Canopy fuels are located in which part of the forest structure?

• A. In the tree canopy
• B. On the forest floor
• C. In the understory
• D. Underground

Answer: (A)

Canopy fuels are located in the tree canopy, the uppermost layer of the forest where the crown sits. These fuels include dry needles, small branches, cones, and other material in the crown that can burn rapidly when conditions are dry and heat is intense. Because they’re up in the canopy, fire can spread quickly through the crowns via flame contact and radiant heat, leading to crown fires that are much harder to control. Fuels on the forest floor feed surface fires, while understory fuels in the mid-to-lower layers can act as ladder fuels that help a fire climb into the canopy. Underground fuels reside in the soil and don’t drive canopy fire in the same way. So canopy fuels are in the tree canopy.