Balancing productivity and reliability in fire-prone boreal forests.

Area of Science:

• Forestry and Ecosystem Management
• Boreal Forest Ecology
• Disturbance Ecology

Background:

• Forests provide vital ecosystem services, including wood production, carbon sequestration, and biodiversity conservation.
• Increasing frequency of disturbances like forest fires necessitates strategies for reliable wood production alongside other ecosystem services.
• Boreal forests are particularly susceptible to fire, impacting their productivity and long-term stability.

Purpose of the Study:

• To investigate the trade-offs between wood production productivity and reliability in boreal forests under varying fire disturbance probabilities.
• To analyze how forest management decisions interact with fire risk to influence harvest stability and reliability.
• To assess the impact of mortality, fire frequency, tree species, and site fertility on forest productivity and reliability.

Main Methods:

• Utilized a landscape model integrating tree growth, self-thinning, fire-caused mortality, and forest management.
• Operationalized reliability through temporal stability of annual harvest and the frequency/magnitude of harvests falling below acceptable levels.
• Tested the influence of four key factors (mortality, fire frequency, tree species, site fertility) on productivity and reliability metrics.

Main Results:

• A common trade-off exists between high productivity and high reliability in wood harvesting.
• This trade-off intensifies with increased fire frequency, the planting of spruce, and higher site fertility.
• Landscape-scale management prioritizing high productivity in some stands negatively impacts neighboring stands' productivity and overall landscape reliability.

Conclusions:

• Forest management strategies must carefully consider the inherent trade-offs between maximizing wood production and ensuring its reliability, especially in fire-prone boreal regions.
• Higher fire frequency, specific tree species (spruce), and fertile sites exacerbate the productivity-reliability dilemma.
• Integrated landscape management is crucial to mitigate negative impacts on overall wood production reliability when aiming for high productivity in specific areas.