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How do drought and fire influence the patterns of resprouting in Australian deserts?

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Abstract

Rainfall is the key driver of woody cover and life-history attributes in arid grassy biomes where disturbance is mostly rare and of low intensity. However, relatively little is known about the causes of woody community assembly in arid systems that are subject to periodic intense fire disturbance. In the central Australian desert region, grassland and shrubland fire can occur following above average rainfall. Patterns of species regeneration response (resprouting vs. reseeding) are poorly documented in this region. We tested the effects of rainfall and fire on species’ resprouting response across the latitudinal rainfall–fire gradient using constrained ordination of 385 sites and general linear models. A resprouting response was significantly greater in grassland habitat as well as at the high end of the rainfall–fire gradient. The frequency of epicormic stem resprouting also increased along the rainfall–fire gradient. We attribute this pattern to the combined effects of frequent fire and rapid gap closure on seedlings of slow-growing, fire-killed woody species in higher rainfall grasslands. In addition, we also demonstrated that rapidly maturing fire-recruiting species are similarly favoured by high fire disturbance. In arid grassy ecosystems, unlike in mesic savanna, flammable grassland supports a mix of resprouting and recruitment functional types, and habitat membership cannot be predicted by resprouting capacity. Regions, such as central Australia, that are characterised by grassland–shrubland mosaics of high and low fuel biomass, respectively, pose specific challenges to fire ecology research that are possibly best dealt with by focussing modelling at the habitat scale.

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Acknowledgments

We thank the Department of Natural Resources, Environment, Arts and Sport of the Northern Territory Government for providing site data and staff time. Thanks also to Chris Pavey and Dorothy Turner and the two anonymous referees who improved the manuscript and facilitated its publication. This work complies with the current laws of the Commonwealth of Australia.

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Authors and Affiliations

  1. Biodiversity Conservation Division, NT Department of Natural Resources, Environment, the Arts and Sport, Winnellie, Australia

    Catherine E. M. Nano & Peter J. Clarke

  2. Botany, School of Environmental and Rural Sciences, University of New England, Armidale, 2351, Australia

    Peter J. Clarke

Authors
  1. Catherine E. M. Nano
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  2. Peter J. Clarke
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Correspondence to Peter J. Clarke.

Appendix

Appendix

See Table 4.

Table 4 Categorisation of 225 woody species recorded in 385 sample plots of Triodia grassland or Acacia shrubland habitats in central Australia
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Nano, C.E.M., Clarke, P.J. How do drought and fire influence the patterns of resprouting in Australian deserts?. Plant Ecol 212, 2095–2110 (2011). https://doi.org/10.1007/s11258-011-9988-x

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