What is the term for a fuelbed that burns on and near the ground, often with smoldering?

What is the term for a fuelbed that burns on and near the ground, often with smoldering?

• A. Crown fire.
• B. Ground or duff/peat fire (smoldering organic soils).
• C. Surface fire.
• D. Backfire.

Answer: (B)

Fires that burn within the underground or just at the surface layer of organic matter are described as ground fuels, such as a duff or peat fire. This happens when the fuelbed consists of decaying litter, downed wood, or organic soils that lie below or at the surface. The combustion is often smoldering rather than flaming, because heat is stored in the soil and oxygen access is limited, so flames are minimal and the fire can persist for long periods. This is different from a canopy or crown fire, which uses living or dead material in the tree tops and spreads through the treetops. It also differs from a surface fire, which burns the fuels on the ground surface with visible flames, usually in grasses, leaves, and fine fuels. And backfire refers to a fire strategy or a fire that burns toward its source to control spread, not to a specific fuelbed type.

Fires that burn within the underground or just at the surface layer of organic matter are described as ground fuels, such as a duff or peat fire. This happens when the fuelbed consists of decaying litter, downed wood, or organic soils that lie below or at the surface. The combustion is often smoldering rather than flaming, because heat is stored in the soil and oxygen access is limited, so flames are minimal and the fire can persist for long periods.

This is different from a canopy or crown fire, which uses living or dead material in the tree tops and spreads through the treetops. It also differs from a surface fire, which burns the fuels on the ground surface with visible flames, usually in grasses, leaves, and fine fuels. And backfire refers to a fire strategy or a fire that burns toward its source to control spread, not to a specific fuelbed type.