The Rangeland Journal The Rangeland Journal Society
Rangeland ecology and management
RESEARCH ARTICLE

Ecological impacts of buffel grass (Cenchrus ciliaris L.) invasion in central Australia – does field evidence support a fire-invasion feedback?

Georgia Miller A C , Margaret Friedel B D , Paul Adam C and Vanessa Chewings B

A Current address: 46 Helen St, Northcote, Vic. 3070, Australia.

B CSIRO Sustainable Ecosystems, PO Box 2111, Alice Springs, NT 0871, Australia.

C University of New South Wales, Kensington, NSW 2052, Australia.

D Corresponding author. Email: margaret.friedel@csiro.au

The Rangeland Journal 32(4) 353-365 http://dx.doi.org/10.1071/RJ09076
Submitted: 18 November 2009  Accepted: 30 June 2010   Published: 26 November 2010

Abstract

Buffel grass (Cenchrus ciliaris L.) has invaded extensive areas of arid and semi-arid Australia following its introduction as a pasture species and for erosion control. It has been suggested that buffel grass has initiated a positive fire-invasion feedback in central Australia, disrupting existing fire regimes, encouraging further buffel grass invasion, and disadvantaging the native woody flora in particular, but this hypothesis has not been tested quantitatively.

This study investigated recently burnt woodland areas near Alice Springs for evidence of a fire-invasion feedback, including the impact of changing fire behaviour (intensity) on the native woodland overstorey flora. Despite the limitations inherent in a short study of ecological processes in a highly heterogeneous environment, substantial field evidence was found to support the existence of a buffel grass-initiated fire-invasion feedback.

Buffel grass invasion was significantly correlated with increased fuel loads. Increased fuel loads were significantly correlated with increased burn severity, although the direct relationship between the proportion of buffel grass and increased burn severity was marginally non-significant. High field variance resulted in inadequate power to test whether or not the relative abundance of buffel grass had increased in the post-fire community. Burn severity was significantly correlated with the mortality of woodland overstorey species, and with the proportion of fire survivors that were reduced to basal resprouts. Seedling density of canopy species was low. It appears likely that future recruitment of canopy species will be hindered by the dense post-fire reestablishment of buffel grass cover at some sites. The overstorey flora is thus likely to be adversely affected by increased severity of fire associated with buffel grass invasion. As a result, there may be major change in the structure and composition of some woodlands.

Additional keywords: fuel load, burn severity, tree and shrub mortality, run-on/run-off.


References

Adair R. J. , and Groves R. H. (1998). ‘Impact of Environmental Weeds on Biodiversity: A Review and Development of a Methodology.’ (Biodiversity Group, Environment Australia: Canberra.)

Albrecht D. Pitts B. 1997 Buffel grass on Parks and Wildlife Commission reserves. Alice Springs Rural Review 27 7

Albrecht D. E. , Duguid A. W. , and Coulson H. (1999). ‘Vascular Plant Checklist for the Southern Bioregions of the Northern Territory: Update Bulletin No. 1.’ (Parks and Wildlife Commission of the Northern Territory: Alice Springs.)

Albrecht D. E. , Duguid A. W. , Latz P. K. , Coulson H. , and Barritt M. J. (1997). ‘Vascular Plant Checklist for the Southern Bioregions of the Northern Territory: Nomenclature, Distribution and Conservation Status.’ (Parks and Wildlife Commission of the Northern Territory: Alice Springs.)

Allan C. 1997 A brief history of buffel grass in central Australia. Alice Springs Rural Review 27 2


Anable M. E. McClaran M. P. Ruyle G. B. 1992 Spread of introduced Lehmann lovegrass Eragrostis lehmanniana Nees. in Southern Arizona, USA. Biological Conservation 61 181 188
doi:10.1016/0006-3207(92)91114-8

Bennett L. T. Judd T. S. Adams M. A. 2002 Growth and nutrient content of perennial grasslands following burning in semi-arid, sub-tropical Australia. Plant Ecology 164 185 199 doi:10.1023/A:1021253600712

Best R. A. (1998). The effect of introduced buffel grass (Cenchrus ciliaris L., Poaceae) on the diversity and abundance of invertebrates in semi-arid central Australia. Grad. Dip. Thesis, Faculty of Science, Northern Territory University, Darwin, Australia.

Bureau of Meteorology (2002). Alice Springs Long-term Climate Data. Available at: www.bom.gov.au (accessed 17 October 2002).

