Hur många stubbar...

Senast ändrad: 12 december 2017

How many stumps can be harvested without negative effects on biodiversity?

  • Aim:  to estimate how many stumps that needs to be left at stump harvest to avoid negative effects on saproxylic organisms.

Project description: A report from the Swedish Energy Agency concludes that organisms living in dead wood could be negatively affected by stump harvest, the reason being that stumps constitute ca 80% of the dead wood on a clear-cut. The aim of this project is to estimate how many stumps that needs to be left at stump harvest to avoid negative effects on these organisms. To achieve this, we will utilize models that can produce species accumulation curves with dead wood volume as predictor. This will enable us to determine thresholds for how many stumps that must be left after stump harvest. The project is divided in two steps. The first step involves a validation of the model with respect to the ecological relevance of the assumptions that the model is built upon and the mathematical construction of the model. In the second step, we will collect insect with emergence traps from a large number of stumps. This data will be used to produce species accumulation curves that provides threshold for how many stumps that should be left after stump harvest to avoid negative impacts on wood living organisms.

The project is conducted in close collaboration with international researchers and with major Swedish forestry companies.

Funding: The Swedish forest agency.

Project leader:
Joakim Hjältén

Associated researchers:
Timothy Work
Thomas Ranius
Anders Musztha
Jon Andersson

Sidansvarig: bo-soren.wiklund@slu.se