Managing Invasive Plants: Concepts, Principles, and Practices link

U.S. Fish Wildlife Service
America's National Wildlife Refuge System

MANAGING INVASIVE PLANTS: Concepts, Principles, and Practices

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Fire Regime Condition Classes

Fire Regime Current Conditions Classes map -- version 2000
The condition of lands is classified by land managers based on departure from the natural fire regime.

Condition Class 1: Fire regimes are within their historical range, with a low risk of losing key ecosystem components during a fire.

Condition Class 2: Fire regimes have been moderately altered from their historical range, with a moderate risk of losing key ecosystem components during a fire. Fire frequencies are one or more fire return intervals away from historical frequencies.

Condition Class 3: Fire regimes have been significantly altered from their historical range, which a high risk of losing key ecosystem components. Fire frequencies are multiple return intervals away from historical frequencies. Vegetation attributes have been significantly altered from their historical range.

Map credit: USDA Fire Sciences Laboratory, Rocky Mountain Research Station.