Wildfire-Driven Forest Conversion in Western North American Landscapes.

Area of Science:

• Forest Ecology
• Climate Change Science
• Disturbance Ecology

Background:

• Forest ecosystems possess resilience to disturbances, but changing climate and disturbance regimes can exceed this capacity.
• High-severity fires, coupled with factors like limited seed sources, warmer/drier postfire conditions, and frequent reburning, can hinder forest recovery.
• Loss of resilience may result in forest conversion to different vegetation types, altering dominant species, life forms, and ecosystem functions.

Purpose of the Study:

• To synthesize evidence of fire-driven forest conversion in western North America.
• To understand the underlying causes of forest conversion.
• To assess the predictability of forest conversion and identify knowledge gaps.

Main Methods:

• Literature synthesis of existing research on fire-driven forest conversion.
• Analysis of factors contributing to forest resilience loss and conversion.
• Evaluation of current predictive capabilities for forest conversion.

Main Results:

• Growing evidence indicates widespread fire-driven forest conversion across western North America.
• Key drivers include altered fire regimes, climate change, and postfire environmental conditions.
• Predicting conversion remains challenging due to complex interactions and uncertainties.

Conclusions:

• Forests are increasingly vulnerable to fire and climate change, necessitating adaptive management strategies.
• Management approaches must acknowledge the potential for enduring forest type shifts.
• Applied research, co-produced by scientists and managers, is crucial for informed decision-making in changing landscapes.