Published November 24, 2022 | Version v1
Journal article Open

How does management affect soil C sequestration and greenhouse gas fluxes in boreal and temperate forests? – A review

  • 1. Natural Resources Institute Finland
  • 2. Environmental Sciences Division, Oak Ridge National Laboratory, USA
  • 3. Aix Marseille Univ, Avignon Univ, France
  • 4. Faculty of Forestry, Technical University in Zvolen, Slovakia
  • 5. Forest Science and Technology Centre of Catalonia, Spain
  • 6. Basque Centre for Climate Change (BC3), Spain
  • 7. School of Biological Sciences, University of Aberdeen, UK
  • 8. Wageningen University and Research, Wageningen Environmental Research (WENR), The Netherlands
  • 9. Forestry and Forest Products Research Institute (FFPRI), Japan
  • 10. European Forest Institute, Finland
  • 11. Natural Resources Institute FinlandNatural Resources Institute Finland
  • 12. Amsterdam Institute for Life and Environment (A-LIFE), Vrije Universiteit Amsterdam, The Netherlands
  • 13. Earth Sciences, Vrije Universiteit Amsterdam, The Netherlands

Description

The global forest carbon (C) stock is estimated at 662 Gt of which 45% is in soil organic matter. Thus, comprehensive understanding of the effects of forest management practices on forest soil C stock and greenhouse gas (GHG) fluxes is needed for the development of effective forest-based climate change mitigation strategies. To improve this understanding, we synthesized peer-reviewed literature on forest management practices that can mitigate climate change by increasing soil C stocks and reducing GHG emissions. We further identified soil processes that affect soil GHG balance and discussed how models represent forest management effects on soil in GHG inventories and scenario analyses to address forest climate change mitigation potential. Forest management effects depend strongly on the specific practice and land type. Intensive timber harvesting with removal of harvest residues/stumps results in a reduction in soil C stock, while high stocking density and enhanced productivity by fertilization or dominance of coniferous species increase soil C stock. Nitrogen fertilization increases the soil C stock and N2O emissions while decreasing the CH4 sink. Peatland hydrology management is a major driver of the GHG emissions of the peatland forests, with lower water level corresponding to higher CO2 emissions. Furthermore, the global warming potential of all GHG emissions (CO2, CH4 and N2O) together can be ten-fold higher after clear-cutting than in peatlands with standing trees. The climate change mitigation potential of forest soils, as estimated by modelling approaches, accounts for stand biomass driven effects and climate factors that affect the decomposition rate. A future challenge is to account for the effects of soil preparation and other management that affects soil processes by changing soil temperature, soil moisture, soil nutrient balance, microbial community structure and processes, hydrology and soil oxygen concentration in the models. We recommend that soil monitoring and modelling focus on linking processes of soil C stabilization with the functioning of soil microbiota.

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Additional details

Funding

HoliSoils – Holistic management practices, modelling and monitoring for European forest soils 101000289
European Commission