NDLI: Impacts of mixed severity wildfire on exotic plants in a Colorado ponderosa pine

Content Provider	SpringerLink
Author	Fornwalt, Paula J. Kaufmann, Merrill R. Stohlgren, Thomas J.
Copyright Year	2010
Abstract	The 2002 Hayman Fire burned with mixed severity across 55,800 ha of montane Colorado forest, including pre-existing plots that were originally measured for understory plant composition and cover in 1997. We examined the influence of the Hayman Fire on exotic plants by remeasuring these plots annually from 2003 to 2007. We found that (1) exotic richness and cover generally increased as fire severity and time since fire increased; (2) the exotic species present in a plot before the fire were also largely present in the plot postfire, regardless of fire severity; (3) most of the new postfire species in a plot were present elsewhere in the study area before the fire, although some new species were truly new invaders that were not found in prefire surveys; (4) lightly burned riparian forests were not more susceptible to exotic invasion than surrounding uplands that burned with similar severity; and (5) native and exotic richness and cover were positively correlated or uncorrelated for all fire severities and years. Our findings indicate that exotics were stimulated by the Hayman Fire, especially in severely burned areas. However, exotic richness and cover remain low as of 2007, and correlations between native and exotic richness and cover suggest that exotics have not yet interfered with native understory development. Therefore, we conclude that exotic plants are not a major ecological threat at present, but recommend that monitoring be continued to evaluate if they will pose a threat in future years.
Starting Page	2683
Ending Page	2695
Page Count	13
File Format	PDF
ISSN	13873547
Journal	Biological Invasions
Volume Number	12
Issue Number	8
e-ISSN	15731464
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-01-08
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Exotic plants Fire severity Pinus ponderosa Riparian areas Time since fire Developmental Biology Ecology Plant Sciences Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics Ecology

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