A classification of fire regimes into a discrete number of categories based on frequency and severity. The national, coarse-scale classification of fire regime groups commonly used includes five groups:
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.
Source: National Wildfire Coordinating Group. 2012. Glossary of Wildland Fire Terminology. PMS 205. Accessed on 9 September 2013. Available at http://www.nwcg.gov