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Woody Shrubs as a Barrier to Invasion by Cogongrass (Imperata cylindrica)

Published online by Cambridge University Press:  20 January 2017

Lisa Y. Yager ,
Deborah L. Miller  and
Jeanne Jones
Lisa Y. Yager*
Affiliation:
Camp Shelby Field Office, The Nature Conservancy, Camp Shelby, MS 39407
Deborah L. Miller
Affiliation:
University of Florida, West Florida Research and Education Center, Hwy. 5988, Bldg. 4900, Milton, FL 32483
Jeanne Jones
Affiliation:
Mississippi State University, Department of Wildlife and Fisheries, Mississippi State, MS 39762
*
Corresponding author's E-mail: [email protected]
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Abstract

Cogongrass invades forests through rhizomatous growth and wind-dispersed seeds. Increased density and abundance of woody vegetation along forest edges may strengthen biotic resistance to invasion by creating a vegetative barrier to dispersal, growth, or establishment of cogongrass. We evaluated differences in dispersal of cogongrass spikelets experimentally released from road edges into tallgrass-dominated and shrub-encroached longleaf pine forests (Pinus palustris). Average maximum dispersal distances were greater in the pine–tallgrass forest (17.3 m) compared to the pine–shrub forest association (9.4 m). Spikelets were more likely to be intercepted by vegetation in pine–shrub forests compared to pine–tallgrass forests. Results suggest that dense woody vegetation along forest edges will slow spread from wind-dispersed cogongrass seeds.

Keywords

Bluestem grasses, Andropogon spp., Schizachyrium spp.cogongrass, Imperata cylindrica (L.) Beauv.longleaf pine, Pinus palustris Mill.Biotic resistanceinvasibilityinvasive barrierseed dispersal
Type
Research
Information
Invasive Plant Science and Management , Volume 4 , Issue 2 , April 2011 , pp. 207 - 211
Copyright
Copyright © Weed Science Society of America 

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