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Dynamics of plant populations in Heteropogon contortus (black speargrass) pastures on a granite landscape in southern Queensland. 3. Dynamics of Aristida spp. populations

Orr, D.M. and Paton, C.J. and Playford, C. (2004) Dynamics of plant populations in Heteropogon contortus (black speargrass) pastures on a granite landscape in southern Queensland. 3. Dynamics of Aristida spp. populations. Tropical Grasslands, 38 . pp. 65-76.

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Publisher URL: http://www.tropicalgrasslands.asn.au

Abstract

The dynamics of the unpalatable Aristida spp. (wiregrasses) were measured in a subset of treatments contained within an extensive grazing study conducted between 1990 and 1996 in H. contortus pasture in southern Queensland. This paper reports the results from these treatments which included 2 land classes (silver-leaved and narrowleaved ironbark), 3 stocking rates (0.3, 0.6 and 0.9 beasts/ha) in both native pasture and legumeoversown native pasture, all in the absence of fire.
Changes in plant density and basal area of Aristida spp. reflected differences in both the survival and size of existing plants together with a large seedling recruitment in 1991. Two different taxa of Aristida spp. were distinguished; however, there were no clear differences in the response of these 2 taxa to the treatments. Grazing had the greatest impact on population dynamics through reducing basal area as stocking rate increased. Neither landscape position nor legume oversowing had a major impact on Aristida spp.
The results suggest that populations of Aristida spp. will be highest under light grazing and that seedling recruitment may be episodic

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science
Business groups:Agri-Science, Crop and Food Science
Additional Information:© The Tropical Grassland Society of Australia Inc. Journal subscribers may be able to access the published version of this article. Use hypertext link above to access publisher’s web site.
Keywords:Dynamics; Heteropogon contortus; Black speargrass; Granite; Aristida spp.; Grazing.
Subjects:Animal culture > Rangelands. Range management. Grazing
Deposited On:14 Mar 2005
Last Modified:25 Oct 2011 23:17

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