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

Germination response to heat and smoke of 22 Poaceae species from grassy woodlands

S. Clarke A B and K. French A

A Institute for Conservation Biology, School of Biological Sciences, University of Wollongong, Wollongong, NSW 2522, Australia.

B Corresponding author. Email: sclarke@bgpa.wa.gov.au

Australian Journal of Botany 53(5) 445-454 http://dx.doi.org/10.1071/BT04017
Submitted: 6 February 2004  Accepted: 4 April 2005   Published: 11 August 2005

Abstract

Grasses form an important component of grassy woodlands, although their response to fire has been understudied. In this study, fire germination responses of 22 Poaceae species from an endangered grassy-woodland community in eastern Australia were investigated. Seeds of 20 native and two exotic species were subjected to heat (no heat, 40, 80 and 120°C) and smoke treatment (10% dilution smoke water) and the percentage germination was compared. Germination response of species showed no consistent pattern to phylogeny and was highly variable. Germination in six species was unaffected by the application of heat or smoke. In five species, heat, irrespective of smoke application, influenced germination. Smoke, irrespective of heat treatment, influenced six species. For a further six species, the effect of smoke varied with temperature. These results suggest that fire regimes will influence the recruitment of grass species differentially and maintaining regional species richness is likely to require the maintenance of a heterogeneous fire regime across the landscape.


References

Auld TD O’Connell MA 1991 Predicting patterns of post-fire germination in 35 eastern Australia Fabaceae. Australian Journal of Ecology 16 53 70

Baskin CC Baskin JM 1998 VI. Tropical dry woodlands, natural savannas, and grasslands. In ‘Seeds: ecology, biogeography, and evolution of dormancy and germination’. Baskin CC Baskin JM 281 293 Academic Press San Diego, CA

Baxter BJM Granger JE van Staden J 1995 Plant-derived smoke and seed germination: is all smoke good smoke? That is the burning question. South African Journal of Botany 61 275 277


Bell DT Vlahos S Watson LE 1987 Stimulation of seed germination of understorey species of the northern jarrah forest of Western Australia. Australian Journal of Botany 35 593 599


Benson D Howell J 1990 ‘Taken for granted: the bushland of Sydney and its suburbs.’ Kangaroo Press Sydney

Bond WJ van Wilgen BW 1996 ‘Fire and plants.’ Chapman and Hall London

Brown NAC 1993 Promotion of germination of fynbos seeds by plant-derived smoke. New Phytologist 123 575 583


Brown NAC Prosch DS Botha PA 1998 Plant derived smoke: an effective pretreatment for seeds of Syncarpha and Rhodocoma and potentially for many other Fynbos species. South African Journal of Botany 64 90 92


Clarke PJ Davison EA Fulloon L 2000 Germination and dormancy of grassy woodland and forest species: effects of smoke, heat, darkness and cold. Australian Journal of Botany 48 687 700
DOI

Cocks MP Stock WD 1997 Heat stimulated germination in relation to seed characteristics of fynbos legumes of the Western Cape Province, South Africa. South African Journal of Botany 63 129 132

Coutinho LM 1990 ‘Fire in the tropical biota: ecosystems processes and global challenges.’ Springer-Verlag Berlin

de Lange JH Boucher C 1990 Autecological studies on Audouinia capitata (Bruniaceae). I. Plant-derived smoke as a seed germination cue. South African Journal of Botany 56 700 703


Dixon KW Roche S Pate JS 1995 The promotive effect of smoke derived from burnt native vegetation on seed germination of Western Australian plants. Oecologia 101 185 192
DOI

Enright NJ Goldblum D Ata P Ashton DH 1997 The independent effects of heat, smoke and ash on emergence of seedlings from the soil seed bank of a heathy Eucalyptus woodland in Grampians (Gariwerd) National Park, western Victoria. Australian Journal of Ecology 22 81 88

French K Pellow B Henderon M 2000 Vegetation of the Holsworthy Military Area. Cunninghamia 6 893 940


Gillon D 1983 The fire problem in tropical savannas. In ‘Ecosystems of the World 13’. Bourliere F 617 638 Elsevier Scientific Publishing Company Amsterdam

Gilmour CA Crowden RK Koutoulis A 2000 Heat shock, smoke and darkness: partner cues in promoting seed germination in Epacris tasmanica (Epacridaceae). Australian Journal of Botany 48 603 609


Gonzalez-Rabanal F Casal M 1995 Effect of high temperatures and ash on germination of ten species from gorse shrubland. Vegetatio 116 123 131
DOI

Hanley ME Fenner M Ne’eman G 2001 Pregermination heat shock and seedling growth of fire-following Fabaceae from four Mediterranean-climate regions. Acta Oecologica 22 315 320 DOI

Hopkins B 1965 Observations on savanna burning in the Olokemeji Forest Reserve, Nigeria. Journal of Applied Ecology 2 367 381

James T McDougall L Benson D 1999 ‘Rare bushland plants of western Sydney.’ Royal Botanic Gardens Sydney

Keith DA 1997 Combined effects of heat shock, smoke and darkness on germination of Epacris Stuartii Stapf., an endangered fire-prone Australian shrub. Oecologia 112 340 344
DOI

Kenny BJ 2000 Influence of multiple fire-related germination cues on three Sydney Grevillea (Proteaceae) species. Austral Ecology 25 664 669 DOI

Lloyd MV Dixon KW Sivasithamparam K 2000 Comparative effects of different smoke treatments on germination of Australian native plants. Austral Ecology 25 610 615 DOI

