Pine trees of what diameter are capable of withstanding a ground fire?

Pine trees of what diameter are capable of withstanding a ground fire?

• A. 1 inch
• B. 2 inches
• C. 3 inches
• D. 4 inches

Answer: (C)

The main idea is that tree survival during a ground fire depends on how well the trunk is insulated from heat by its bark. Bark thickness increases with diameter, so larger trees are better at protecting the living tissues inside from heat that travels up from the soil. For pine trees, a diameter of about three inches gives enough bark insulation to withstand the heat of a typical ground fire encountered in prescribed burns. Smaller trees, around one to two inches, have thinner bark and are more likely to have the cambium damaged or killed, making them unable to survive. While larger diameters (like four inches) would also survive under many conditions, three inches is a commonly cited threshold that reflects the general balance between heat exposure and bark protection in these scenarios.

The main idea is that tree survival during a ground fire depends on how well the trunk is insulated from heat by its bark. Bark thickness increases with diameter, so larger trees are better at protecting the living tissues inside from heat that travels up from the soil.

For pine trees, a diameter of about three inches gives enough bark insulation to withstand the heat of a typical ground fire encountered in prescribed burns. Smaller trees, around one to two inches, have thinner bark and are more likely to have the cambium damaged or killed, making them unable to survive. While larger diameters (like four inches) would also survive under many conditions, three inches is a commonly cited threshold that reflects the general balance between heat exposure and bark protection in these scenarios.