Introduction to Fire Ecology - PowerPoint PPT Presentation

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Introduction to Fire Ecology

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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 ... – PowerPoint PPT presentation

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Title: Introduction to Fire Ecology


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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