Immediate Effect of Fire
Sweetbay is often top-killed by fire, but survival of large diameter stems in low-severity fires is possible.
|In an experiment conducted in the late summer and early fall, sweetbay trees with 0.2-inch thick bark reached a lethal cambium temperature of 140 Â°F (60 Â°C) in 30.8 seconds when a standard heat source was applied to the bark. Trees with 0.3-inch thick bark took an average of 67 seconds, and those with 0.4-inch thick bark took 152 seconds to reach the lethal temperature. Time to reach lethal cambium temperature also increased with increasing diameter at breast height. Trees with a DBH of 9.1 to 11.0 inches (23-28 cm) took just under 100 seconds, and those with a DBH of 15.1 to 17 inches (38-43 cm) took a little over 300 seconds . Bark thickness of mature sweetbay trees is generally 0.5 to 0.75 inches (1.3-1.9 cm) . In southern pine stands, sweetbay bark thickness ranged from 0.1 to 0.3 inch (2.5-7 mm) for trees with 3.9-5.5-inch (10-14 cm) DBH .|
Â© 2002 Steven J. Baskauf
- 50. Hare, Robert C. 1965. Contribution of bark to fire resistance of southern trees. Journal of Forestry. 63(4): 248-251. 
- 90. Nanko, Hiroki; Cote, Wilfred A. 1980. Bark structure of hardwoods grown on southern pine sites. Renewable Materials Institute Series No. 2. New York: Syracuse University Press. 56 p. 
- 75. Maisenhelder, Louis C. 1970. Magnolia (Magnolia grandiflora and Magnolia virginiana). American Woods. FS-245. [Washington, DC]:U.S. Department of Agriculture, Forest Service. 7 p. 
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