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Introduction to Fire Ecology

Introduction to Fire Ecology. The Natural Variability Concept. Fire Regime Characteristics. Frequency : the number of fires in a given time. This can be expressed in a number of ways: Probability : decimal fraction of events/yr

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Introduction to Fire Ecology

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  1. Introduction to Fire Ecology The Natural Variability Concept

  2. Fire Regime Characteristics • Frequency: the number of fires in a given time. This can be expressed in a number of ways: • Probability: decimal fraction of events/yr • Return Interval: the inverse of probability; years between events • Fire rotation or fire cycle: time needed to disturb an area equal in size to the study area

  3. Fire Regime Characteristics • Extent: area disturbed in a given event or during a given time period • Magnitude: described by either: • Severity: biological effects of the fire (e.g. % trees killed) or • Intensity: physical force or energy released by the fire • Seasonality: season when the fire occurs

  4. Fire Regime Characteristics • Variability can be critical! • The fire regime characteristics include the MEAN frequency, severity, size and season • However, the VARIABILITY in frequency, severity, size and season can also play a key role in shaping ecosystem structure and function

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