Nutritional analysis of cogongrass shoots “cogongrass” and of composite samples of sandhill grasses, herbs, and upper 2. Cogon grass, Imperata cylindrica , a a partial plant showing stems, leaves, roots and elongating rhizomes; b a stem with leaves; c plume-like inflorescence of many paired flowers. A similarity matrix for 1 primer based on the number of shared RAPD bands among the 10 sites showed that no 2 sites had a similarity value higher than 0. Finally, I focus on the dynamics of cogongrass invasion in Florida sandhill ecosystems and present this as a test case for determining whether an invasive species can erode ecosystem resilience to the point of causing a shift to a new type of ecosystem. Ecological consequences of Imperata cylindrica cogongrass invasion in Florida sandhill Creator:

Twelve of the “row-transects” were dominated by dense cogongrass and 12 were randomly located nearby in the same plantation without cogongrass. Culms are mostly erect and unbranched, with reduced blades and open sheaths Holm et al. Across its range, longleaf pine is found on poorly drained spodic soils in flatwoods ecosystems and on well-drained sandy soils in high pine ecosystems. Factors affecting glyphosate activity in Imperata cylindrica L. The leaf blades have a midvein which is clearly offset to one side, and serrated toothed edges.

Since all of these management goals call for prescribed fire, I measured vegetative spread of cogongrass in fire-managed vs. For example, feral ungulates are some of the most damaging introductions in national parks and preserves in the United States, where they disturb soil and facilitate dispersal of invading plants Coblentz Trass intensity values were consistent with published values for similar grassland ecosystems worldwide Frost and Robertson Imperata brasiliensis and I.

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

In Indonesia, the highest degree of gall-midge infestation on I. Several of the common woody species in Florida sandhill, including Quercus geminata sand live oakQuercus incana bluejack oakMyrica cerifera wax myrtleand Diospyros virginiana persimmonreproduce vegetatively by clonal growth as well as by seed. To investigate whether small thesi clones of cogongrass are capable of spreading into diverse intact sandhill vegetation, I transplanted plugs of cogongrass into sandhill.


This hypothesis is supported by the pattern of cogongrass distribution here, where it occurs in undulating bands, usually less than 35 m wide, along geass forest roads.

This may also serve as basis in conducting further researches related to this study. Plantings were also made on the firebreaks of the nearby 18 Withiacoochee Land Utilization Project. These pines may continue to grow in spite of a solid understory of cogongrass, but the longleaf pine overstory is merely an artifact of pre-cogongrass grasx.

cogon grass thesis

Most of the forage grasses successfully introduced into Australia are also African species Cox et al. The ability of Serenoa to establish from planted seed in dense cogongrass may be due to its large seed with a large endosperm that provides food for early seedling growth, enhancing its ability to compete with cogongrass during its first year of growth.

Lightning-ignited fires occur during the spring and summer when thunderstorms are most common.

cogon grass thesis

There was no interaction between vegetation and fire. To produce paper, it is necessary to cut down trees. Although Pinus 65 merkusii germinated well under dense cover of cogongrass, seedlings were then killed in frequent fires fueled by cogongrass, so that survival of pines beyond the grass stage was found to be highest when cogongrass was burned just before pine seed fall.

Zebra mussels thesks indigenous clams, and filter water so efficiently that phytoplankton and consequently zooplankton and pelagic fish decline sharply Caraco et 3 al. These data again suggest htesis low seed viability may be due to long-distances between clones of different genotypes, although variability in environmental conditions also influences seed formation and viability from year to year ConnorChapman Modified from Coile and Shilling, Nonindigenous shrub invasions have altered fire behavior in South African fynbos shrublands van Wilgen and Richardson A review of the literature on insects associated with I.


But, many studies were conducted that non- woody plants especially grasses have the potential to be materials in making paper. Then I assess the relative strength of above- and below-ground competition in cogongrass and sandhill relative to seedling recruitment of a woody and an herbaceous sandhill 89 90 species.


Error bars represent 1 standard deviation. A similarity matrix for 1 primer based on the number of shared RAPD bands among the 10 sites showed that no 2 sites had a similarity value higher than 0. Next I sought evidence of displacement of sandhill vegetation by measuring cover of different strata of sandhill vegetation in cogongrass of various coverages, and by examining frequency of large trees in dense cogongrass.

Pennisetum polystachion giant tussock grass bums more intensely than indigenous Sorghum intrans in forests of wet tropical Australia Macdonald and Framewhile in arid regions of the continent Cenchrus ciliaris bur grass carries fires along watercourses that previously acted as fire barriers Gill et al.

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

Head fires move rapidly, burn less fuel, and release less heat yrass a shorter time than backing fires. These spanned the range of published values for grassland and savanna fire temperatures DaubenmireFrost and Robertson Fire type, the first parameter of fire regime, describes either surface or crown fires, and backing fires spreading into the prevailing wind or head fires spreading with the prevailing wind.

Different letters indicate significant differences in pairwise comparisons Dunn’s method, P 35 ,Model I sterile circle I removed dead leaves, leaf litter, pine needles and twigs, dried the samples to constant weight at 60 C, then ground them through a 1 mm sieve.

In both sandhill and cogongrass, the bulk of fine fuel is below 0. This information could then be used to direct survey efforts to areas most likely to have the widest range of natural enemies Evans, If these lethal temperatures persist for more than the few dogon of a passing flame front, even thick-barked trees could be killed.