Which unit expresses basal area per acre in this stand?

Which unit expresses basal area per acre in this stand?

• A. m²/ha
• B. bd ft/ac
• C. ft²/ac
• D. cords/ac

Answer: (C)

Basal area is the total cross‑sectional area of all tree stems at breast height, expressed per unit land area. In U.S. forestry, that measurement is reported as square feet per acre, so ft²/ac is the appropriate unit. The other options mix volume units (bd ft/ac, cords/ac) or use a metric area per different land area (m²/ha) rather than per acre. So the cross‑sectional area per acre best aligns with ft²/ac.

Basal area is the total cross‑sectional area of all tree stems at breast height, expressed per unit land area. In U.S. forestry, that measurement is reported as square feet per acre, so ft²/ac is the appropriate unit. The other options mix volume units (bd ft/ac, cords/ac) or use a metric area per different land area (m²/ha) rather than per acre. So the cross‑sectional area per acre best aligns with ft²/ac.