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

作者：Yager Lisa Y^*; Miller Deborah L; Jones Jeanne

来源：Invasive Plant Science and Management, 2011, 4(2): 207-211.

DOI：10.1614/IPSM-D-10-00052.1

• Biotic resistance
• invasibility
• invasive barrier
• seed dispersal

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.

• 出版日期2011-6