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Floristic uniformity across abrupt boundaries between Triodia hummock grassland and Acacia shrubland on an Australian desert sandplain.

Nicholas, A. M. M., Franklin, Donald C. and Bowman, D. J. M. S. (2011). Floristic uniformity across abrupt boundaries between Triodia hummock grassland and Acacia shrubland on an Australian desert sandplain.. Journal of Arid Environments,75(11):1090-1096.

Document type: Journal Article

IRMA ID 82057923xPUB46
Title Floristic uniformity across abrupt boundaries between Triodia hummock grassland and Acacia shrubland on an Australian desert sandplain.
Author Nicholas, A. M. M.
Franklin, Donald C.
Bowman, D. J. M. S.
Journal Name Journal of Arid Environments
Publication Date 2011
Volume Number 75
Issue Number 11
ISSN 0140-1963   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-79960987011
Start Page 1090
End Page 1096
Total Pages 7
Place of Publication United Kingdom
Publisher Academic Press
HERDC Category C1 - Journal Article (DIISR)
Abstract 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.
Keywords Acacia aneura
ASS
Ecotone
Interspecific competition
Spinifex
Woody plants
DOI http://dx.doi.org/10.1016/j.jaridenv.2011.06.016   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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