Effects of fire and drought in a tropical eucalypt savanna colonized by rain forest

Fensham, R. J., Fairfax, R. J., Butler, D. W. and Bowman, D. M. J. S. (2003) Effects of fire and drought in a tropical eucalypt savanna colonized by rain forest. Journal of Biogeography, 30 9: 1405-1414. doi:10.1046/j.1365-2699.2003.00934.x

Author Fensham, R. J.
Fairfax, R. J.
Butler, D. W.
Bowman, D. M. J. S.
Title Effects of fire and drought in a tropical eucalypt savanna colonized by rain forest
Journal name Journal of Biogeography   Check publisher's open access policy
ISSN 0305-0270
Publication date 2003-09
Year available 2003
Sub-type Article (original research)
DOI 10.1046/j.1365-2699.2003.00934.x
Volume 30
Issue 9
Start page 1405
End page 1414
Total pages 10
Place of publication England
Publisher Blackwell Scientific Publications
Language eng
Subject 060208 Terrestrial Ecology
Formatted abstract
This study documents the effects of multiple fires and drought on the woody structure of a north Australian savanna never grazed by domestic stock.

The study was conducted in a 500 ha pocket of Eucalyptus-dominated savanna surrounded by a late Quaternary lava flow. The flow is known as the Great Basalt Wall, located c. 50 km northeast of Charters Towers in semi-arid north-eastern Australia. This region was exposed to the largest 5-year rainfall deficit on record between 1992 and 1996.

All individual woody plants were tagged within a 1.56 ha plot. Species were segregated into their habitat affinities (rain forest, ecotone, savanna) and regeneration strategy (resprouter, seeder). The survivorship of plants within these categories was analysed in relation to fire intensity from the first fire, and to each of four fires lit between 1996 and 2001.

Before the first fire, the plot contained thirty-one tree species including twenty-one typical of the surrounding dry rain forest. These rain forest species were represented by small individuals and constituted <1% of the total basal area of woody plants. The basal area of savanna trees was 7.5 m2 ha−1 at the commencement of monitoring, although 31% had recently died and others had major crown damage. Further death of the drought debilitated savanna trees was substantial during the first year of monitoring and the basal area of live savanna trees declined to 1.1 m2 ha−1 after 5 years. Most species from both rain forest and savanna were classified as resprouters and are capable of regenerating from underground organs after fire. Species without this ability (rain forest seeders and ecotone seeders) were mostly eliminated after the first two consecutive fires. Among resprouters, survivorship declined as fire intensity increased and this was more pronounced for rain forest than for savanna species. Repeated burning produced a cumulative effect of decreasing survivorship for rain forest resprouters relative to savanna resprouters.

Main conclusions
The study provides evidence that savanna and rain forest trees differ in fire susceptibility and that recurrent fire can explain the restricted distribution of rain forest in the seasonally arid Australian tropics. The time of death of the savanna trees is consistent with the regional pattern after severe drought, and highlights the importance of medium term climate cycles for the population dynamics of savanna tree species and structure of Australian savannas.