Lock JM Milburn TR 1971 The seed biology of Themeda triandra Forsk. in relation to fire. In ‘The scientific management of animal and plant communities for conservation’. Duffy E Watt AS 337 351 Blackwell Scientific Publications London

Lunt ID 1994 Variation in flower production of nine grassland species with time since fire, and implications for grassland management and restoration. Pacific Conservation Biology 1 359 366

Lunt ID Morgan JW 1999 Effect of fire frequency on plant composition at the Laverton North Grassland Reserve, Victoria. Victorian Naturalist 116 84 90


McGowen I 1997 Pasture recovery after bushfires. Agfact 2 1 9


McGuinness KA 2002 Of rowing boats, ocean liners and tests of the ANOVA homogeneity of variance assumption. Austral Ecology 27 681 688
DOI

McIntyre S Lavorel S 1994 How environmental and disturbance factors influence species composition in temperate Australian grasslands. Journal of Vegetation Science 5 373 384

Miranda AC Miranda HS Oliveira IDF DeSouza BF 1993 Soil and air temperatures during prescribed cerrado fires in Central Brazil. Journal of Tropical Ecology 9 313 320


Morgan JW 1997 The effect of grassland gap size on establishment, growth and flowering of the endangered Rutidosis leptorrhynchoides (Asteraceae). Journal of Applied Ecology 34 566 576


Morgan JW 1998 a Comparative germination responses of 28 temperate grassland species. Australian Journal of Botany 46 209 219
DOI

Morgan JW 1998 b Small-scale plant dynamics in temperate Themeda triandra grasslands of southeastern Australia. Journal of Vegetation Science 9 347 360

Morris EC 2000 Germination response of seven east Australian Grevillea species (Proteaceae) to smoke, heat exposure and scarification. Australian Journal of Botany 48 179 189
DOI

Noy-Meir I 1995 Interactive effects of fire and grazing on structure and diversity of Mediterranean grasslands. Journal of Vegetation Science 6 701 710

Orr DM Paton CJ Lisle AT 1997 Using fire to manage species composition in Heteropogon contortus (black speargrass) pastures. 1. Burning regimes. Australian Journal of Agricultural Research 48 795 802
DOI

Peart MH 1979 Experiments on the biological significance of the morphology of seed-dispersal units in grasses. Journal of Ecology 67 843 863

Purdie RW 1977 Early stages of regeneration after burning in dry sclerophyll vegetation. II: Regeneration by seed germination. Australian Journal of Botany 25 35 46


Read TR Bellairs SM 1999 Smoke affects the germination of native grasses of New South Wales. Australian Journal of Botany 47 563 576
DOI

Read TR Bellairs SM Mulligan DR Lamb D 1997 Influence of smoke on soil seed bank germination in a native forest community of New South Wales. In ‘Second Australian native seed biology for revegetation workshop’. Bellairs SM Osborne JM 81 92 Australian Centre for Minesite Rehabilitation Brisbane

Read TR Bellairs SM Mulligan DR Lamb D 2000 Smoke and heat effects on soil seed bank germination for the re-establishment of a native forest community in New South Wales. Austral Ecology 25 48 57 DOI

Roche S Koch JM Dixon KW 1997 a Smoke enhanced seed germination for mine rehabilitation in the southwest of Western Australia. Restoration Ecology 5 191 203 DOI

Roche S Dixon KW Pate JS 1997 b Seed ageing and smoke: partner cues in the amelioration of seed dormancy in selected Australian native species. Australian Journal of Botany 45 783 815 DOI

Roche S Dixon KW Pate JS 1998 For everything a season: smoke-induced seed germination and seedling recruitment in a Western Australian Banksia woodland. Australian Journal of Ecology 23 111 120

Smith MA Bell DT Loneragan WA 1999 Comparative seed germination ecology of Austrostipa compressa and Ehrharta calycina (Poaceae) in a Western Australian Banksia woodland. Australian Journal of Ecology 24 35 42
DOI

Southwell CJ Jarman PJ 1987 Macropod studies at Wallaby Creek III. The effect of fire on pasture utilisation by macropodids and cattle. Australian Wildlife Research 14 117 124

Van Staden J Brown NAC Jager AK Johnson TA 2000 Smoke as a germination cue. Plant Species Biology 15 167 178
DOI

Stuwe J Parsons RF 1977 Themeda australis grasslands on the Basalt Plains, Victoria: floristics and management effects. Australian Journal of Ecology 2 467 476

Tieu A Dixon KW Sivasithamparan K Plimmer JA Sieler IM 1999 Germination of four species of native Western Australian plants using plant-derived smoke. Australian Journal of Botany 47 207 219
DOI

Tothill JC 1969 Soil temperatures and seed burial in relation to the performance of Heteropogon contortus and Themeda australis in burnt native woodland pastures in eastern Queensland. Australian Journal of Botany 17 269 275

Tremont RM 1994 Life-history attributes of plants in grazed and ungrazed grasslands on the Northern Tablelands of New South Wales. Australian Journal of Botany 42 511 530


Warcup JH 1980 Effect of heat treatment of forest soil on germination of buried seed. Australian Journal of Botany 28 567 571


Whelan RJ York J 1998 Post-fire germination of Hakea sericea and Petrophile sessilis after spring burning. Australian Journal of Botany 46 367 376
DOI

Zar JH 1999 ‘Biostatisical analysis.’ 4th Prentice Hall Englewood Cliffs, NJ



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