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- Title
Characterization and quantitative assessment of interspecific and intraspecific penetration of below-ground vegetation by cogongrass ( Imperata cylindrica (L.) Beauv.) rhizomes.
- Authors
Holly, D. Christopher; Ervin, Gary N.
- Abstract
Cogongrass ( Imperata cylindrica (L.) Beauv.), an invasive C4 perennial grass, negatively influences native plant communities by forming dense monotypic stands that alter ecosystem properties and lower local species diversity. A hypothesized mechanism by which cogongrass achieves competitive dominance is a novel use of below-ground vegetative disturbance of neighboring vegetation (i.e. puncturing). However, very little empirical evidence is found in the peer-reviewed literature to quantify this phenomenon, much less establish it as a true form of competitive interaction. The present field study was conducted to quantify the occurrence of rhizome-mediated, below-ground vegetative penetration, both interspecifically and intraspecifically, document how this phenomenon is influenced by spatial location relative to the cogongrass stand, and determine the role that above-ground and below-ground biomass might have in the process. Analyses of 100 sod samples indicated that rhizome-mediated, below-ground vegetative penetration is a much larger intraspecific phenomenon than an interspecific one. The data also strongly suggested spatial location as a significant factor, with most penetrations occurring in the interior of a cogongrass stand as opposed to the advancing border. Significant correlations between rhizome-mediated, below-ground vegetative penetration and above-ground cogongrass biomass were found in the overall plot analysis and most strongly in the advancing border of the cogongrass stands.
- Subjects
COGON grass; INVASIVE plants; PLANT communities; SPECIES diversity; BIODIVERSITY; PLANT biomass; VEGETATION management
- Publication
Weed Biology & Management, 2006, Vol 6, Issue 2, p120
- ISSN
1444-6162
- Publication type
Article
- DOI
10.1111/j.1445-6664.2006.00198.x