Lecture 17 Tuesday, September 30, 2007 • Fire Ecology – Influences on fires • Fuels • Weather • Topography – Fire Regime and Types of Fire • Size • Intensity • Severity (Fire severity is a fire effect used as substitute for intensity) • Low severity • High severity • Mixed severity • Frequency • Frequent and infrequent • Three basic fire types: • Surface fires • Ground fires • Crown fires (a fire that burns in the canopy of live and dead foliage and branches)—three types: • Active Crown Fire • Passive Crown Fire • Independent Crown Fire – Plant adaptations to fires • Avoid fire damage • Fire-resistant foliage (e.g. low resin content)• Thick fire-resistant bark • Evanescent lower branches • Recover following fire damage • Sprouting behavior • Colonize after fire • Post-fire germination (scarification of seed, ability to germinate and survive in open post-fire sites) • Cone serotiny – Fire suppression • Healthy Forest Restoration Act • Fire frequency and fire
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