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Effects of heat and fire on the germination of Acacia sieberiana D.C. and Acacia gerrardii Benth. in Uganda

Published online by Cambridge University Press:  10 July 2009

Patrick Mucunguzi  and
Hannington Oryem-Origa
Patrick Mucunguzi
Affiliation:
Department of Botany, Makerere University, P. O. Box 7062, Kampala, Uganda
Hannington Oryem-Origa
Affiliation:
Department of Botany, Makerere University, P. O. Box 7062, Kampala, Uganda
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Abstract

The effects of heat treatment and fire on seed germination of Acacia sieberiana D.C. and Acacia gerrardii Benth. were studied. Dry heat and fire were studied separately. Seeds treated with dry heat were set to germinate in petri-dishes under laboratory conditions. Other seeds were planted in plots at the Uganda Institute of Ecology, Mweya, which were then burnt, and subsequent seedling emergence was monitored. The effect of heat treatment on seed germination depended on heat intensity and duration of exposure. Higher intensities reduced the germination capacity of Acacia seeds. Short exposure of seeds stimulated germination but prolonged exposure rapidly reduced seed viability. A. sieberiana had a higher heat resistance than A. gerrardii. The survival and germination of seeds after fire increased with depth of burial and A. sieberiana survived better than A. gerrardii. The germinability of seeds of A. gerrardii was not significantly increased by fire.

Keywords

Acaciaburial depthfiregerminationheat
Type
Research Article
Information
Journal of Tropical Ecology , Volume 12 , Issue 1 , January 1996 , pp. 1 - 10
Copyright
Copyright © Cambridge University Press 1996

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References

LITERATURE CITED

Auld, T. D. 1986. Population dynamics of the shrub Acacia suaveolens (Sm.). Wild: dispersal and the dynamics of the soil seed-bank. Australian Journal of Ecology 11:235–254.CrossRefGoogle Scholar
Bishop, O. N. 1980. Statistics for biology. 3rd Edition.Longman. 215 pp.Google Scholar
Christensen, P. E. & Kimber, P. C. 1975. Effects of prescribed burning on the Flora and Fauna of South West Australia forests. Proceedings of the Ecological Society of Australia 9:85–106.Google Scholar
Clemens, J., Jones, P. G. & Gilbert, N. H. 1977. Effect of seed treatments on germination in Acacia. Australian Journal of Botany 25:269–276.CrossRefGoogle Scholar
Coe, M. & Coe, C. 1987. Large herbivore, Acacia trees and bruchid beetles. South African Journal of Science 83:624–635.Google Scholar
Donahaye, E., Navarro, S. & Calderon, M. 1966. Observation on the life-cycle of Caryedon gonagra (F) on its natural host in Israel, Acacia spirocarpa and A. tortilis. Tropical Science 8:85–89.Google Scholar
Fenner, M. 1985. Seed ecology. 1st Edition.Chapman & Hall, London. 151 pp.CrossRefGoogle Scholar
Halavey, C. 1974. Effect of gazelles and seed beetles (Bruchidae) on germination and establishment of Acacia species. Israeli Journal of Botany 223:120–126.Google Scholar
Harker, K. W. 1959. An Acacia weed of Uganda grasslands. Tropical Agriculture (Trinidad) 36:45–57.Google Scholar
Harrington, G. N. & Ross, I. C. 1974. The savanna ecology of Kidepo Valley National Park. The effects of burning and browsing on the vegetation. East African Wildlife Journal 12:93–105.CrossRefGoogle Scholar
Janzen, D. H. 1969. Seed eaters versus seed size, number, toxicity and dispersal. Evolution 29:1–27.Google Scholar
Janzen, D. H. 1975. Interactions of seeds and their insect predators/parasitoids in a tropical deciduous forest. In Price, P. W. (ed.). Evolutionary strategies of parasite insects and mites. Plenum, New York.Google Scholar
Jones, R. M. 1963. Preliminary studies of the germination of seed of Acacia cyclops and Acacia cynbophylla. South African Journal of Science 59:296–298.Google Scholar
Karschon, R. 1975. Seed germination of Acacia raddiana savi and A. tortilis Hayne as related to infestation by bruchids. Agricultural Research Organization Leaflet No. 52, Division of Science Publication, Israel.Google Scholar
Lamprey, H. F., Halavey, C. & Mackacha, S. 1974. Interactions between Acacia, bruchid beetles and large herbivores. East African Wildlife Journal 12:81–85.CrossRefGoogle Scholar
Lock, J. M. 1988. Vegetation studies in Queen Elizabeth National Park, Uganda. Agriculture Consulting Technical Assistance to Uganda Institute of Ecology project No. 4100.337. 42.41. 70 pp.Google Scholar
Luke, R. H. & McArthur, A. G. 1978. Bush fires in Australia. 1st Edition. Wilke & Co. Ltd, Victoria. 359 pp.Google Scholar
Mahgroub, S. & Bebawi, F. 1983. Seed dormancy rhythm of Sudanese acacias. Sudan Silva 25 (v): 108–123.Google Scholar
Moore, P. D. & Chapman, S. B. 1986. Methods in plant ecology. 2nd Edition. Blackwell Scientific Publication. 589 pp.Google Scholar
Naylor, R. E. L. 1981. An evaluation of various germination indices for predicting differences in seed vigour in Italian Ryegrass. Seed Science and Technology 9:593–600.Google Scholar
Omer, H. A. 1975. The effect of burning on the viability of five Acacia species. Sudan Silva 20(iii):20–22.Google Scholar
Peake, F. G. 1952. On a bruchid seed borer in Acacia aracica. Bulletin of Entomological Research 43:317–324.CrossRefGoogle Scholar
Pieterse, P. J. & Cairns, A. L. P. 1988. The population dynamics of the weed Acacia longiflora (Fabaceae) in the absence and presence of fire. Siud Afrikaanse Basboutydskrif 145 06.CrossRefGoogle Scholar
Portlock, C. C., Shea, S. R., Major, J. D. & Bell, D. T. 1990. Stimulation of germination of Acacia pulchella; a laboratory basis for forest management options. Journal of Applied Ecology 27:319–324.CrossRefGoogle Scholar
Sabiiti, E. N. & Wein, W. R. 1987. Fire and Acacia seeds. A hypothesis of colonization success. Journal of Ecology 75:937–946.CrossRefGoogle Scholar
Sabiiti, E. N. & Wein, W. R. 1988. Fire behaviour and the invasion of Acacia sieberiana into savanna grassland openings. African Journal of Ecology 26:301–313.CrossRefGoogle Scholar
Sabiiti, E. N., Wein, W. R. & Edroma, E. 1991. Fire browsing effects on the biology of East African Acacia species: a review. African Wildlife Research and Management 1:26–29.Google Scholar
Shea, S. R., McCormick, J. & Portlock, C. C. 1979. The effect of fires on regeneration of leguminous species in the Northern Jarrah (Eucalyptus marginata Sm) forest of Western Australia. Australian Journal of Ecology 4:195–205.CrossRefGoogle Scholar