Butler D. W. Fairfax R. J. 2003 Buffel grass and fire in a gidgee and brigalow woodland; a case study from central Queensland. Ecological Management & Restoration 4 120 125 doi:10.1046/j.1442-8903.2003.00146.x

Chambers D. P. Attiwill P. M. 1994 The ash-bed effect in Eucalyptus regnans forest: chemical, physical and microbiological changes in soil after heating or partial sterilisation. Australian Journal of Botany 42 739 749 doi:10.1071/BT9940739

Cheam A. H. 1984 a Allelopathy in buffel grass (Cenchrus ciliaris L.) Part I. Influence of buffel grass association on calotrope (Calotropis procera (Ait.) W.T. Ait.). Australian Weeds 3 133 136

Cheam A. H. 1984 b Allelopathy in buffel grass (Cenchrus ciliaris L.) Part II. Site of release and distribution of allelochemical in the soil profile. Australian Weeds 3 137 139


Christie E. K. 1975 A note on the significance of Eucalyptus populnea for buffel grass production in infertile semi-arid rangelands. Tropical Grasslands 9 243 246


Christie E. K. Moorby J. 1975 Physiological responses of semiarid grasses. I. The influence of phosphorus supply on growth and phosphorus absorption. Australian Journal of Agricultural Research 26 423 436
doi:10.1071/AR9750423

Clarke K. R. , and Gorley R. N. (2001). ‘Getting Started with Primer v5: User Manual/Tutorial.’ (Primer-E Ltd., Plymouth: UK.)

Clarke P. J. Latz P. K. Albrecht D. E. 2005 Long-term changes in semi-arid vegetation: Invasion of an exotic perennial grass has larger effects than rainfall variability. Journal of Vegetation Science 16 237 248 doi:10.1111/j.1654-1103.2005.tb02361.x

Cox J. R. Ruyle G. B. Roundy B. A. 1990 Lehmann lovegrass in southeastern Arizona: Biomass production and disappearance. Journal of Range Management 43 367 372 doi:10.2307/3898933

CSIRO (2007). Climate change in Australia. Technical Report, CSIRO Australia. Available at: www.climatechangeinaustralia.gov.au (accessed 14 May 2010).

Daehler C. C. Carino D. A. 1998 Recent replacement of native pili grass (Heteropogon contortus) by invasive African grasses in the Hawaiian Islands. Pacific Science 52 220 227

D’Antonio C. Vitousek P. M. 1992 Biological invasions by exotic grasses, the grass/fire cycle, and global change. Annual Review of Ecology and Systematics 23 63 87


D’Antonio C. M. Tunison J. T. Loh R. K. 2000 Variation in the impact of exotic grasses on native plant composition in relation to fire across an elevation gradient in Hawaii. Austral Ecology 25 507 522


Daubenmire R. 1968 Ecology of fire in grasslands. Advances in Ecological Research 5 209 266
doi:10.1016/S0065-2504(08)60226-3

Eliason S. A. Allen E. B. 1997 Exotic grass competition in suppressing native shrub re-establishment. Restoration Ecology 5 245 255 doi:10.1046/j.1526-100X.1997.09729.x

Eyre T. J. Wang J. Venz M. F. Chilcott C. Whish G. 2009 Buffel grass in Queensland’s semi-arid woodlands: response to local and landscape scale variables, and relationship with grass, forb and reptile species. The Rangeland Journal 31 293 305 doi:10.1071/RJ08035

Fairfax R. J. Fensham R. J. 2000 The effect of exotic pasture development on floristic diversity in central Queensland, Australia. Biological Conservation 94 11 21 doi:10.1016/S0006-3207(99)00169-X

Franks A. J. 2002 The ecological consequences of buffel grass Cenchrus ciliaris establishment within remnant vegetation of Queensland. Pacific Conservation Biology 8 99 107

Friedel M. , Bastin G. , Brock C. , Butler D. , Clarke A. , Eyre T. , Fox F. , Grice T. , van Leeuwen S. , Pitt J. , Puckey H. , and Smyth A. (2007). ‘Developing a Research Agenda for the Distribution and Rate of Spread of Buffel Grass (Cenchrus ciliaris) and Identification of Landscapes and Biodiversity Assets at Most Risk from Invasion.’ (Australian Government Department of the Environment and Water Resources: Canberra.)

Friedel M. , Puckey H. , O’Malley C. , Waycott M. , Smyth A. , and Miller G. (2006). ‘Buffel Grass: Both Friend and Foe. An Evaluation of the Advantages and Disadvantages of Buffel Grass Use and Recommendations for Future Research.’ (Desert Knowledge Cooperative Research Centre: Alice Springs.)

Friedel M. H. 1981 Studies of central Australian semidesert rangelands. I. Range condition and the biomass dynamics of the herbage layer and litter. Australian Journal of Botany 29 219 231
doi:10.1071/BT9810219

Fulbright N. Fulbright T. E. 1990 Germination of 2 legumes in leachate from introduced grasses. Journal of Range Management 43 466 467 doi:10.2307/3899014

Green S. B. , Salkind N. J. , and Akey T. M. (2000). ‘Using SPSS for Windows: Analysing and Understanding Data.’ (Prentice Hall Inc.: New Jersey.)

