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The tension between pyrophytic hummock grasslands and fire-sensitive mulga shrubland is a major ecological theme in central Australia. On a sandplain on the edge of the Tanami Desert, grassland and shrubland are juxtaposed with abrupt boundaries that cut across a subtle environmental gradient. We compare woody plant diversity among vegetation types and explore correlates of the distribution of woody plant species. Alpha diversity in grassland and shrubland was almost identical, but plot-level species richness was greater in grassland. Gamma (landscape) diversity was scarcely greater than alpha diversity. Few long-lived plants, and not even the dominant hummock grass and shrub, were exclusively associated with one vegetation type, but most common species were aligned with elements – soil texture, fire frequency and the extent of physical soil crusting – that characterise the environmental gradient between vegetation types. Most species were resprouters and there was no tendency for obligate seeders or facultative resprouters to be associated with the less fire-prone shrubland. Our data are consistent with the suggestion that hummock grasslands and mulga shrubland are alternative stable states maintained by fire-soil feedback loops and possibly also by competitive exclusion of pyrophytic species by Acacia aneura.

Item Type:	Refereed Article
Keywords:	Acacia aneura; ASS; Ecotone; Interspecific competition; Spinifex; Woody plants
Research Division:	Biological Sciences
Research Group:	Ecology
Research Field:	Terrestrial Ecology
Objective Division:	Environment
Objective Group:	Flora, Fauna and Biodiversity
Objective Field:	Sparseland, Permanent Grassland and Arid Zone Flora, Fauna and Biodiversity
Author:	Bowman, DMJS (Professor David Bowman)
ID Code:	76662
Year Published:	2011
Web of Science® Times Cited:	12
Deposited By:	Plant Science
Deposited On:	2012-03-09
Last Modified:	2017-11-01
Downloads:	2 View Download Statistics