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Reviewing the Role of Wildfire on the Occurrence and Spread of Invasive Plant Species in Wildland Areas of the Intermountain Western United States

Published online by Cambridge University Press:  20 January 2017

Lisa J. Rew  and
Mara P. Johnson
Lisa J. Rew*
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717
Mara P. Johnson
Affiliation:
Center for Invasive Plant Management, Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717
*
Corresponding author's E-mail: lrew@montana.edu
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Abstract

Fire is unlikely to be a simple, deterministic process that will result in increased rates of invasion by nonnative plants. Relative dominance of nonnative plants at any postfire site likely results from a combination of factors, including propagule pressure (aboveground and belowground), time since invasion, interspecific competition, disturbance history, rainfall patterns, soil nutrients, environmental heterogeneity, land use, plus the actual fire dynamics. Consequently, the role different factors play in nonnative plant invasion is still relatively unexplained, and the possibility that wildfire may promote nonnative plant species remains a concern. Our aim was to evaluate the state of knowledge concerning how nonnative plant species establish, survive, and spread following wildfire in wildland areas for the main vegetation types of the Intermountain West. Although the particular invading species varied with vegetation type, the most frequently reported species were annual grasses (e.g., downy brome [Bromus tectorum], Japanese brome [Bromus japonicus]) and long-distance, dispersing forbs (e.g., Canada thistle [Cirsium arvense], common dandelion [Taraxacum officinale], and prickly lettuce [Lactuca serriola]). Overall, many of the reviewed studies found an increase, followed by a long-term decline, in nonnative species after wildfire, particularly when other disturbances were minimal. Regardless of this finding, many people consider rapid detection and control of new, nonnative plant populations after wildfire one of the most effective management activities. That axiom may be correct, if the nonnative propagule pressure is high and the anthropogenic disturbances are frequent, but if this is not the case the question to answer is whether immediate management, including reseeding, will benefit the system or whether off-target effects could make that approach undesirable. Continued investigation and increased quantitative analysis of the complex factors that likely contribute to changes in nonnative plants dynamics following wildfire should improve our understanding of the issue and assist managers in allocating limited resources.

Keywords

Canada thistle, Cirsium arvense (L.) Scop.dandelion, Taraxacum officinale G.H. Weber ex Wiggersdowny brome, Bromus tectorum L.Japanese brome, Bromus japonicus Thunb. ex Murr.prickly lettuce, Lactuca serriola L.Weedsnonindigenous plantsexoticswildlandsecosystem processeswildfirerestorationseedingdesert grasslandsmountain grasslandsdesert shrublandssagebrush shrublandspinyon–juniper woodlandsponderosa pine forestspruce forestlodgepole pinesubalpine fir forest
Type
Invited Review
Information
Invasive Plant Science and Management , Volume 3 , Issue 4 , December 2010 , pp. 347 - 364
Copyright
Copyright © Weed Science Society of America 

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