Griffin G. F. (1993). The spread of buffel grass in inland Australia: land use conflicts. In: ‘Proceedings I: 10th Australian Weeds Conference and 14th Asian Pacific Weed Science Society Conference’. pp. 501–504. (The Weed Society of Queensland on behalf of the Council of Australian Weed Societies and the Asian-Pacific Weed Science Society: Brisbane.)

Griffin G. F. Friedel M. H. 1984 Effects of fire on central Australian rangelands. II. Changes in tree and shrub populations. Australian Journal of Ecology 9 395 403 doi:10.1111/j.1442-9993.1984.tb01376.x

Griffin G. F. Price N. F. Portlock H. F. 1983 Wildfires in the Central Australian Rangelands, 1970–1980. Journal of Environmental Management 17 311 323

Harrington G. N. 1991 Effects of soil moisture on shrub seedling survival in a semi-arid grassland. Ecology 72 1138 1149
doi:10.2307/1940611

Hodgkinson K. C. , and Griffin G. F. (1982). Adaptation of shrub species to fires in the arid zone. In: ‘The Evolution of the Flora and Fauna of Arid Australia’. (Eds W. R. Barker and P. J. M. Greenslade.) pp. 145–152. (Peacock Publications: Frewville.)

Hughes F. Vitousek P. M. 1993 Barriers to shrub reestablishment following fire in the seasonal submontane zone of Hawaii. Oecologia 93 557 563 doi:10.1007/BF00328965

Hughes F. Vitousek P. M. Tunison T. 1991 Alien grass invasion and fire in the seasonal submontane zone of Hawaii. Ecology 72 743 746 doi:10.2307/2937215

Humphreys L. R. 1967 Buffel grass (Cenchrus ciliaris) in Australia. Tropical Grasslands 1 123 134

Humphries S. E. (1993). Environmental impact of weeds. In: ‘Proceedings II: 10th Australian Weeds Conference and 14th Asian Pacific Weed Science Society Conference. Plenary Papers’. pp. 1–12. (The Weed Society of Queensland on behalf of The Council of Australian Weed Societies and the Asian-Pacific Weed Science Society: Brisbane.)

Humphries S. E. Groves R. H. Mitchell D. S. 1991 Plant invasions of Australian ecosystems: A status review and management directions. Kowari 2 1 134


Hussain F. Naqvi H. H. Ilahi I. 1982 Interference exhibited by Cenchrus ciliaris L. and Bothriochloa pertusa (L.) A. Camus. Bulletin of the Torrey Botanical Club 109 513 523
doi:10.2307/2996492

Jones R. M. Hargreaves J. N. 1979 Improvements to the dry-weight-rank method for measuring botanical composition. Grass and Forage Science 34 181 189 doi:10.1111/j.1365-2494.1979.tb01465.x

Knapp P. A. 1996 Cheatgrass (Bromus tectorum L.) dominance in the Great Basin Desert: History, persistence, and influences to human activities. Global Environmental Change 6 37 52 doi:10.1016/0959-3780(95)00112-3

Latz P. (1991). Buffel and couch grass in central Australian creeks and rivers. Newsletter of the Central Australian Conservation Council Inc. April, 5. Central Australian Conservation Council syn. Arid Lands Environment Centre, Alice Springs.

Lonsdale W. M. 1994 Inviting trouble: introduced pasture species in northern Australia. Australian Journal of Ecology 19 345 354 doi:10.1111/j.1442-9993.1994.tb00498.x

Low T. 1997 Tropical pasture plants as weeds. Tropical Grasslands 31 337 343

Mack M. D’Antonio C. M. 1998 Impacts of biological invasions on disturbance regimes. Trends in Ecology & Evolution 13 195 198
doi:10.1016/S0169-5347(97)01286-X

Moreno J. M. Oechel W. C. 1991 Fire intensity effects of germination of shrubs and herbs in southern California chaparral. Ecology 72 1993 2004 doi:10.2307/1941554

Morrison D. A. Renwick J. A. 2000 Effects of variation in fire intensity on regeneration of co-occurring species of small trees in the Sydney region. Australian Journal of Botany 48 71 79 doi:10.1071/BT98054

Noble J. C. , and Grice A. C. (2002). Fire regimes in semi-arid and tropical pastoral lands: managing biological diversity and ecosystem function. In: ‘Flammable Australia: The Fire Regimes and Biodiversity of a Continent’. (Eds R. A. Bradstock, J. E. Williams and M. A. Gill.) pp. 373–400. (Cambridge University Press: Cambridge.)

