Shrub Fuel Models

Shrub layers that are three to six feet high present a deep fuel bed, with fine fuels (leaves, litter) exposed throughout the fuel bed, leading to potential for long flame lengths and high energy release during fires. Most often wind does not affect fire spread of shrub fuels - unless stronger than 8 mph at mid-flame height. Shrubs are found in most ecosystems. In pine-flatwoods and pocosins on the Coastal Plain, palmetto, wax myrtle, and gallberry are the dominant shrubs. They contain oils and other volatiles that burn readily, and they often form a dense understory and midstory, making up 35-40% of total cover. In the upper Piedmont and mountains, rhododendron and mountain laurel are common shrubs that also increase fire intensity.

Shrub fuel models make up FPBS models 4-7.