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Fire, plant-derived smoke and grazing effects on regeneration, productivity and diversity of the Sudanian savanna-woodland ecosystem

Dayamba, Sidzabda Djibril (2010). Fire, plant-derived smoke and grazing effects on regeneration, productivity and diversity of the Sudanian savanna-woodland ecosystem. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2010:65
ISBN 978-91-576-7510-1
[Doctoral thesis]

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Abstract

The establishment and subsequent dynamics and productivity of many plants is affected by diverse environmental factors, some of the most important in savanna ecosystems being herbivory, fire and its related cues. This thesis assessed the effects of these factors on the woody and herbaceous regeneration, productivity and diversity of Sudanian savanna-woodlands. The time (season) of fires and soil depth were found to affect both fire temperature and temperature residence time, which in turn affected the germination of seeds buried in the soil. Fairly good germination of unburied or superficially buried seeds could be obtained after early burning which is not the case of mid-season and late-season fires. Analysis of seeds’ germination responses to smoke generated by burning revealed that smoke responsiveness is a species-specific attribute that transcends plant species’ ecological characteristics, notably their fire response categories. In addition, the type and dose of smoke strongly affect germination parameters of responsive species, and for some species an appropriate combination of smoke and heat is required for maximal germination responses. Further, certain levels of heat induce temporary physiological dormancy in some species, which, in field conditions, might be beneficial in synchronizing the start of germination with the onset of rainy season. The effects of grazing and fire on the biomass dynamics of resprouts from cut stumps of selected tree species were also examined. The responses to the treatments were found to be species-specific, fire being deleterious in some cases and grazing generally having no significant effect. Finally, the time (season) of fires was found to have no significant effects on the richness, diversity, biomass or abundance of the herbaceous layer. In conclusion, grazing could be integrated in management prescriptions to promote multi-purpose uses of the forests. In addition, more attention should be paid to burning conditions to reduce fire severity as complete fire exclusion is utopian in this savanna ecosystem. Further, assuming optimal dosage levels are identified, fire-related cues (smoke and heat) could have potential uses in reforestation with native species.

Authors/Creators:Dayamba, Sidzabda Djibril
Title:Fire, plant-derived smoke and grazing effects on regeneration, productivity and diversity of the Sudanian savanna-woodland ecosystem
Year of publishing :2010
Volume:2010:65
Number of Pages:73
Papers/manuscripts:
NumberReferences
ALLI. Sidzabda Djibril Dayamba, Patrice Savadogo, Didier Zida, Louis Sawadogo, Daniel Tiveau, Per Christer Oden (2010). Fire temperature and residence time during dry season burning in a Sudanian savanna-woodland of West Africa with implication for seed germination. Journal of Forestry Research (in Press). II. Sidzabda Djibril Dayamba, Mulualem Tigabu, Louis Sawadogo, Per Christer Oden (2008). Seed germination of herbaceous and woody species of the Sudanian savanna-woodland in response to heat shock and smoke. Forest Ecology and Management 256, 462–470 III. Sidzabda Djibril Dayamba, Louis Sawadogo, Mulualem Tigabu, Patrice Savadogo, Didier Zida, Daniel Tiveau, Per Christer Oden (2010). Effects of aqueous smoke solutions and heat on seed germination of herbaceous species of the Sudanian savanna-woodland in Burkina Faso. Flora 205, 319–325. IV. Sidzabda Djibril Dayamba, Patrice Savadogo, Louis Sawadogo, Didier Zida, Daniel Tiveau, Per Christer Oden (2010). Dominant species’ resprout biomass dynamics after cutting in the Sudanian savanna-woodlands of West Africa: long-term effects of annual early fire and grazing. (Submitted manuscript). V. Sidzabda Djibril Dayamba, Patrice Savadogo, Louis Sawadogo, Didier Zida, Mulualem Tigabu, Daniel Tiveau, Per Christer Oden (2010). Community dynamics and productivity of herbaceous species in the Sudanian savanna-woodlands of Burkina Faso: short term impact of burning season. African Journal of Range and Forage Science (in Press).
Place of Publication:Alnarp
ISBN for printed version:978-91-576-7510-1
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:savannas, fires, heat, grazing, germination, regeneration, plant ecology, biodiversity, burkina faso
Keywords:Fire, smoke, heat, herbivory, germination, resprouts, biomass, diversity, Burkina Faso, West Africa
URN:NBN:urn:nbn:se:slu:epsilon-3105
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-3105
ID Code:2365
Department:(S) > Southern Swedish Forest Research Centre
Deposited By: Sidzabda Djibril Dayamba
Deposited On:12 Oct 2010 00:00
Metadata Last Modified:02 Dec 2014 10:17

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