FIRE EFFECTS
SPECIES: Sorbus americana | American Mountain-Ash 



IMMEDIATE FIRE EFFECT ON PLANT : 
While no direct documentation on the immediate effect of fire on
American mountain-ash was available, it is reasonable to presume that it
is readily top-killed by fire due to its thin bark and small stature.


DISCUSSION AND QUALIFICATION OF FIRE EFFECT : 
NO-ENTRY


PLANT RESPONSE TO FIRE : 
On Isle Royale, Michigan, American mountain-ash was found sprouting from
the stumps 5 years after a wildfire [9].

Ohmann and Grigal [37] reported a steady increase in the size of
individual American mountain-ash stems but no increase in the number of
individuals in the first 5 years after wildfire in Minnesota.


DISCUSSION AND QUALIFICATION OF PLANT RESPONSE : 
NO-ENTRY


FIRE MANAGEMENT CONSIDERATIONS : 
In red spruce stands that are logged and burned (either by prescribed
fire or wildfire), hardwoods, because they sprout from the stumps, tend
to overtake the spruce regeneration.  American mountain-ash was found to
have a density of 80 stems per acre (200/ha) on a site that had been cut
then burned twice (8 and 10 years before the study).  The large amount
of residue occurring when red spruce stands are logged increases the
risk of severe fires that can reduce spruce regeneration [24].

Related categories for Species: Sorbus americana | American Mountain-Ash