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Fire Regime Current Condition, v2000

Current Condition Classes are defined in terms of the relative risk of losing one or more key components that define an ecosystem. The Current Condition Class data were assigned to the generalized successional pathway diagrams created with the Historical Natural Fire Regimes data. These data were developed through the integration of four biophysical data layers: Digital Elevation Model, Kuchler's Potential Natural Vegetation (PNV), 4th-Code Hydrologic Unit delineations, and Ecological Subregions (Bailey's Sections). Three current vegetation layers were also used: Resource Planning Act's Forest Types and Forest Densities of the United States and USGS EROS Data Center's Land Cover Characterization database. Expert regional panels developed generalized successional pathway diagrams for all combinations of the Historical Natural Fire Regimes and modified PNV layers. Mapping and final refinements were made by assimilating generalized successional pathways with biophysical and current data layers.

Condition class

Attributes

Example management options

Condition Class 1

  • · Fire regimes are within or near an historical range.
  • · The risk of losing key ecosystem components is low.
  • · Fire frequencies have departed from historical frequencies by no more than one return interval.
  • · Vegetation attributes (species composition and structure) are intact and functioning within an historical range.

Where appropriate, these areas can be maintained within the historical fire regime by treatments such as fire use.

 

Condition Class 2

 

  • · Fire regimes have been moderately altered from their historical range.
  • · The risk of losing key ecosystem components has increased to moderate.
  • · Fire frequencies have departed (either increased or decreased) from historical frequencies by more than one return interval. This results in moderate changes to one or more of the following: fire size, frequency, intensity, severity, or landscape patterns.
  • · Vegetation attributes have been moderately altered from their historical range.

Where appropriate, these areas may need moderate levels of restoration treatments, such as fire use and hand or mechanical treatments, to be restored to the historical fire regime.

 

 

Condition Class 3

  • · Fire regimes have been significantly altered from their historical range.
  • · The risk of losing key ecosystem components is high.
  • · Fire frequencies have departed from historical frequencies by multiple return intervals. This results in dramatic changes to one or more of the following: fire size, frequency, intensity, severity, or landscape patterns.
  • · Vegetation attributes have been significantly altered from their historical range.

Where appropriate, these areas may need high levels of restoration treatments, such as hand or mechanical treatments. These treatments may be necessary before fire is used to restore the historical fire regime.

 

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Modified: Mar 11, 2014