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Vegetation succession in savanna determined by interaction of grazing, browsing and fire; a comparison between hypotheses.
Södertörn University College, School of Life Sciences.
2005 (English)Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
Abstract [en]

Studies in tropical regions have shown that trees and grasses respond differently to fire, grazing and browsing. In African savannas, the responses to fire, grazing and browsing are different, determined by negative or positive correlations. Browsing may have other consequences than grazing because instead of increasing woody biomass it reduces it, causing increase in grass growth, leading to increase in fuel that results in more intense fires and decrease in woody biomass. Fire and herbivory are an important interactive disturbance factors affecting vegetation succession and the tree-grass dynamics in savanna environment. Several of the fire-herbivory interactions are landscape level effects, which is shown in 2 models. My hypothesis is that the tree-grass balances are determined by interactions of both grazing and fire. There have come new scientific data about fire and herbivory and the interaction effects on tree-grass dynamic and succession in the savanna. By analyzing my hypothesis through a comparison between hypotheses, Intermediate disturbance hypothesis, Janzen-Connell hypothesis and the Huston hypothesis, I propose several scenarios of the savanna tree-grass dynamics in East Africa, as a result of this comparison.

Place, publisher, year, edition, pages
Huddinge: Institutionen för kemi, biologi, geografi och miljövetenskap , 2005. , 26 p.
Keyword [en]
Fire, herbivory, interaction, tree-grass dynamics, vegetation succession
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:sh:diva-307OAI: oai:DiVA.org:sh-307DiVA: diva2:15995
Uppsok
bio-/geovetenskap
Supervisors
Examiners
Available from: 2005-08-26 Created: 2005-08-26

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fulltext(235 kB)3937 downloads
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a314c83b0ed80cbf33f61d15cccf0ff484d2cc5cf384a5d28768be7153bd932ceee409e7
Type fulltextMimetype application/pdf

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf