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Ageing mallee eucalypt vegetation after fire : insights for successional trajectories in semi-arid mallee ecosystems

Clarke, Michael F., Avitabile, Sarah C., Brown, Lauren, Callister, Kate E., Haslem, Angie, Holland, Greg J, Kelly, Luke T., Kenny, Sally A., Nimmo, Dale G., Spence-Bailey, Lisa M., Taylor, Rick S., Watson, Simon J. and Bennett, Andrew F. 2010, Ageing mallee eucalypt vegetation after fire : insights for successional trajectories in semi-arid mallee ecosystems, Australian journal of botany, vol. 58, no. 5, pp. 363-372, doi: 10.1071/BT10051.

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Title Ageing mallee eucalypt vegetation after fire : insights for successional trajectories in semi-arid mallee ecosystems
Author(s) Clarke, Michael F.
Avitabile, Sarah C.
Brown, Lauren
Callister, Kate E.
Haslem, Angie
Holland, Greg J
Kelly, Luke T.
Kenny, Sally A.
Nimmo, Dale G.
Spence-Bailey, Lisa M.
Taylor, Rick S.
Watson, Simon J.
Bennett, Andrew F.
Journal name Australian journal of botany
Volume number 58
Issue number 5
Start page 363
End page 372
Total pages 10
Publisher CSIRO Publishing
Place of publication Melbourne, Vic.
Publication date 2010-07-21
ISSN 0067-1924
Summary A critical requirement in the ecological management of fire is knowledge of the age-class distribution of the vegetation. Such knowledge is important because it underpins the distribution of ecological features important to plants and animals including retreat sites, food sources and foraging microhabitats. However, in many regions, knowledge of the age-class distribution of vegetation is severely constrained by the limited data available on fire history. Much fire-history mapping is restricted to post-1972 fires, following satellite imagery becoming widely available. To investigate fire history in the semi-arid Murray Mallee region in southern Australia, we developed regression models for six species of mallee eucalypt (Eucalyptus oleosa F.Muell. ex. Miq. subsp. oleosa, E. leptophylla F.Muell. ex. Miq., E. dumosa J. Oxley, E. costata subsp. murrayana L. A. S. Johnson & K. D. Hill, E. gracilis F.Muell. and E. socialis F.Muell. ex. Miq.) to quantify the relationship between mean stem diameter and stem age (indicated by fire-year) at sites of known time since fire. We then used these models to predict mean stem age, and thus infer fire-year, for sites where the time since fire was not known. Validation of the models with independent data revealed a highly significant correlation between the actual and predicted time since fire (r = 0.71, P < 0.001, n = 88), confirming the utility of this method for ageing stands of mallee eucalypt vegetation. Validation data suggest the models provide a conservative estimate of the age of a site (i.e. they may under-estimate the minimum age of sites >35 years since fire). Nevertheless, this approach enables examination of post-fire chronosequences in semi-arid mallee ecosystems to be extended from 35 years post-fire to over 100 years. The predicted ages identified for mallee stands imply a need for redefining what is meant by ‘old-growth’ mallee, and challenges current perceptions of an over-abundance of ‘long-unburnt’ mallee vegetation. Given the strong influence of fire on semi-arid mallee vegetation, this approach offers the potential for a better understanding of long-term successional dynamics and the status of biota in an ecosystem that encompasses more than 250 000 km2 of southern Australia.
Language eng
DOI 10.1071/BT10051
Field of Research 050202 Conservation and Biodiversity
Socio Economic Objective 960811 Sparseland, Permanent Grassland and Arid Zone Flora, Fauna and Biodiversity
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2010
Copyright notice ©2010, CSIRO
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