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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Multi-decadal increases in shrub abundance in non-riverine red gum (Eucalyptus camaldulensis) woodlands occur during a period of complex land-use history

Jodi N. Price A B C and John W. Morgan A
+ Author Affiliations
- Author Affiliations

A Department of Botany, La Trobe University, Bundoora, Vic. 3086, Australia.

B Present address: Ecosystem Management, University of New England, Armidale, NSW 2351, Australia.

C Corresponding author. Email: jprice20@une.edu.au

Australian Journal of Botany 57(3) 163-170 https://doi.org/10.1071/BT07079
Submitted: 26 April 2007  Accepted: 31 March 2009   Published: 29 June 2009

Abstract

The history of land-use was examined in Eucalyptus camaldulensis Dehnh. woodland in the Victoria Valley of the Grampians National Park, south-eastern Australia, to help interpret changes in vegetation there during the last 50 years. We used aerial photography and dendrochronological data to quantify the amount of, and the rate of change in, the woody-vegetation cover between 1948 and 1997, and historical data to document land-use changes during this time. Aerial photographs indicated that in 1948, 56% of study area had <50% cover of woody plants. By 1997, 90% of the study area had >50% woody-plant cover. The native shrub Leptospermum scoparium J.R. Forst & G. Forst (Myrtaceae) was predominantly responsible for the increases in cover. Demographic analyses indicated that recruitment has been ongoing rather than episodic; large numbers of shrubs, however, have recruited since 1994. We hypothesise that the vegetation changes observed are likely a response to changes in land-use that have occurred since European occupation. Increased woody-plant cover followed the removal of sheep grazing in the long-term absence of fire. It is very likely that the long history of stock grazing, coupled with selective logging and associated soil disturbance, initiated a change in understorey vegetation by reducing competitive native tussock grasses and fuel loads to carry fires and this reduction was initially responsible for the encroachment of shrubs into the woodland. Recruitment has been ongoing in the absence of any recent land-use changes (most utilisation ceasing after the declaration of National Park status in 1984) and hence, this transformation from species-rich herbaceous woodland to shrubby woodland is expected to continue in the future.


Acknowledgements

Logistical and financial support for this research was provided by the Department of Botany, La Trobe University. Marty Gent assisted with aerial photograph analysis and Ian Lunt provided us with valuable insights into the wattle-bark industry. The manuscript was greatly improved by helpful comments from Wal Whalley, Bob Parsons and four anonymous reviewers.


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