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Responses of exotic plant species to fires in Pinus ponderosa forests in northern Arizona
Author(s) -
Crawford Julie A.,
Wahren C.H.A.,
Kyle S.,
Moir W.H.
Publication year - 2001
Publication title -
journal of vegetation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 115
eISSN - 1654-1103
pISSN - 1100-9233
DOI - 10.2307/3236610
Subject(s) - species richness , threatened species , seral community , ecology , introduced species , disturbance (geology) , flora (microbiology) , invasive species , fire ecology , abundance (ecology) , prescribed burn , geography , fire regime , biodiversity , environmental science , ecosystem , ecological succession , biology , habitat , paleontology , genetics , bacteria
. Changes in disturbance due to fire regime in southwestern Pinus ponderosa forests over the last century have led to dense forests that are threatened by widespread fire. It has been shown in other studies that a pulse of native, early‐seral opportunistic species typically follow such disturbance events. With the growing importance of exotic plants in local flora, however, these exotics often fill this opportunistic role in recovery. We report the effects of fire severity on exotic plant species following three widespread fires of 1996 in northern Arizona P. ponderosa forests. Species richness and abundance of all vascular plant species, including exotics, were higher in burned than nearby unburned areas. Exotic species were far more important, in terms of cover, where fire severity was highest. Species present after wildfires include those of the pre‐disturbed forest and new species that could not be predicted from above‐ground flora of nearby unburned forests.