Parker I. M. Simberloff D. Lonsdale W. M. Goodell K. Wonham M. Kareiva P. M. Williamson M. H. Von Holle B. Moyle P. B. Byers J. E. Goldwasser L. 1999 Impact: towards a framework for understanding the ecological impacts of invaders. Biological Invasions 1 3 19 doi:10.1023/A:1010034312781

Pickup G. 1985 The erosion cell – a geomorphic approach to landscape classification in range assessment. Australian Rangeland Journal 7 114 121 doi:10.1071/RJ9850114

Pitts B. Albrecht D. 2000 Buffel grass (Cenchrus ciliaris) control in Central Australia. Danthonia 9 7 8

Pollet J. Omi P. 2002 Effect of thinning and prescribed burning on crown fire severity in ponderosa pine forests. International Journal of Wildland Fire 11 1 10
doi:10.1071/WF01045

Quinn G. P. , and Keough M. J. (2002). ‘Experimental Design and Data Analysis for Biologists.’ (Cambridge University Press: Cambridge.)

Rossiter N. A. Setterfield S. A. Douglas M. M. Hutley L. B. 2003 Testing the grass-fire cycle: alien grass invasion in the tropical savannas of northern Australia. Diversity & Distributions 9 169 176 doi:10.1046/j.1472-4642.2003.00020.x

Rossiter-Rachor N. A. Setterfield S. A. Douglas M. M. Hutley L. B. Cook G. D. 2008 Andropogon gayanus (gamba grass) invasion increases fire-mediated nitrogen losses in the tropical savannas of northern Australia. Ecosystems 11 77 88 doi:10.1007/s10021-007-9108-x

Schultz A. M. Launchbaugh J. L. Biswell H. H. 1955 Relationship between grass density and seedling survival. Ecology 36 226 238 doi:10.2307/1933228

Siegel S. , and Castellan N. J. J. (1988). ‘Non-parametric Statistics for the Behavioural Sciences.’ (McGraw-Hill Book Company: New York.)

Smyth A. Friedel M. O’Malley C. 2009 The influence of buffel grass (Cenchrus ciliaris) on biodiversity in an arid Australian landscape. The Rangeland Journal 31 307 320 doi:10.1071/RJ08026

Stafford Smith D. M. Morton S. R. 1990 Review: a framework for the ecology of arid Australia. Journal of Arid Environments 18 255 278

Tongway D. , and Hindley N. (1995). ‘Manual for Assessment of Soil Condition of Tropical Grasslands.’ (CSIRO Australia, Division of Wildlife and Ecology: Canberra.)

Tothill J. C. , Hargreaves J. N. G. , Jones R. M. , and McDonald C. K. (1992). ‘BOTANAL – A Comprehensive Sampling and Computing Procedure for Estimating Pasture Yield and Composition. 1. Field Sampling.’ Tropical Agronomy Technical Memorandum No. 78. (CSIRO: St Lucia.)

Vilà M. Lloret F. Ogheri E. Terradas J. 2001 Positive fire-grass feedback in Mediterranean Basin woodlands. Forest Ecology and Management 147 3 14
doi:10.1016/S0378-1127(00)00435-7

Vitousek P. M. Walker L. R. 1989 Biological invasion by Myrica faya in Hawai’i: Plant demography, nitrogen fixation ecosystem effects. Ecological Monographs 59 247 265 doi:10.2307/1942601

Waldrop T. A. Brose P. H. 1999 A comparison of fire intensity levels for stand replacement of table mountain pine (Pinus pungens Lamb.). Forest Ecology and Management 113 155 166 doi:10.1016/S0378-1127(98)00422-8

Walker J. Condon R. W. Hodgkinson K. C. Harrington G. N. 1981 Fire in pastoral areas of Poplar Box (Eucalyptus populnea) lands. Australian Rangeland Journal 3 12 23 doi:10.1071/RJ9810012

Whyte R. O. , Moir T. R. G. , and Cooper J. P. (1959). ‘Grasses in Agriculture.’ FAO Agricultural Study No. 42. (FAO: Rome.)

Wilkie A. (1997). ‘A Manual for the Production of Photographic Standards for Use in Herbage Yield and Cover Estimates.’ Technical Bulletin No. 264. (Department of Primary Industry and Fisheries: Alice Springs.)

Williams D. G. Baruch Z. 2000 African grass invasion in the Americas: ecosystem consequences and the role of ecophysiology. Biological Invasions 2 123 140 doi:10.1023/A:1010040524588

Wilson A. D. Mulham W. E. 1979 A survey of the regeneration of some problem shrubs and trees after wildfire in western New South Wales. Australian Rangeland Journal 1 363 368 doi:10.1071/RJ9790363

Wright B. A. Clarke P. J. 2007 Resprouting responses of Acacia shrubs in the Western Desert of Australia – fire severity, interval and season influence survival. International Journal of Wildland Fire 16 317 323 doi:10.1071/WF06094

Zar J. H. (1996). ‘Biostatistical Analysis.’ (Prentice-Hall Inc.: Upper Saddle River.)



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