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 GROUPS

Historical Natural Fire Regimes map -- version 2000
USFWS uses the national, coarse-scale classification of five fire regime groups based on frequency and severity:

I. Frequent (0-35 years), low-severity

II. Frequent (0-35 years), stand replacement severity

III. 35-100+ years, mixed severity

IV. 35-100+ years, stand replacement severity

V. 200+ years, stand replacement severity

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