Advertisement Advertisement
Advertisement Advertisement

Swedish approach to sustainable wood use highlighted in new IRENA report

Active forest management has helped to expand Sweden’s forested areas and thereby boost the country’s wood and bioenergy resource base. While about three-quarters of annual growth is harvested, those areas are replanted. The other quarter of each year’s growth is left in place to provide ongoing carbon uptake and maintain ecological stability. The Swedish experience offers valuable lessons for emerging markets according to a new report by the International Renewable Energy Agency (IRENA).

A pile of logging residues at roadside, covered with a paper wrap to aid air drying, will be used for energy at a local biomass-fired heat plant and/or combined heat and power (CHP) plant.

A fairly common sight in Sweden – a pile of logging residues at roadside, covered with a paper wrap to aid air drying, that will be used for energy at a local biomass-fired heat plant and/or combined heat and power (CHP) plant. Not all harvesting site ecologies or economies permit the removal of logging residues and at least 20 percent is to be left on site.

Authored by the International Renewable Energy Association (IRENA) together with the Swedish Bioenergy Association (Svebio) and the Swedish Energy Agency, the report “Bioenergy from boreal forests: Swedish approach to sustainable wood use” highlights that the wood energy potential could be further enhanced by collecting a larger share of logging residues.

Wood is typically harvested around every sixty to one hundred years, allowing for faster-growing new trees to be planted, increasing forest mass. In this manner, the capacity of Swedish forests to absorb carbon dioxide (CO2) and provide wood for energy and other uses has doubled over the last century.

Actively managed and monitored forests are also more resistant to forest fires and infestations, reducing the risk of massive CO2 release from such catastrophes.

Room for increased bioenergy removals

Just over half of Swedish forest fellings come in the form of roundwood from tree trunks, which are harvested for lumber, other wood products, pulp, and paper. While processing residues are already converted to bioenergy, felling residues – such as tree stumps and “slash” from branches and small trees – could also provide a sustainable bioenergy source.

Among other findings:

  • Sustainable wood use from Swedish logging could rise seven-fold by collecting 70 percent of slash and 30 percent of stumps.
  • Wood growth in Swedish forests each year is twice what it was a century ago – on about the same land area.
  • Every tonne of wood used in Swedish buildings avoids nearly three tonnes of CO2 emissions.

Although the market for wood-based heat and power to displace fossil-based fuel oil is largely saturated in Sweden, further wood resources could be redirected to other biofuel production, including jet fuel.

A cut-to-length harvester bucking a log directly after felling the tree in the forest.

A cut-to-length harvester bucking a log directly after felling the tree in the forest.

Meanwhile, the carbon uptake potential from forests could be enhanced through focused application of fertiliser. Further carbon uptake could be achieved in buildings by replacing materials like steel and concrete with more lumber and wood-residue composites, the report notes.

We're using cookies. Read more