Seedlings Thirteen replicates of each of the 4 treatments were installed in June. Displacement of Sandhill Animals Burrowers. Florida Entomologist 78 1: Releases Made No releases have been made of any natural enemies. At 13 different sites across the forest, I dug a core from a random point within a dense cogongrass sward and transplanted it into sandhill vegetation burned 5 yr before. Cogongrass may be a desirable food for pocket gophers because its rhizomes are high in sugars and starches, as are other closely-related grasses such as Saccharum officinarum sugarcane Hunsigi

Rate of spread of the fire front was recorded between two 1. Staff at Withiacoochee State Forest speculate that cogongrass was accidentally introduced into the forest in roadfill from nearby clay pits infested with cogongrass, beginning at least 20 yr ago. In greenhouse studies, King and Grace a found cogon grass to be most sensitive to soil saturation during early establishment following seed germination. Biological Control of Weeds: Butler Shoemaker and Drechslera gigantea Heald and F. The vegetation of Florida sandhill is characterized by an overstory of Pinus palustris longleaf pine except in south-central Florida where Pinus elliottii var. Imperata cylindrica has two stamens and I.

Invasive nonindigenous plants can change fire regimes or, in the case gras invasive grasses, can initiate fire in ecosystems that were not formerly pyrogenic, resulting in the loss of indigenous species and alteration of important ecosystem processes, particularly nitrogen cycles D’Antonio and VitousekHobbs and Huenneke As a result of strong interactions between these biotic and abiotic processes and overlap within functional groups, the sandhill ecosystem is considered resilient to novel disturbance, perhaps including novel grass species.

cogon grass thesis

Biocontrol News and Information 8: Journal of the Arnold Arboretum Some of the most widely recognized of these are blady grass, alang-alang, lalang, cogon grass, and speargrass. Burrowing animal mounds differ in edaphic characteristics and microclimate from surrounding undisturbed areas, which may have implications for seedling recruitment Thewis and Stone Limited surveys also have been made in East Africa and Southeast Asia.

cogon grass thesis

Fire intensity is an expression of energy released per unit length of burning front per unit time, and is a function of abiotic factors such as weather and topography as well as fuel characteristics such as quantity, structure, and flammability likelihood of ignition. Today’s cogongrass in the southeastern United States may be the progeny of relatively few founder genotypes.


Ecological resilience of an ecosystem is greater when there is a diversity of driver species within each functional group. Displacement of Sandhill Animals Burrowers.

Ecological consequences of Imperata cylindrica (cogongrass) invasion in Florida sandhill

In order to compare recruitment success among various plant life-forms regardless of fire effectsI combined burned and unburned treatment data and compared recruitment success among the 5 species of planted seedlings. Recent burning in both firemanaged and formerly fire-excluded sandhill tended to grsss mean rates of spread, although not significantly.

grase This study will create opportunities that will develop his technical skills, realistic and practical precision, and knowledge in the application of engineering principles and theories that he has acquired in the academe. If novel disturbances cannot be absorbed because of low 6 diversity of driver species, then the ecosystem shifts to a new stability domain characterized by a different set of processes, structures, and species. Continued long-distance transport of cogongrass rhizomes across the Southeast could, therefore, result in mixing of clones that had been reproductively isolated.

After 1 or 2 growing seasons, I measured the perpendicular distance from a 10 m line connecting adjacent stakes to the farthest cogongrass tiller extending beyond the edge of the sward.

cogon grass thesis

Culms are mostly erect theeis unbranched, with reduced blades and open sheaths Holm et al. Cogon grass has been used in Southeast Asia as forage because it is the dominant vegetation on over million acres. A lignocellulosic fibrous material set chemically or mechanically.

Different letters represent significant differences at P 61 Table Biological Control of Weeds. Seed of 6 species Dalea pinnata, Pityopsis graminifolia, Sorghastrum secundum, Myrica cerifera, Serenoa repens, and Quercus geminata were collected from at least 12 individuals at or near Withlacoochee during the fall.


To compare effects of fire on survival and growth of established longleaf pine juveniles grass stage to 1. Gras borealis red-cockaded woodpeckerwhich nests only in vrass in mature pines; Aimophila aestivalis Bachman’s sparrowwhich nests on the ground in wiregrass clumps; Sciuris niger southeastern fox squirrel ; and Pituophis melanoleucus pine snakePeromyscusfloridanus Florida mouseand Drymarchon corais couperi eastern indigo snakeall of which inhabit gopher tortoise burrows.

The increase in rate of spread seen in Models III and IV is thedis with that demonstrated by a similar model of spread grazs an invading plant population with varying control of “satellite” populations Moody and Mack A review of the literature on insects associated with I.

Leaf sheaths can be hairy or smooth.

Ecological consequences of Imperata cylindrica (cogongrass) invasion in Florida sandhill

On these public lands, cogongrass control efforts range from aggressive chemical eradication, as in Ocala National Forest and Withlacoochee State Forest, to no control due to lack of funds or lack of awareness of coyon damaging potential.

If planting occurred on a mound created by a burrowing animal, then size and condition of the mound was noted. This Asian pine exists for several years in a grass stage that is resistant to drought and fire, again like longleaf pine. Tjesis determine if cogongrass influenced the occurrence of sandhill burrowing animals, I measured frequency of mounds of these 3 species of sandhill burrowing animals in adjacent sandhill with and without cogongrass.

It is notable that the circular infestation expanding on all sides exceeded the rectangular infestation expanding on only 3 sides in areal coverage after 14 yr. The remainder was air-dried overnight and refrigerated at 7 oC until field planting in June.

Since all of these management goals call for prescribed fire, I measured vegetative spread of cogongrass in fire-managed vs.