Keyword Australia
dry rain forest
eucalypt savanna
References # Adam, P. & Williams, G. (2001) Dioecy, self-compatibility and vegetative reproduction in Australian sub-tropical rainforest trees and shrubs. Cunninghamia 7, 89–100. Links # Allingham, A. (1988) Taming the wilderness. Studies in north Queensland history no. 1. Department of History, James Cook University, Townsville. # Bowman, D.M.J.S. (1991) Recovery of some northern Australian monsoon forest tree species following fire. Proceedings of the Royal Society of Queensland 101, 21–25. Links # Bowman, D.M.J.S. (2000) Australian rainforests: islands of green in a land of fire. Cambridge University Press, Cambridge. # Bowman, D.M.J.S. (2002) The Australian summer monsoon: a biogeographic perspective. Australian Geographical Studies 40, 261–277. Links # Bowman, D.M.J.S. & Panton, W.J. (1993) Differences in the stand structure of Eucalyptus tetrodonta forests between Elcho Island and Gunn Point, northern Australia. Australian Journal of Botany 43, 211–215. Links # Bowman, D.M.J.S., Wilson, B.A. & Fensham, R.J. (1999) Relative drought tolerance of evergreen-rainforest and evergreen-savanna species in a long unburnt Eucalyptus savanna, north Queensland, Australia. Proceedings of the Royal Society of Queensland 108, 27–31. Links # Bryam, G.M. (1959) Combustion of forest fuels. Forest fire control and use (ed. by K.P. Davis), p. 61–89. McGraw Hill, New York. # Cheney, N.P. & Gould, J.S., (1993) The influence of fuel, weather and fire shape variables on fire-spread in grasslands. International Journal of Wildland Fire 3, 31–44. Links # Fensham, R.J. (1992) The establishment of eucalypt seedlings in tropical savanna forest. Northern Territory Naturalist 13, 30–36. Links # Fensham, R.J. (1995) Floristics and environmental relations of inland dry rainforest in north Queensland, Australia. Journal of Biogeography 22, 1047–1063. Links # Fensham, R.J. (1996) The floristics and structure of dry rainforest at Forty Mile Scrub National Park, north Queensland. Cunninghamia 4, 483–495. Links # Fensham, R.J. (1997) Aboriginal fire regimes in Queensland, Australia: analysis of the explorers' record. Journal of Biogeography 24, 11–22. Links # Fensham, R.J. (1998) The influence of cattle grazing on tree mortality after drought in savanna woodland in north Queensland. Australian Journal of Ecology 23, 405–407. Links # Fensham, R.J. & Butler, D.W. (in press) The spatial pattern of dry rainforest colonising unburnt Eucalyptus savanna. Austral Ecology. # Fensham, R.J. & Holman, J.E. (1999) Temporal and spatial patterns in drought-related tree dieback in Australian savanna. Journal of Applied Ecology 36, 1035–1050. Links # Fensham, R.J. & Skull, S. (1999) Before cattle: a comparative floristic study of grassy Eucalyptus woodland grazed by macropods and cattle in north Queensland, Australia. Biotropica 31, 37–47. Links # Flecker, P.O. (1951) Remains of aboriginal habitation on the Great Barrier Wall. North Queensland Naturalist 19, 1–3. Links # Henderson, R.J.F. (ed.) (2002) Names and distribution of Queensland plants, algae and lichens. Environmental Protection Agency, Brisbane. # Hodgkinson, K.C. (1991) Shrub recruitment response to intensity and season of fire in a semi-arid woodland. Journal of Applied Ecology 28, 60–70. Links # Hodgkinson, K.C. (1998) Sprouting success of shrubs after fire: height-dependent relationships for different strategies. Oecologia 115, 64–72. Links # Jeltsch, F., Weber, G.E. & Grimm, V. (2000) Ecological buffering mechanisms in savannas: a unifying theory of long-term tree-grass coexistence. Plant Ecology 161, 161–171. Links # Johnson, A. (2002) North Australian grassland fuel guide. Bushfires Council NT, Darwin. # McArthur, A.G. (1966) Weather and grassland fire behaviour. Commonwealth of Australia Forestry and Timber Bureau Leaflet 100, 23pp. # MacGregor, S.D. & O'Connor, T.G. (2002) Patch dieback of Colophospermum mopane in a dysfunctional semi-arid African savanna. Austral Ecology 27, 385–395. Links # Pillans, B. (1997) Soil development at snail's pace evidence from a chronosequence on basalt in north Queensland, Australia. Geoderma 80, 117–128. Links # Russell-Smith, J. (1996) Regeneration of monsoon rainforest in northern Australia: the sapling bank. Journal of Vegetation Science 2, 259–278. Links # Russell-Smith, J. & Stanton P. (2002) Fire regimes and fire management of rainforest communities across northern Australia. Flammable Australia: the fire regimes and biodiversity of a continent (ed. by R.J. Bradstock, J. Williams and A.M. Gill), pp. 329–350. Cambridge University Press, Cambridge. # Russell-Smith, J., Ryan, P.G., Klessa, D., Waight, G. & Harwood, R. (1998) Fire regimes, fire-sensitive vegetation, and fire management of the sandstone Arnhem Plateau, monsoonal northern Australia. Journal of Applied Ecology 36, 829–846. Links # Sullivan, A.L., Knight, I.K. & Cheney, N.P., (2001) Predicting the radiant heat flux from burning logs in a forest following a fire. Australian Forestry 65, 9–67. Links # Thomson, D.F. (1939) The seasonal factor in human culture illustrated from the life of a contemporary nomadic group. Proceedings of Prehistoric Society 5, 209–221. Links # Webb, L.J. (1968) Environmental relationships of the structural types of Australian rainforest. Ecology 49, 296–311. Links # Webb, L.J. & Tracey, J.G. (1981) Australian rainforests: patterns and change. Ecological biogeography of Australia (ed. by A. Keast), pp. 605–694. Dr W. Junk, The Hague. Links # Williams, P.R. (2000) Fire-stimulated rainforest seedling recruitment and vegetative regeneration in a densely grassed wet sclerophyll forest of north-eastern Australia. Australian Journal of Botany 48, 651–658. Links # Williams, R.J., Gill, A.M. & Moore, P.H.R. (1998) Seasonal changes in fire behaviour in a tropical savanna in northern Australia. International Journal of Wildland Fire 8, 227–239. Links
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