storms will occur again sooner or later, according to the research institute. Stronger storms than Lothar are difficult to imagine in Europe, but cannot be ruled out with climate change.
©Keystone/SDA
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