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Mechanisms Underlying Nonindigenous Plant Impacts: A Review of Recent Experimental Research

Published online by Cambridge University Press:  20 January 2017

Tanya C. Skurski ,
Lisa J. Rew  and
Bruce D. Maxwell
Tanya C. Skurski*
Affiliation:
Bureau of Land Management, Lander, WY 82520
Lisa J. Rew
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717
Bruce D. Maxwell
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717
*
Corresponding author's E-mail: [email protected]
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Abstract

Nonindigenous plant species (NIS) can affect individuals, communities, and ecosystems through numerous direct and indirect mechanisms. To synthesize the current understanding of how NIS cause impacts, we reviewed experimental research from the past decade. We found alteration of the microenvironment, such as incident light and air and soil temperature, was much more often a mechanism underlying NIS impacts than competition for soil water and nutrients. NIS litter frequently caused the alteration of microenvironments, and litter effects were often of greater consequence than the effects of live NIS plants. Results supported altered soil microbial communities and mycorrhizal associations as mechanisms underlying NIS impacts on native plant growth, community structure, and nutrient cycling. Impacts often could not be attributed to a single mechanism, highlighting the need for multi-factor studies that identify and distinguish between multiple, concurrently operating mechanisms. Overall, our synthesis indicates that effective management will require attention to legacy effects of NIS, that removing live NIS may not ameliorate impacts, and that removal of dead NIS biomass may be necessary for native species' survival. Furthermore, rehabilitating soil microbial and mycorrhizal communities may be crucial for successful post-NIS management revegetation.

Keywords

Competitionecological impactsexotic plantsinvasive plant speciessynthesis
Type
Research Article
Information
Invasive Plant Science and Management , Volume 7 , Issue 3 , September 2014 , pp. 432 - 444
Copyright
Copyright © Weed Science Society of America 

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